A537 CL2 steel plate is the American standard pressure vessel heat treated carbon manganese silicon steel, divided into three levels, namely, A537CL1, A537CL2, A537CL3. Sometimes written or read as SA537CL1, SA537CL2, SA537CL3, SA is written in the ASME standard S said asme, A black metal, and ASTM are more or less the same.
A537CL2 steel plate chemical composition：
CMnPSSiNiCrMoA537CL2≤0.240.7-1.6≤0.035≤0.0350.15-0.5≤0.25≤0.25≤0.08
A537CL2 steel plate Mechanical properties:
| class | Yield Strengthσ0.2(MPa) | tensile strengthσb(MPa) | Elongationδ4% | |
| CL.1 | Normalizing | ≥345 | 485-620 | 22 |
| CL.2 | Quenching + tempering | ≥415 | 550-690 | 22 |
| CL.3 | Quenching + tempering | ≥380 | 550-690 | 22 |
A537CL2 steel plate Low temperature impact:
| class | Plate state | thickness( mm ) | Minimum impact test temperature (℃) | Akv (Longitudinal)( J ) |
| CL.1 | 正火 | ≤ 25 | -62 | ≥20 |
| 25-65 | -60 | |||
| 65-75 | -60 | ≥18 | ||
| 75-100 | -46 | |||
| CL.2 | Quenching + tempering | ≤ 65 | -68 | ≥27 |
| 65-7575-100 | -60-46 | ≥20 |
