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ASTM
Standard Number
A 691 (Carbon And Alloy Steel Pipe Electric Fusion Welded for High Pressure Service at High Tempeeratures)
Grade CM-65 CM-70 CM-75 CNSH-70 CNSH-75 CMSH-80 1/2CR 1 CR 1 1/4CR 2 1/4CR 3 CR 5 CR 9 CR [ All grade ]