Large Steel Pipe Standard:ASTM,GB,JIS,DIN Grade:ASTM A53-A B A106-A B C A135 A179 Wall Thickness:5-30mm Diameter:168-1200mm Large Diameter Steel Pipes Seamless and Welded1. Grade: 201, 202, 304, 304L, 316L, 309S, 310S, 321, 410, 420, 430, St37 St37-2 St35.8 St42.2 St52 ST42 ASTM A53-A B A106-A B C A179-C A210-C 10# 20# 45# Q195 Q235B Q345B etc2. Wall Thickness: 5-30mm3.OD: 168-1220mm 6"-48"4. ...