A662 Grade C
USApproximate matchASTM/ASME · ASTM A662/A662M
Family of fine-grain, aluminum-killed carbon-manganese-silicon steel plates, normalized and Charpy-impact tested to guarantee good toughness at low temperature. Used for liquefied gas storage tanks, air separation units, LPG spheres and equipment exposed to sub-zero service temperatures (typically -20°C to -60°C), without requiring the nickel-alloy steels reserved for more extreme cryogenic applications.
| Grade | Region | Standard | Re (MPa) | Rm (MPa) | Delta |
|---|---|---|---|---|---|
| A662 Grade C | US | ASTM A662/A662M | 295 | 480–620 | reference |
| SLA325B | JP | JIS G3126 | 325 | 440–560 | +10% |
| Neighboring grades — different strength | |||||
| A537 Class 1 | US | ASTM A537/A537M (ASME SA-537) | 345 | 485–620 | +17% |
| P355NL1 (n° matière 1.0566) | EU | EN 10028-3 | 355 | 490–630 | +20% |
| P355NL2 (n° matière 1.0577) | EU | EN 10028-3 | 355 | 490–630 | +20% |
| SLA360 | KR | KS D3541 | 360 | 490–610 | +22% |
| SLA365 | JP | JIS G3126 | 365 | 490–610 | +24% |
| Grade | C | Mn | Si | P | S | Cr | Ni | Mo | Cu | Nb | V | Ti | N | Al |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A662 Grade C | ≤0.24 | 0.79–1.62 | 0.13–0.45 | ≤0.035 | ≤0.035 | — | — | — | — | — | — | — | — | — |
| SLA325B | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| A537 Class 1 | ≤0.24 | 0.7–1.6 | 0.15–0.5 | ≤0.025 | ≤0.025 | — | — | — | — | — | — | — | — | — |
| P355NL1 (n° matière 1.0566) | ≤0.18 | 1.1–1.7 | ≤0.5 | ≤0.025 | ≤0.008 | ≤0.3 | ≤0.5 | ≤0.08 | ≤0.3 | ≤0.05 | ≤0.1 | ≤0.03 | ≤0.012 | ≥0.02 |
| P355NL2 (n° matière 1.0577) | ≤0.18 | 1.1–1.7 | ≤0.5 | ≤0.02 | ≤0.005 | ≤0.3 | ≤0.5 | ≤0.08 | ≤0.3 | ≤0.05 | ≤0.1 | ≤0.03 | ≤0.012 | ≥0.02 |
| SLA360 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| SLA365 | ≤0.18 | 0.8–1.6 | ≤0.55 | ≤0.025 | ≤0.02 | — | — | — | — | — | — | — | — | — |
Note: ASTM A662 (grades A/B/C, increasing strength) is the carbon-manganese-silicon plate standard for moderate and low-temperature service, closest to the JIS SLA365 and EN P355NL2 series. Caution: several Chinese trading sites show identical Mn/Si ranges for grades B and C, suggesting a possible reuse of a generic table rather than values verified grade by grade — treat the composition above with caution and confirm it against a real mill certificate before production use. As with the previous grade, this corrects the erroneous A333 Gr.6 / A420 designations initially suggested, which are pipe and fitting standards, not plate.
Values compiled from public sources for guidance only — always verify against the official standard before use in design or fabrication.