RFQ Today
Submit your JIS standard, grade, product form, dimensions, and quantity for a competitive, fully certified quotation within 24 hours. EN 10204 3.1 / 3.2 material certificates, JIS mill test certificates, and Third-Party Inspection documentation are available on all project-grade JIS supply.
JIS
Standard
Steel Grades
A world-class technical reference for EPC engineers, procurement heads, materials engineers, and TPI inspection agencies working with Japanese Industrial Standards (JIS) — covering the JIS standards system structure, the most important JIS steel pipe, fitting, flange, and material grades for process piping and pressure equipment, the complete JIS-to-ASTM and JIS-to-EN cross-reference for international project procurement, JIS pressure rating classes, and the documentation and certification requirements for JIS-specified EPC project material supply.
Structure, Authority
& Global EPC Role
Japanese Industrial Standards (JIS) are the national standards of Japan, published by the Japanese Standards Association (JSA) under the authority of the Japanese Industrial Standards Committee (JISC). Understanding how JIS fits alongside ASTM, EN, and ISO is essential for international EPC project procurement involving Japanese plant, LNG facilities, or Japanese EPCs.
1.1 — What is JIS Standard Steel Grades and Why It Matters to EPC Engineers
The Japanese Industrial Standards (JIS) system — maintained by the Japanese Standards Association (JSA) under the Japanese Industrial Standardization Act — is one of the world’s five major national standards bodies alongside ASTM (USA), EN/DIN (Europe), BS (UK), and GB (China). JIS standards govern the composition, dimensions, mechanical properties, testing, and inspection of virtually all manufactured goods in Japan — including the full range of steel pipe, fittings, flanges, valves, and pressure equipment used in Japanese process plant construction.
JIS materials are directly relevant to international EPC projects in four scenarios: (1) Projects engineered by Japanese EPCs (JGC, Toyo Engineering, Chiyoda, Yokogawa) that issue piping material requisitions citing JIS standards; (2) LNG liquefaction and regasification plant projects where Japanese EPC and Japanese plant operators are heavily involved; (3) Projects where Japanese-manufactured process equipment (pumps, compressors, heat exchangers, vessels) is supplied with JIS-standard nozzle flanges that must be mated to non-JIS piping; and (4) International buyers sourcing steel products from Japanese mills (Nippon Steel, JFE Steel, Kobe Steel) whose mill test certificates and product markings reference JIS standards.
1.2 — JIS Designation System
JIS designations follow the format: JIS [Division Letter][Four-digit number]. The division letter indicates the industrial sector; for steel and metallic materials the relevant divisions are:
G = Iron and Steel (JIS G-series: raw materials, pipe, tube, bar, plate, fittings).
B = General Machinery (JIS B-series: flanges, valves, pipe fittings, fasteners, hydraulic components).
H = Non-Ferrous Metals and Metallurgy (aluminium, copper, titanium alloys).
K = Chemical Industry (seals, gaskets, chemical-resistant materials).
Z = General (documentation, quality management — JIS Q 9001 = ISO 9001 Japanese edition).
Within the G-series: G3xxx = Structural and pressure pipe/tube; G4xxx = Steel bar, wire, and plate grades. Within the B-series: B2xxx = Pipe flanges and fittings; B8xxx = Pressure vessels and hydraulic equipment.
1.3 — JIS vs ASTM vs EN: Framework Comparison
| Aspect | JIS (Japan) | ASTM (USA) | EN (Europe) | Practical Impact for EPC |
|---|---|---|---|---|
| Governing body | JSA / JISC | ASTM International | CEN (European Committee) | All three are equal-authority national/regional standards |
| Pipe dimensions basis | Nominal bore (A-series mm; B-series inches) | NPS (nominal pipe size, inches) | DN (nominal diameter, mm) | JIS A-series DN ≈ EN DN; JIS B-series ≈ ASTM NPS |
| Pressure classes (flanges) | 5K / 10K / 16K / 20K / 30K / 40K / 63K (kgf/cm²) | Class 150 / 300 / 600 / 900 / 1500 / 2500 (psi) | PN 6 / 10 / 16 / 25 / 40 / 63 / 100 (bar) | JIS 10K ≈ ASME Class 150; JIS 20K ≈ ASME Class 300 |
| Material cert format | JIS mill certificate (or EN 10204 for export) | ASTM mill test report (MTR) | EN 10204 3.1 / 3.2 | Specify EN 10204 3.1 for all EPC export supply from Japan |
| Flange face types | Flat face (FF) standard in JIS; RF available | Raised face (RF) standard in ASME B16.5 | Raised face (RF) standard in EN 1092-1 | JIS flat-face flanges must not be bolted to ASME RF flanges without adapter rings |
| Pipe schedule notation | Schedule (Sch) — same as ASTM | Schedule (Sch) — ASME B36.10M | Wall thickness series (S1, S2, S3) or mm | JIS B-series pipe uses same schedule designations as ASTM |
1.4 — Critical Interoperability Issue: JIS Flange Facing
Submit your JIS standard, grade, product form, dimensions, and quantity for a documented RFQ within 24 hours.
