Technical reference
Foreign procurement teams commonly specify ASTM/ASME grades; European projects use EN/DIN; Japanese/Korean projects use JIS; Chinese projects use GB. This page consolidates the most-quoted equivalents for fittings, flanges, and pipes.
Elbows, tees, reducers, caps for moderate-to-high-temperature service.
Cr-Mo creep-resistant alloys for high-temperature steam, refinery, power plant.
| ASTM / ASME | EN / DIN | JIS | GB | Service | |
|---|---|---|---|---|---|
| WP1 | 16Mo3 (1.5415) | STPA12 | 15Mo3 | ≤ 530°C | Quote |
| WP11 | 13CrMo4-5 (1.7335) | STPA22 | 12CrMo / 15CrMo | ≤ 580°C | Quote |
| WP12 | 11CrMo9-10 (1.7383) | STPA23 | 12Cr2Mo | ≤ 580°C | Quote |
| WP22 | 10CrMo9-10 (1.7380) | STPA24 | 12Cr2Mo / 12Cr2Mo1 | ≤ 600°C | Quote |
| WP5 | X11CrMo5 (1.7362) | STPA25 | 1Cr5Mo | ≤ 650°C, sulfide | Quote |
| WP9 | X11CrMo9-1 (1.7386) | STPA26 | 1Cr9Mo | ≤ 650°C | Quote |
| WP91 | X10CrMoVNb9-1 (1.4903) | STPA28 / SUS410J3 | 10Cr9Mo1VNbN | ≤ 625°C, supercritical | Quote |
Austenitic 304/316/321/347 corrosion-resistant fittings.
| ASTM / ASME | EN / DIN | JIS | GB | Service | |
|---|---|---|---|---|---|
| WP304 / 304L | X5CrNi18-10 (1.4301) / X2CrNi19-11 (1.4306) | SUS304 / SUS304L | 0Cr18Ni9 / 022Cr19Ni10 | General corrosion | Quote |
| WP316 / 316L | X5CrNiMo17-12-2 (1.4401) / X2CrNiMo17-12-2 (1.4404) | SUS316 / SUS316L | 0Cr17Ni12Mo2 / 022Cr17Ni12Mo2 | Chloride / acid service | Quote |
| WP321 | X6CrNiTi18-10 (1.4541) | SUS321 | 0Cr18Ni10Ti | ≤ 800°C, Ti-stabilized | Quote |
| WP347 | X6CrNiNb18-10 (1.4550) | SUS347 | 0Cr18Ni11Nb | ≤ 850°C, Nb-stabilized | Quote |
| WP310 | X8CrNi25-21 (1.4845) | SUS310S | 0Cr25Ni20 | High-temp, scaling resistance | Quote |
| WP-DS (Duplex 2205) | X2CrNiMoN22-5-3 (1.4462) | SUS329J3L | 022Cr22Ni5Mo3N | Pitting / chloride | Quote |
LNG, cryogenic and arctic pipelines.
Forged carbon flanges per ASME B16.5 / B16.47.
Cr-Mo forged flanges for high-temperature/high-pressure piping.
Austenitic forged flanges per ASME B16.5.
Seamless steel pipes for pressure and structural service.
Seamless / welded austenitic stainless pipes.
| ASTM / ASME | EN / DIN | JIS | GB | Service | |
|---|---|---|---|---|---|
| TP304 / TP304L | 1.4301 / 1.4306 | SUS304TP / SUS304LTP | 0Cr18Ni9 / 022Cr19Ni10 | General corrosion | Quote |
| TP316 / TP316L | 1.4401 / 1.4404 | SUS316TP / SUS316LTP | 0Cr17Ni12Mo2 / 022Cr17Ni12Mo2 | Chloride service | Quote |
| TP321 | 1.4541 | SUS321TP | 0Cr18Ni10Ti | Stabilized, ≤ 800°C | Quote |
| TP347H | 1.4912 | SUS347HTP | 0Cr19Ni10NbN | ≤ 850°C, creep | Quote |
Search-ready answers
These short answers help engineers confirm whether a fitting, flange or certificate requirement belongs in the RFQ before sending drawings.
MSS SP-25 is the marking standard for valves, fittings, flanges and unions. For pipe fittings and flanges it is normally checked together with the product standard, material grade, heat number, manufacturer mark and MTC traceability.
JIS B2220 covers steel pipe flanges used in Japanese projects. When replacing or quoting JIS flanges, confirm pressure rating, facing, bolt pattern, material grade and whether the project needs EN 10204-style material certification.
ASME B31.1 is commonly used for power piping such as boiler external piping and power-plant systems. ASME B31.3 is commonly used for process piping in refinery, chemical and industrial plants. Final selection follows the project design code.
ASTM A234 WPB is a wrought carbon-steel fitting grade for moderate and high-temperature pressure piping. It is commonly used for elbows, tees, reducers and caps matched with A106 Gr.B pipe and A105 forged flanges.
EN 10204 3.1 MTC is issued by the manufacturer with test results traceable to the batch. EN 10204 3.2 adds independent buyer or third-party inspection witness, which is often required for critical EPC, pressure-equipment and offshore projects.
RT is radiographic testing, UT is ultrasonic testing, MT is magnetic particle testing and PT is liquid penetrant testing. The exact percentage and acceptance criteria must follow the drawing, ITP and applicable code.
Manufacturing Range
Standards listed above are the codes we work to. Below is the dimensional and capacity envelope we can deliver from our own shop floor.
Buttweld fittings DN range
DN 15 — DN 1500
ASME B16.9 / EN 10253 / MSS SP-75
Max flange OD
5 m
Forged + machined; ASME B16.47 Series A/B + EN 1092-1
Max forging tonnage
50 t
Custom forgings, blocks, large-OD blanks
Pressure class coverage
PN 6 — PN 400 / Class 150 — 2500
Class 150 / 300 / 600 / 900 / 1500 / 2500 (ASME B16.5 / B16.47); PN 6 - PN 400 (EN 1092-1)
Disclaimer
This cross-reference is compiled from publicly available standards and is for technical reference only. Final material specification must follow the contract technical schedule, applicable mandatory standards (PED, ASME, CE, etc.), and review by qualified materials engineers.
