ASTM A573 Grade 70 steel is structural quality carbon-manganese-silicon steel plates.
ASTM A573 Grade 70 steel for service at atmospheric temperatures where improved notch toughness is important.
If ASTM A573 Grade 70 steel is to be welded, it is presupposed that a welding procedure suitable for the grade of steel and intended use or service will be utilized.
ASTM A573 Grade 70 steel Plates covered by this specification are limited to a maximum thickness of 1.5 in. [40 mm].
ASTM A573 Grade 70 material chemical composition:
| Grade | C, max | Mn | P,max | S,max | Si | |
| ≤1/2 in(13mm) | >1/2in-1.5in(13mm-40mm) | |||||
| 58 | 0.27 | 0.28 | 0.85-1.20 | 0.035 | 0.04 | 0.15-0.40 |
ASTM A573 Grade 70 carbon steel mechanical properties
| Grade | Tensile strength,ksi,mpa | Yield strength,ksi,mpa | Elongation,8in(200mm),min,% | Elongation,2in,(50mm),min,% |
| 70 | 70-90(485-620) | 42(290) | 18 | 21 |
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