... GR.B steel pipe Size:1/2''-72'' Standard:ASTM JIS DIN BS EN GB Certification:API Product:API 5l GR ... .B steel pipeSize:1/2''-72'' Specification:73*5.16Certification:APIType ... one month after receiving the formal order. Specifications:1)Standard:ANSI,ASTM,API,DIN,GB,JIS.2)Material ... ,TP304L,TP316L,A335,P5,ST37,ST35.8,ST52,1.0309.3)WT:SCH5,SCH10,SCH20,SCH40,SCH60, ...