Standard: GB8162-99,GB8163-99,GB3087-2000,GB5310-95,GB6479-86,GB9948-88,GB/T17396-98,
YB235-70,YB/T5035-96,ASTM A106 Gr.B;ASTM A53 GR.B;API SPEC 5L GR.B;BS1387;ASTM A179;
ASTM A192;ASTM A335;ASTM A333;DIN1629 ect.
Material: No.10,No.20,No.35,No.45,16Mn,27SiMn,40Cr,15CrMo,35CrMo,45Mn2,12Cr1MoV,38CrMoAl,
DZ40-70,Cr5Mo and J55(37Mn5),N80(36Mn2V,42MnMo7),St37,St44,St52ect
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