Standards, Grades
& ASTM / EN Equivalents
The most frequently encountered JIS steel standards in international EPC procurement cover carbon steel pipe, stainless steel pipe, alloy steel pipe, flanges, butt-weld fittings, and bar stock — all cross-referenced here to their ASTM and EN equivalents. All supported grades are available from RR Hydraulic with full documentation.
Submit JIS standard, grade, product form, dimensions, and quantity to sales@rrhydraulics.com for a certified offer.
2.1 — Carbon Steel Pipe: JIS G-Series Standards
JIS G3454 — Carbon Steel Pipe for Pressure Service
The primary JIS standard for carbon steel seamless and electric-resistance-welded (ERW) pipe for general pressure service at moderate temperatures — the JIS direct equivalent of ASTM A53 / A106. Grades: STPG370 (min UTS 370 MPa; yield 215 MPa) and STPG410 (min UTS 410 MPa; yield 245 MPa). “STP” = Steel Tube for Pressure; “G” = General. Dimensions per JIS B2301 and B2302 (schedule series, both A-series DN and B-series NPS available). Temperature service range: −15°C to +350°C (STPG370/410). Most widely specified JIS carbon steel pipe standard on Japanese domestic EPC projects — equivalent to ASTM A106 Gr.A (STPG370) and ASTM A106 Gr.B (STPG410) in composition and mechanical property requirements. Normalising required for pipe with wall thickness above 20 mm. JIS mill test certificate required; EN 10204 3.1 on request for export.
JIS G3456 — Carbon Steel Pipe for High-Temperature Service
Carbon steel seamless pipe specifically qualified for elevated-temperature service in steam, hot water, and high-temperature process piping — the JIS equivalent of ASTM A106 Gr.B for high-temperature application. Grade STPT370 (UTS ≥ 370 MPa; yield ≥ 215 MPa) and STPT410 (UTS ≥ 410 MPa; yield ≥ 245 MPa). “STPT” = Steel Tube for Pressure at elevated Temperature. The key distinction from G3454 is the controlled chemical composition for high-temperature service (C ≤ 0.25% for STPT410; Mn 0.30–0.80%) that maintains creep resistance at temperatures up to 450°C without the creep-strength alloying required for Cr-Mo grades (G3458/G3462). Used for: high-pressure steam distribution piping; hot oil service piping; and all carbon steel piping in Japanese plants operating in the 350–450°C temperature range.
JIS G3457 — Arc-Welded Carbon Steel Pipe
Large-diameter arc-welded (SAWL or SAWH — submerged arc welded, longitudinal or helical seam) carbon steel pipe for low-pressure piping and structural applications — the JIS equivalent of ASTM A53 Type E or API 5L for large-diameter process piping. Grade STPY400 (UTS ≥ 400 MPa; yield ≥ 235 MPa). Used for: large-diameter process gas headers (600 mm to 1500 mm OD) in petrochemical plants; structural columns and piles; large-bore low-pressure water and air distribution mains in Japanese plant construction. G3457 STPY400 is accepted as a process piping material for ASME B31.3 non-critical fluid service (Category D) with appropriate cross-reference documentation — not accepted as a substitute for G3454 / G3456 in high-pressure coded piping without engineering review.
JIS G3458 — Alloy Steel Pipe (Cr-Mo)
Seamless alloy steel pipe for elevated-temperature and high-pressure service — the JIS equivalent of ASTM A335 for Cr-Mo alloy steel pipe. Key grades: STPA12 (½Mo, equivalent A335 P1); STPA22 (1¼Cr-½Mo, equivalent A335 P11); STPA23 (2¼Cr-1Mo, equivalent A335 P22); STPA24 (5Cr-½Mo, equivalent A335 P5); STPA25 (9Cr-1Mo, equivalent A335 P9). “STPA” = Steel Tube for Pressure, Alloy. Grade STPA23 (2¼Cr-1Mo) is the most important G3458 grade for Japanese refinery and petrochemical high-temperature process piping — direct substitute for A335 P22 with matching composition, heat treatment, and mechanical property requirements. Preheat and PWHT requirements for G3458 grades mirror the ASME IX P-Number requirements for the equivalent ASTM grades.
JIS G3459 — Stainless Steel Pipe
Seamless and welded austenitic stainless steel pipe for general corrosive and high-temperature service — the JIS equivalent of ASTM A312. Covers all common JIS stainless grades in pipe form. Key grades: SUS304TP (≡ ASTM TP304); SUS304LTP (≡ ASTM TP304L); SUS316TP (≡ ASTM TP316); SUS316LTP (≡ ASTM TP316L); SUS321TP (≡ ASTM TP321); SUS347TP (≡ ASTM TP347). “SUS” = Steel Use Stainless (Japanese stainless designation system). Solution-annealed condition standard for all grades. SUS316LTP is the dominant grade on Japanese EPC offshore and chemical plant projects — direct chemical composition and property equivalent to ASTM A312 TP316L. JIS mill test certificate for domestic supply; EN 10204 3.1 for export EPC supply — both cite the same composition and mechanical property limits.
