... 5L,API 5CT,API 5CT.5B,GB/T9711.1,GB/T9711.2-99 ect Material :J55,K55,N80 ect Product ... ,Quality:First grade5,Others:Special design available according to requirement Anti-corrosion and high-temperature resistant with ... ,API 5CT,API 5CT.5B,GB/T9711.1,GB/T9711.2-99 ectMaterialJ55,K55,N80,L80,N80,P11 ... out effective quality assurance and long-term plan to improve products quality. we can offer many steel ...