... .Seamless steel pipe for general use: ASTM A 53 GR.B,Steel Grade: SA53B and speciation O.D:1/2"-28 ... .Seamless steel pipe for high temperature:ASTM A 106 GR.B,Steel Grade: SA106B and speciation O.D:1/2"-28 ... : SCH10S- SCH120;4.line Pipe: API SPEC 5LSteel Grade :A,B,X42,X46,X52 (PSL1)and speciation O.D: 2"-28 ...