JIS G3462 — Alloy Steel Tube for Boiler and Heat Exchanger
Seamless alloy steel tube for boiler superheater, reheater, economiser, and heat exchanger service — the JIS equivalent of ASTM A213 for ferritic alloy tube. Key grades: STBA12 (½Mo); STBA22 (1¼Cr-½Mo, equivalent A213 T11); STBA23 (2¼Cr-1Mo, equivalent A213 T22); STBA24 (5Cr-½Mo, equivalent A213 T5); STBA28 (9Cr-2Mo, similar to A213 T9). “STBA” = Steel Tube for Boiler Alloy. G3462 STBA23 (2¼Cr-1Mo) heat exchanger tube is the JIS standard specified on Japanese refinery and petrochemical heat exchanger designs — direct substitute for ASTM A213 T22 with identical composition and heat treatment requirements. All G3462 tubes require hydrostatic test per JIS standard; eddy-current NDE is an accepted alternative for small OD grades.
2.2 — JIS Pipe Grade Cross-Reference: JIS to ASTM to EN
| JIS Standard + Grade | ASTM Equivalent | EN Equivalent | P-No. (ASME IX) | Application |
|---|---|---|---|---|
| G3454 STPG370 | A53 Gr.A / A106 Gr.A | EN 10216-1 P235GH | 1 | General pressure pipe; low-moderate temp |
| G3454 STPG410 | A106 Gr.B | EN 10216-1 P265GH | 1 | General pressure pipe; standard EPC CS pipe |
| G3456 STPT370 | A106 Gr.A (HT qualified) | EN 10216-2 P235GH | 1 | High-temp steam; hot oil; 350–450°C |
| G3456 STPT410 | A106 Gr.B (HT qualified) | EN 10216-2 P265GH | 1 | High-temp carbon steel; standard Japanese steam pipe |
| G3458 STPA22 | A335 P11 | EN 10216-2 13CrMo4-5 | 4 | 1¼Cr-½Mo alloy pipe; steam up to 593°C |
| G3458 STPA23 | A335 P22 | EN 10216-2 10CrMo9-10 | 5A | 2¼Cr-1Mo alloy pipe; high-temp refinery / reformer |
| G3459 SUS304TP | A312 TP304 | EN 10216-5 1.4301 | 8 Gr.1 | General SS pipe; chemical; food; cryogenic |
| G3459 SUS316LTP | A312 TP316L | EN 10216-5 1.4404 | 8 Gr.1 | Corrosive / NACE; offshore; marine SS pipe |
| G3459 SUS321TP | A312 TP321 | EN 10216-5 1.4541 | 8 Gr.2 | High-temp Ti-stabilised SS; exhaust; furnace |
| G3462 STBA23 | A213 T22 | EN 10216-2 10CrMo9-10 | 5A | 2¼Cr-1Mo HX tube; high-temp heat exchanger |
2.3 — JIS B2220 Flanges and Pressure Classes
JIS 5K = 5 kgf/cm² ≈ 0.49 MPa max test pressure — low-pressure utility (water, steam condensate)
JIS 10K = 10 kgf/cm² ≈ 0.98 MPa max rating — most common JIS class; comparable to ASME Class 150#
JIS 16K = 16 kgf/cm² ≈ 1.57 MPa — intermediate class; used in Japanese utility and HVAC piping
JIS 20K = 20 kgf/cm² ≈ 1.96 MPa — comparable to ASME Class 300#; medium-pressure process
JIS 30K = 30 kgf/cm² ≈ 2.94 MPa — comparable to ASME Class 400#; high-pressure steam
JIS 40K = 40 kgf/cm² ≈ 3.92 MPa — comparable to ASME Class 600#; high-pressure process
JIS 63K = 63 kgf/cm² ≈ 6.18 MPa — comparable to ASME Class 900#; very high pressure
Note: JIS pressure ratings are nominal cold working pressures and vary with temperature in the same way as ASME B16.5 pressure-temperature tables. Always verify the actual working pressure rating of the specific JIS flange class at the design temperature from JIS B2220 Table 1 — do not use the cold nominal rating for elevated-temperature service without de-rating.
JIS 10K flange: WN (weld neck), SUS316L, flat face, JIS B2220 dimensions, 150A (6″ DN).
ASME Class 150# piping: WN, SS 316L, raised face, ASME B16.5, 6″ NPS.
Issues: (1) Flat face vs raised face — use full-face spiral-wound gasket (SS316L+PTFE fill); (2) Bolt circle: JIS 10K 150A = 210 mm PCD, 8 × M20; ASME 150# 6″ = 266.7 mm PCD, 8 × ⅞” — not interchangeable; use a JIS-10K-to-ASME-150# adapter spool per the Japanese EPC piping specification for nozzle connections.
2.4 — JIS Flange and Fitting Standards
JIS B2220 — Steel Pipe Flanges
The central JIS flange standard — covers steel pipe flanges in all pressure classes (5K through 63K), all facing types (flat face FF, raised face RF, ring type joint RTJ, tongue and groove TG, and male/female MF), and all connection types (weld neck WN, slip-on SO, blind BL, socket weld SW, threaded, and lap joint). Materials: carbon steel (A, B, C, D material groups); stainless steel (SUS304, SUS316, SUS316L, SUS321). JIS B2220 flanges are dimensioned with the Japanese “A-series” nominal bore in mm (25A = DN25; 150A = DN150) as standard — “B-series” flanges use nominal pipe sizes in inches identical to ASME B16.5. Bolt holes: JIS flanges use M-series metric bolts (M16, M20, M24) — not the inch-series bolts used in ASME B16.5 flanges, which is a critical interoperability factor for JIS-to-ASME bolted connections.
