Carbon Steel Selection for Oil and Gas: Spec Map and Sour-Service Gates
API 5L PSL2 X65–X80, ASTM A106 Grade B/C, and ASTM A671/A672 are the dominant carbon steel specifications for upstream and midstream oil and gas, selected against 70–140 MPa service pressures, H₂S sour-service limits, and ASME B31.3/B31.8 design rules.
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