ASTM A 672 Grade C60/C70 Class 22 LSAW Steel Pipe

ASTM A672 Grade C60 and C70 are manufactured from pressure vessel quality carbon steel plates such as ASTM A516 Grade 60 or Grade 70. For Grade C60, the minimum tensile strength is 415 MPa with a minimum yield strength of 220 MPa. Grade C70 offers higher mechanical performance, with minimum tensile strength of 485 MPa and minimum yield strength of 260 MPa. Class 22 requires full radiographic examination of the weld seam and mandatory normalizing heat treatment to ensure uniform microstructure and improved notch toughness.

At Huayang Steel Pipe, LSAW pipes under ASTM A672 are formed through JCOE or UOE processes with strict control of weld heat input and forming accuracy. Hydrostatic testing is conducted on each pipe, and impact testing can be arranged based on project temperature requirements. Dimensional tolerances comply strictly with ASTM limits, and beveling is prepared for field welding efficiency. This product is suitable for high-pressure steam lines, refinery piping systems, and structural pipelines requiring enhanced weld integrity and mechanical stability.