JIS B2311 — Carbon Steel Butt-Welding Fittings (Small Bore)
Butt-welding fittings for nominal bore 15A (½”) through 50A (2″) — elbows (90° and 45°), tees (equal and reducing), reducers (concentric and eccentric), caps, and return bends in carbon steel (STS370/STS410) and stainless steel (SUS304, SUS316, SUS316L). Dimensional tolerances and wall thickness are tighter than JIS B2312 (large bore) — centre-to-face dimensions and OD tolerances per JIS B2311 Table 1. The JIS B-series equivalent of ASME B16.11 socket-weld and threaded fittings (but in butt-weld configuration). Used on Japanese LNG plant small-bore instrument and sample piping and all small-bore process piping specified to JIS B-series dimensions.
JIS B2312 — Carbon Steel Butt-Welding Fittings (Large Bore)
Butt-welding pipe fittings for nominal bore 65A (2½”) through 600A (24″) — the JIS large-bore equivalent of ASTM A234 butt-weld fittings per ASME B16.9. Covers elbows, tees, reducers, caps, and crosses in carbon steel (STS370 / STS410 matching G3454 pipe grades) and alloy steel (equivalent to ASTM A234 WP11, WP22 for G3458 pipe service). Dimensions per JIS B2312 centre-to-face tables — similar but not identical to ASME B16.9 dimensions; centre-to-face lengths can differ by 5–10 mm from ASME B16.9 in the same nominal size, affecting dimensional piping isometric calculations on projects mixing JIS and ASME fittings. Verify the applicable fitting dimension standard (JIS B2312 or ASME B16.9) at the project specification level to avoid isometric drafting and prefabrication errors.
JIS B2313 — Stainless Steel Butt-Welding Fittings
Butt-welding pipe fittings in stainless steel for process piping service — the JIS equivalent of ASTM A403 stainless butt-weld fittings per ASME B16.9. Covers SUS304, SUS304L, SUS316, SUS316L, SUS321, SUS347 in all fitting types from 15A through 600A. Solution-annealed condition standard (mandatory for SUS316L to maintain corrosion resistance and NACE compliance). JIS B2313 SUS316L fittings are the dominant SS fitting specification on Japanese EPC chemical plant and offshore piping — direct chemical and mechanical equivalent to ASTM A403 WP316L with the same composition limits (C ≤ 0.03%, Cr 16–18%, Ni 10–14%, Mo 2–3%) and heat treatment requirement. EN 10204 3.1 material certificate available from Japanese mills on export-project supply.
JIS B2301 / B2302 — Threaded and Socket-Weld Fittings
JIS B2301 covers screwed (threaded, NPT-equivalent JIS taper thread R per JIS B0203) and socket-weld fittings in carbon steel and SS for small-bore piping (6A through 50A) — the JIS equivalent of ASME B16.11. JIS B2302 covers larger socket-weld and threaded fittings. JIS taper thread (R thread) is equivalent to BSP tapered (BSPT / Rc thread per ISO 7-1) — NOT compatible with NPT (ASME B1.20.1) without thread-to-thread conversion, as R/Rc thread has a different taper angle (1:16 same as NPT) but different thread form (Whitworth 55° thread profile vs NPT 60° Unified thread profile). Confirm thread form (JIS R / Rc vs NPT vs BSP) on all threaded fitting procurement documents for Japanese EPC projects.
JIS B2240 / B2241 — Copper Alloy Flanges and Fittings
JIS B2240 (copper alloy flanges, 5K and 10K) and JIS B2241 (copper alloy pipe fittings) cover bronze and brass flanged and threaded fittings for water, instrument air, cooling water, and low-pressure gas service in Japanese industrial plant. Copper alloy JIS flanges (5K and 10K) are widely used in Japanese industrial cooling water systems where the mild corrosion resistance of bronze is adequate and where the lower cost vs stainless steel is advantageous. For EPC projects: verify that JIS B2240 copper alloy flanges on Japanese cooling water systems are compatible with the plant water chemistry — dezincification of brass JIS fittings in low-Zn or chlorinated water systems is a documented failure mode that requires inhibited admiralty brass (JIS C3771) or cupronickel (JIS H3300 C7060) as an upgrade.
2.5 — JIS Steel Bar and Plate Grades
| JIS Standard + Grade | AISI / ASTM Equivalent | UNS | UTS (min, MPa) | Application |
|---|---|---|---|---|
| G4051 S45C | AISI 1045 | G10450 | 569 | Medium carbon bar; shafts; gears; machined parts |
| G4051 S35C | AISI 1035 | G10350 | 520 | General medium-carbon bar; fasteners; pins |
| G4053 SCM440 | AISI 4140 (Cr-Mo) | G41400 | 930 (Q+T) | High-strength Cr-Mo bar; stud bolts; heavy shafts |
| G4053 SCM415 | AISI 4115 (Cr-Mo) | G41150 | 830 (Q+T) | Case-hardening Cr-Mo bar; gears; camshafts |
| G4053 SNCM439 | AISI 4340 (Ni-Cr-Mo) | G43400 | 1030 (Q+T) | High-strength Ni-Cr-Mo bar; large shafts; heavy structural |
| G4303 SUS316L | ASTM A276 Type 316L | S31603 | 480 | SS 316L bar; machined valve bodies; fittings; shafts |
| G4303 SUS304 | ASTM A276 Type 304 | S30400 | 520 | General SS bar; machined components; food equipment |
| G4311 SUH309 | ASTM A276 Type 309 | S30900 | 520 | Heat-resistant SS; furnace components; high-temp valves |
Interoperability
& Procurement Practices
International EPC projects frequently require substitution of JIS-specified materials with ASTM or EN equivalents — or mixing JIS and non-JIS components in the same piping system. This section covers the engineering rules, common pitfalls, and procurement best practices for JIS-involved project supply. RR Hydraulic provides cross-standard advisory on JIS material substitutions.
