... 4.ideal percentage elongation 5.good mechanical property black steel pipe 1)Application: conveyance of gas, petroleum, liquid ... bright and galvanizedC: Length of each pipe: 500mm-13,000mmD: Steel grade: st35,st35.8,st37,st37.4 ... .E: Conforms to international standards, like:Astm A106,179,192,199,200,210,213,333,335 ... , EN10210, EN10305 etcAPI,GB black steel pipe for normal and mechanical sturcture