... 3.Standard:GB,ASTM,API5L,API5CT,DIN,JIS and so on 4.Out Diameter:21.3mm&457mm ... 27SiMn,Q235,ST42,ST52,, A106-a,A106-b,and so on 7.Length:6-12m, As ... customers requestments 8.Technique:Seamless,welded 9.Usage:Low and middle pressure fluid transportation pipeline, Casing Tube, ... Boiler Pipe, Pertroleunm and natural gas industry Chemistry industry, Electric industry 10 ...