3.1 — JIS-to-ASTM Material Substitution Rules
Material substitution from JIS to ASTM (or vice versa) is accepted on international EPC projects provided: (1) the substitute material meets or exceeds the minimum UTS, yield strength, elongation, and impact energy requirements of the JIS grade; (2) the chemical composition of the substitute falls within the applicable ASME IX P-Number group for the JIS grade’s welding qualification; (3) the heat treatment condition is equivalent; and (4) the substitution is documented on a material deviation / concession request approved by the project materials engineer and the applicable inspection authority. The following JIS-to-ASTM substitutions are routinely accepted on internationally-coded EPC projects without formal concession (they are composition and property equivalents):
| JIS Specified Grade | ASTM Substitute | P-No. | Equivalence Basis | Documentation Required |
|---|---|---|---|---|
| G3454 STPG410 | ASTM A106 Gr.B | 1 | Identical composition and property limits | MR deviation noting substitution; EN 10204 3.1 on A106 |
| G3456 STPT410 | ASTM A106 Gr.B | 1 | Equivalent composition; A106 Gr.B normalised | Confirm A106 normalised condition; project engineer approval |
| G3458 STPA22 | ASTM A335 P11 | 4 | 1¼Cr-½Mo — identical composition and P-Number | Standard substitution; no concession required on most Japanese EPC projects |
| G3458 STPA23 | ASTM A335 P22 | 5A | 2¼Cr-1Mo — identical composition and P-Number | Standard substitution; document on MR cross-reference |
| G3459 SUS316LTP | ASTM A312 TP316L | 8 Gr.1 | Identical composition (C ≤ 0.03%, Cr/Ni/Mo same) | Standard substitution; EN 10204 3.1 citing TP316L; NACE hardness |
| G3462 STBA23 | ASTM A213 T22 | 5A | 2¼Cr-1Mo HX tube — identical composition | Standard substitution; document on heat exchanger MR |
| G4303 SUS316L | ASTM A276 Type 316L | 8 Gr.1 | Identical composition; solution annealed | Standard substitution for machined bar components |
| G4053 SCM440 | ASTM A434 Grade BD (4140 Q+T) | 4 | Equivalent Cr-Mo composition; Q+T condition | Confirm hardness and UTS equivalence on MTC; engineer approval |
3.2 — JIS Stainless Designation System (SUS)
The JIS stainless steel designation system uses “SUS” (Steel Use Stainless) followed by a three-digit number that directly mirrors the AISI three-digit stainless grade number — making JIS-to-AISI stainless cross-reference straightforward for the major grades. The full JIS designation for a pipe product adds a suffix indicating the product form: “TP” for tube/pipe (e.g., SUS316LTP), “TB” for boiler tube (SUS316LTB), and no suffix for bar and plate grades (SUS316L).
| JIS Grade | AISI Grade | UNS | EN Number | C max (%) | Key Properties / Notes |
|---|---|---|---|---|---|
| SUS304 | 304 | S30400 | 1.4301 | 0.08 | General austenitic SS; most common worldwide |
| SUS304L | 304L | S30403 | 1.4307 | 0.03 | Low-C; weldable; food; cryogenic |
| SUS316 | 316 | S31600 | 1.4401 | 0.08 | Mo-bearing; chemical; marine |
| SUS316L | 316L | S31603 | 1.4404 | 0.03 | Primary NACE sour service SS; offshore dominant |
| SUS321 | 321 | S32100 | 1.4541 | 0.08 | Ti-stabilised; high-temp; exhaust; furnace |
| SUS347 | 347 | S34700 | 1.4550 | 0.08 | Nb-stabilised; nuclear steam; high-temp |
| SUS310S | 310S | S31008 | 1.4845 | 0.08 | 25Cr-20Ni; high-temp oxidation resistance |
| SUS317L | 317L | S31703 | 1.4438 | 0.03 | High-Mo (3–4%); improved pitting resistance vs 316L |
| SUS329J1 | — | S32900 | — | 0.08 | Duplex; partial JIS equivalent to 2205; Japanese domestic use |
| SUS329J3L | — | S31803 | 1.4462 | 0.03 | Duplex 2205 equivalent; NACE compliant; offshore |
3.3 — Common JIS Procurement Pitfalls for International EPC Projects
- JIS A-series vs B-series pipe dimension confusion: JIS pipe is available in two series — A-series (metric nominal bore, mm: 15A, 25A, 50A, 100A, 150A, 200A) and B-series (inch nominal bore: ½B, 1B, 2B, 4B, 6B, 8B). A-series 150A ≠ B-series 6B in OD and schedule thickness. Always confirm which series is specified in the project piping specification before ordering JIS flanges, fittings, or spools — mixing A-series and B-series components of the same nominal bore results in mismatched ODs and bolt patterns
