ASTM A203 Grade B low temperature pressure vessel steel should be killed steel and should meet the fine-grained material requirements z in the A20/A20M standard.
The ASTM A203 standard specifies the size, shape, technical requirements, inspection methods, inspection rules, packaging, markings and quality certificates of A203 Grade B steel plates for low-temperature pressure vessels. The maximum thickness of 100mm of A203 Grade B steel plate is restricted by chemical composition regulations and mechanical performance requirements. The small thickness of the steel plate is limited to 0.25in (6.5mm).
ASTM A203 Grade B material is a nickel-alloy steel plates intended primarily for welded pressure vessels in low temperature environment. As a steel making practice, the steel shall be killed and shall conform to fine grain size requirements. The heat treatment requirements for all plates are presented, and all plates under A203 Grade B shall be normalized as required.
Mechnical property for A203 Grade B steel plate
| 275 | 485-620 | 200mm | 50mm |
| 17 | 21 | ||
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