ASME SA573 carbon steel standard specifies three grades structural carbon steel plates of improved toughness. The steel shall be made by fine grain practice. Heat and product analysis shall conform to the chemical composition requirements prescribed for carbon, manganese, phosphorus, sulfur, and silicon as follows.
ASME SA573 plates covered by this specification are limited to a maximum thickness of 1.5 in. [40 mm].
ASME SA573 Grade 58 [400]
ASME SA573 Grade 65 [450]
ASME SA573 Grade 70 [485]
ASME SA573 carbon steel chemical composition (%)
| Element | Grade 58 | Grade 65 | Grade 70 |
| Carbon, ≤1/2" Thick | 0.23 | 0.24 | 0.27 |
| Carbon, >1/2"-1 1/2" Thick | 0.23 | 0.26 | 0.28 |
| Manganese | 0.60-0.90 | 0.85-1.20 | 0.85-1.20 |
| Phosphorus Max. | 0.03 | 0.03 | 0.03 |
| Sulfur Max. | 0.03 | 0.03 | 0.03 |
| Silicon | 0.10-0.35 | 0.15-0.40 | 0.15-0.40 |
ASME SA573 carbon steel tensile requirement
| Grade | Yield Strength Mpa min. |
Tensile Strength Mpa |
Elongation min.% in 200mm |
Elongation min.% in 50mm |
| SA573 Grade 58 | 220[32] | 400-490 | 21 | 24 |
| SA573 Grade 65 | 240[35] | 450-530 | 20 | 23 |
| SA573 Grade 70 | 290[42] | 485-620 | 18 | 21 |
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