- JIS flange bolt pattern vs ASME bolt pattern: JIS B2220 flanges use a different number of bolts and a different bolt circle diameter (PCD) than ASME B16.5 flanges for the same nominal bore and pressure class — they are not interchangeable. A JIS 10K 100A (4″) flange has 8 × M16 bolts on 175 mm PCD; ASME Class 150# 4″ flange has 8 × ⅝” bolts on 190.5 mm PCD. Do not attempt to bolt JIS flanges directly to ASME flanges using adaptor bolts — use a fabricated spool with JIS flange on one end and ASME flange on the other end at all JIS-to-ASME flange junctions
- JIS G3459 vs ASTM A312 wall thickness for same schedule: JIS G3459 stainless steel pipe may be supplied to JIS A-series wall thickness schedules that differ from ASME B36.19M — always verify that JIS-specified SS pipe wall thickness equals or exceeds the minimum required wall from the ASME B31.3 design calculation before accepting JIS pipe as an ASTM A312 substitute on ASME-designed piping systems
- JIS mill certificates vs EN 10204 3.1: Japanese domestic JIS mill certificates (ミルシート, mirushīto) are the JIS equivalent of material test certificates — they contain the same chemical and mechanical test information but do not use the EN 10204 format. For international EPC projects explicitly requiring EN 10204 3.1 certification: specify this requirement on the procurement document to the Japanese mill or trading house; Japanese mills routinely issue EN 10204 3.1-formatted certificates for export supply upon request
- JIS thread form (R/Rc) vs NPT vs BSP: JIS taper pipe threads (R thread per JIS B0203) have the same 1:16 taper as NPT but use the Whitworth 55° thread form — not the 60° Unified thread form of NPT. R and NPT threads will engage (same taper) but the 5° difference in flank angle means they do not seal reliably and the thread flanks bear on only one side of each thread. Do not attempt to seal R threads into NPT ports or vice versa without an appropriate thread adapter. Verify the thread form designation on all JIS threaded fitting procurement documents
- JIS pressure class temperature de-rating: JIS B2220 pressure class ratings (5K, 10K, 16K etc.) are cold-working-pressure ratings. At elevated temperature, the allowable pressure decreases — exactly as with ASME B16.5 pressure-temperature tables. At 400°C, a JIS 20K carbon steel flange may be de-rated to an effective 10K equivalent working pressure. Always consult JIS B2220 Table 1 pressure-temperature allowables before designing JIS-flanged connections for elevated-temperature service
Material Certification
& Export Documentation
RR Hydraulic maintains full traceability from certified JIS mill heat to final inspected and packed product shipment — chemical analysis, mechanical testing, PMI, dimensional inspection, hydrostatic NDE, and complete EN 10204 3.1 / 3.2 export documentation are standard on all JIS project-grade supply.
4.1 — Inspection & QC Protocol
4.2 — JIS Material Certification and EN 10204 for Export
| Certificate | Format / Authority | EPC Requirement | When Specified |
|---|---|---|---|
| JIS Mill Certificate (ミルシート) | Japanese mill; JIS format | Acceptable for Japanese domestic projects | Japanese domestic EPC; reference document for cross-standard substitution |
| EN 10204 2.2 | Manufacturer declaration — no specific test values | Not acceptable for EPC pressure pipe or fittings | Never for coded piping or pressure equipment |
| EN 10204 3.1 | Heat-traceable full chem + mech; manufacturer inspector | Mandatory — all international EPC JIS supply | All JIS-specified pipe, fittings, flanges, and bar on international EPC |
| EN 10204 3.2 | 3.1 + TPI countersign (DNV / Lloyds / JIA / BV) | Offshore NACE; nuclear; LNG safety-critical | LNG plant; offshore JIS-specified sour service; nuclear NSSS |
4.3 — Applications by Industry
LNG Plant Piping (JGC / Chiyoda EPC)
JGC Corporation, Chiyoda Corporation, and Toyo Engineering are among the world’s leading LNG EPC contractors — they routinely specify JIS materials in their piping material specifications (PMS) and material requisitions. JIS G3459 SUS304LTP (ASTM A312 TP304L equivalent) is the standard cryogenic LNG piping material on JGC-engineered LNG liquefaction trains — SUS304LTP provides the low-temperature toughness (austenitic SS remains ductile at −162°C LNG temperature), weldability, and corrosion resistance required for cryogenic piping service. International procurement for JGC/Chiyoda LNG projects: JIS-specified materials are routinely substituted with ASTM or EN equivalents on non-Japanese supply packages, with EN 10204 3.1 certification and a cross-reference table submitted with each MR package. RR Hydraulic supports JIS-to-ASTM cross-reference documentation for LNG project material supply packages.
