... AISI,ASTM, JIS, GB etc. 2.Out diameter:5-650mmm 3.Wall thickness:0.1-30mm 4.Finish:Seamless SpecificationsGH4145 Standard: AISI,ASTM ... , JIS, GB etc. Out diameter:5-650mmm Wall thickness:0.1-30mm Finish:Seamless acid Specifications Alloy Steel Pipe ... : GB/T2072-93, GB3120-82, G84435-84. Our Advantage 1.Competitive price. 2.Our strengths over other suppliers. 3.Reliable ...