STS329J3L
KRApproximate matchKS · KS D 3706
Austenitic-ferritic (duplex) chromium-nickel-molybdenum-nitrogen stainless steel, the most widely used grade in the duplex family. Extensively used in offshore oil & gas piping and flanges for its resistance to pitting and stress-corrosion cracking in seawater/chloride environments, with a yield strength roughly double that of standard austenitic stainless steels (304/316). Not recommended above 300°C (embrittlement) or below -50°C (ductile-to-brittle transition).
| Grade | Region | Standard | Re (MPa) | Rm (MPa) | Delta |
|---|---|---|---|---|---|
| STS329J3L | KR | KS D 3706 | — | — | reference |
| Insufficient mechanical data to compare | |||||
| 1.4462 (X2CrNiMoN22-5-3) | EU | EN 10222-5 | 450 | 640–920 | — |
| F51 (UNS S31803) | US | ASTM A182/A182M (ASME SA-182) | 450 | ≥620 | — |
| F60 (UNS S32205) | US | ASTM A182/A182M (ASME SA-182) | 450 | ≥655 | — |
| SUS329J3L | JP | JIS G4304 / G4303 / G3459 | — | — | — |
| X2CrNiMoN22-5-3 | ISO | ISO 15510 | — | — | — |
| Grade | C | Mn | Si | P | S | Cr | Ni | Mo | N |
|---|---|---|---|---|---|---|---|---|---|
| STS329J3L | ≤0.03 | ≤2 | ≤1 | ≤0.04 | ≤0.03 | 21–24 | 4.5–6.5 | 2.5–3.5 | 0.08–0.2 |
| 1.4462 (X2CrNiMoN22-5-3) | ≤0.03 | ≤2 | ≤1 | ≤0.035 | ≤0.015 | 21–23 | 4.5–6.5 | 2.5–3.5 | 0.1–0.22 |
| F51 (UNS S31803) | ≤0.03 | ≤2 | ≤1 | ≤0.03 | ≤0.02 | 21–23 | 4.5–6.5 | 2.5–3.5 | 0.08–0.2 |
| F60 (UNS S32205) | ≤0.03 | ≤2 | ≤1 | ≤0.03 | ≤0.02 | 22–23 | 4.5–6.5 | 3–3.5 | 0.14–0.2 |
| SUS329J3L | ≤0.03 | ≤2 | ≤1 | ≤0.04 | ≤0.03 | 21–24 | 4.5–6.5 | 2.5–3.5 | 0.08–0.2 |
| X2CrNiMoN22-5-3 | ≤0.03 | ≤2 | ≤1 | — | — | 21–23 | 4.5–6.5 | 2.5–3.5 | 0.1–0.22 |
Note: Correction needed: the Korean standard to use for this grade is KS D 3706 (stainless bars, which mirrors the JIS G4303/G4304 nomenclature term for term, e.g. STS304↔SUS304, STS316L↔SUS316L, STS329J3L↔SUS329J3L), not KS D 3752, which actually covers carbon steel for mechanical use (equivalent to JIS G4051/SM45C, unrelated to duplex stainless or pressure forgings). A Korean standard KS D 4123 also exists ("forged alloy steels for pressure vessels", equivalent to JIS G3203) which would be the most relevant standard for a forged duplex flange, but no precise duplex grade designation under KS D 4123 could be confirmed from a free public source; STS329J3L (KS D 3706) is therefore retained as the best publicly documented Korean designation for this family.
Values compiled from public sources for guidance only — always verify against the official standard before use in design or fabrication.