our main material is ;
ST35,ST37,ST45,ST52,ST55,CK45,20Cr,40Cr,35CrMo,42CrMo,12CrMoV,10CrMo910,
12Cr1MoV,15CrMo etc.seamless steel pipe
standard is ;
GB/T8162-1999 structral seamless steel tube, GB/T8163-1999 fluid seamless steel pipe ,
GB/T3087-1999 boiler tube, GB/T5310-1999 high-pressure boiler seamless steel pipe .
ASTM A 106 ,ASTMA53,ASTM A 179, ASTM A192, ASTMA 333, DIN1629/2448 seamless steel pipe