... , X42,X52,X60,X70Place of originChina mainlandSecondary or notNon –secondaryCertificationAPI 5LApplicationSuch as petroleum , chemical ,electrical, ,natural gas ,steel structure and so onChinese standard ... ,12Cr1MoV,15CrMoGGB6479-2000Chemical Fertilizer Pipe20# ,16Mn, 12Cr1Mo,12Cr2MoOthers:1.special design available according to customer requirement2.all the production process are ...