Japanese Equipment Nozzle Flange Matching
Japanese-manufactured process equipment (pumps, compressors, heat exchangers, pressure vessels, reactors) is frequently supplied to international EPC projects with JIS B2220 nozzle flanges — even on projects where the piping specification is ASME B31.3 with ASME B16.5 flanges. The JIS nozzle flange-to-ASME piping connection requires a purpose-fabricated transition spool: JIS B2220 weld neck flange (matching the equipment nozzle facing, bolt pattern, and bore) on one end, and ASME B16.5 weld neck flange (matching the piping class) on the other end, with the OD transition achieved in the spool barrel. RR Hydraulic fabricates and supplies JIS-to-ASME transition spools with EN 10204 3.1 certification, dimensional report, hydrostatic test, PMI, and JIS/ASME dual-marking for full traceability on international EPC projects.
Japanese Refinery and Petrochemical Plant
Japanese domestic refineries (ENEOS, Idemitsu, Cosmo Energy) and petrochemical plants (Mitsubishi Chemical, Mitsui Chemicals, Toray) are entirely designed and maintained to JIS standards — all piping, vessels, heat exchangers, and valves are specified to JIS G and B-series standards. Maintenance and revamp projects on Japanese domestic plant must supply JIS-standard replacement materials — ASTM or EN materials require formal concession documents (変更申請, henkō shinsei) approved by the plant owner’s engineering department and the applicable inspection body (usually Kikaihoken — Boiler and Pressure Vessel inspection authority in Japan). RR Hydraulic supplies JIS-certified materials with full JIS mill certificate documentation for Japanese domestic maintenance and revamp project supply.
High-Temperature Alloy Steel Piping (G3458 STPA23)
JIS G3458 STPA23 (2¼Cr-1Mo, direct equivalent of ASTM A335 P22) is the JIS standard for high-temperature alloy steel seamless pipe in Japanese refineries, chemical plants, and power generation facilities operating between 450°C and 650°C — the exact same service conditions as ASTM A335 P22 in non-Japanese plant. Supply requirements are identical: full chemical analysis with Cr (1.9–2.6%) and Mo (0.87–1.13%) confirmation; mechanical test per heat; normalised-and-tempered condition; preheat 250°C minimum for welding; PWHT at 690–760°C after welding; and P-No. 5A ASME IX welding procedure qualification. For cross-standard projects: G3458 STPA23 mill certificate may be supplemented with an EN 10204 3.1 formatted certificate by the Japanese mill or trading house to satisfy international EPC documentation requirements.
Japanese Hydraulic Equipment Standards (JIS B Series)
JIS B-series standards govern Japanese hydraulic and pneumatic equipment — JIS B8341 (hydraulic cylinders), JIS B8342 (hydraulic power units), JIS B8351 (hydraulic control valves), JIS B8353 (hydraulic hose assemblies), and JIS B8370 (hydraulic system general rules). Japanese hydraulic system manufacturers (Daikin, Yuken, Nachi, Kayaba/KYB) design to JIS B hydraulic standards; their catalogue specifications cite JIS pressure classes and JIS port thread forms. For international hydraulic system integration with Japanese-made hydraulic components: verify port thread forms (JIS R metric tapered vs NPT vs BSP), hydraulic port connection face dimensions (JIS B2351 4-bolt square flange vs SAE J518 4-bolt flange — similar but not identical in bolt pattern and port dimensions), and fluid compatibility with the JIS hydraulic component manufacturer’s specifications.
Nuclear Plant JIS Supply (JIS Z 4201 / METI Approval)
Japanese nuclear power plant construction and maintenance is governed by the Nuclear Regulation Authority (NRA) and the Ministry of Economy, Trade and Industry (METI) — material supply for nuclear safety class components must be certified to JIS Z4201 (nuclear quality assurance programme requirements) and approved by METI’s registered inspection body. JIS material supply for Japanese nuclear plant is one of the most stringent quality regimes globally — equivalent to ASME NCA-3800 / Section III Class 1/2/3 construction in regulatory rigour. Non-Japanese suppliers must obtain METI registered equipment manufacturer qualification (登録製造者, tōroku seizōsha) or supply through a METI-registered trading intermediary to provide material to Japanese nuclear plant. RR Hydraulic advises on the supply chain pathway for JIS nuclear material requirements on international nuclear EPC projects involving Japanese partners.
