... BE 4)API certify Carbon Seamless Steel Pipe:1.Seamless steel pipe for general use: ASTM A 53 ... GR.B,Steel Grade: SA53B and speciation ... SCH10S- SCH1202.Seamless steel pipe for high temperature:ASTM A 106 GR.B,Steel Grade: SA106B and speciation ... SCH10S- SCH120;3.Seamless steel pipe DIN2448/1629,DIN17175, German standard,Steel Grade: st37,st42,st52,st35 ...