Carbon Steel Seamless Steel Pipe
ASTM A 53 GR.B
ASTM A 106 GR.B
API SPEC 5L
Seamless steel pipe DIN2448/1629/2391,DIN17175
American standard: ASTM A 106, A53,API 5L ,5CT, Chinese standard: GB/T3091,GB/T9711.
British standard, ERW high frequency welded pipe BS 1387:1985