4.4 — Complete EPC Project Documentation Package for JIS Supply
| # | Document | Standard / Format | Mandatory / Conditional | Notes |
|---|---|---|---|---|
| 01 | Material Test Certificate (MTC) | EN 10204 3.1 / 3.2 (or JIS mill cert for domestic) | Mandatory — all international EPC JIS supply | Heat-traceable; JIS grade designation and ASTM equivalent cited |
| 02 | Chemical Composition Report | JIS G-series limits (and ASTM equivalent limits for substitution) | Mandatory | All specified elements; C content for SUS316L NACE compliance |
| 03 | Mechanical Properties Report | JIS Z2241 tensile / Z2242 Charpy | Mandatory | UTS, yield, elongation; Charpy at min design temp for low-temp grades |
| 04 | Dimensional Inspection Report | JIS B2301 / B2302 tolerances; JIS B2220 for flanges | Mandatory | OD, wall, length; flange bolt circle, face OD; A-series or B-series confirmed |
| 05 | Hydrostatic Test Certificate | JIS G3454 / G3459 formula; JIS B2003 (flanges) | Mandatory — all pipe, tube, and flanges | Every pipe length; test pressure, hold time, pass/fail |
| 06 | PMI Report (XRF) | 100% — stainless and alloy steel lots | Mandatory — all non-CS lots | SUS316L vs SUS304L; G3458 STPA22 vs STPA23 |
| 07 | Hardness Test Report | JIS Z2244 (HV) / Z2243 (HB); ≤ 22 HRC for NACE SS | Mandatory — NACE sour service SUS316L / Duplex lots | Per piece for NACE lots; per lot standard |
| 08 | Ferrite Count Report (Duplex) | JIS G0555 / ASTM E562 metallographic | Mandatory — SUS329J3L Duplex supply | 40–60% ferrite; photomicrograph on certificate |
| 09 | JIS-to-ASTM Cross-Reference Table | Project-specific concession / substitution document | Mandatory — JIS-to-ASTM substitution supply | Composition and property comparison; project engineer approval |
| 10 | NACE Compliance Statement | NACE MR0175 / ISO 15156-3 declaration | Conditional — NACE sour service JIS supply | SUS316L ≤ 22 HRC; SUS329J3L ≤ 28 HRC; grade and condition stated |
| 11 | Flange Facing Confirmation | JIS B2220 — FF or RF stated on certificate | Mandatory — all JIS flange supply for mixed-standard systems | Prevents JIS FF / ASME RF mismatch at site |
| 12 | First Article Inspection (FAI) Report | Project-specific format | Mandatory — new JIS configurations | All parameters confirmed before batch production |
| 13 | TPI Witness Certificate | JIA / DNV / Lloyds / BV / SGS | Conditional — offshore; LNG; nuclear safety class | EN 10204 3.2 with TPI countersign for offshore and safety-critical |
| 14 | ISO 9001:2015 / JIS Q 9001 Certificate | Third-party QMS certification | Mandatory — EPC projects | JIS Q 9001 is the JIS edition of ISO 9001 — equivalent |
| 15 | Country of Origin + Packing List | Chamber of Commerce / item-level | Mandatory | HS tariff code; JIS grade per line item; A-series or B-series marked |
| 16 | Commercial Invoice + Bill of Lading | Per INCOTERMS 2020 | Mandatory | Freight forwarder issued |
4.5 — ISO and Quality System Compliance
ISO 9001:2015 / JIS Q 9001
JIS Q 9001 is the JIS-language edition of ISO 9001:2015 — the content is identical, and JIS Q 9001 certification is accepted as equivalent to ISO 9001:2015 certification on all international EPC projects. Japanese mills (Nippon Steel, JFE, Kobe Steel) and Japanese trading houses operating in the EPC supply chain hold JIS Q 9001 certification — this is accepted as ISO 9001 compliance for international procurement qualification purposes. Quality Management System scope must cover JIS steel material manufacture including chemical analysis, mechanical testing, dimensional inspection, NDE, heat treatment, marking, and certification — the same QMS scope required for ASTM and EN certified material supply.
ASME B31.3 / JIS B2240 Design Codes
JIS B2240 flanges are listed materials in the ASME B31.3 Appendix A table under footnote provisions — JIS flanges may be used in ASME B31.3 coded piping with appropriate pressure-temperature rating verification from the JIS B2220 tables and confirmation that the JIS flange dimensions, material, and testing meet ASME B31.3 requirements. The key requirement: JIS flanges used in ASME B31.3 coded piping must be hydrostatically tested per JIS B2003 and supplied with a heat-traceable material test certificate confirming JIS composition and mechanical property compliance — a JIS flange without test certification is not an acceptable listed material for ASME B31.3 coded piping regardless of the JIS marking.
NACE MR0175 / ISO 15156 (JIS Grades)
JIS stainless steel grades for sour service — SUS316LTP (≡ TP316L), SUS329J3L (≡ Duplex S31803), and SUS316L bar (≡ A276 316L) — are evaluated against NACE MR0175 / ISO 15156-3 using the UNS number of the equivalent grade (S31603 for SUS316L; S31803 for SUS329J3L). The NACE hardness and heat treatment requirements for the JIS grade are identical to those for the ASTM equivalent — SUS316LTP must be ≤ 22 HRC in the solution-annealed condition; SUS329J3L must be ≤ 28 HRC in the solution-annealed condition. The NACE compliance statement on the JIS material certificate should cite the UNS number and the ISO 15156-3 table reference to confirm compliance in a format that the international project NACE inspector will recognise.
EN 10204 vs JIS Mill Certificates
JIS mill certificates (ミルシート) contain the same technical information as EN 10204 3.1 certificates — heat number, alloy grade, chemical analysis, mechanical test results, and manufacturer’s inspector declaration. For projects requiring EN 10204 3.1: Japanese mills routinely reformat the JIS mill test data into EN 10204 3.1 format upon request — the data content is identical, only the document format changes. Requesting “EN 10204 3.1 format” from a Japanese mill or trading house for export EPC supply is standard practice and does not imply that the material meets anything different from the JIS standard — it means the same test data is presented in the EN 10204 format that the international project QA team and TPI inspector expect. Always specify “EN 10204 3.1” explicitly on the purchase order for all international EPC JIS material supply to avoid receiving only the JIS mill certificate format.
Submit your JIS grade, product form, dimensions, certification requirements, and quantity to RR Hydraulic for a complete, certified commercial offer.