... .1-30mm 4.Finish:Seamless SpecificationsGH4145 Standard: AISI,ASTM, JIS, GB etc. Out diameter:5-650mmm Wall thickness:0.1-30mm ... pilgered / manual polished / mechanical polished 3) Standards: a) GB/T 14975-2002, GB/T 14976-2002, GB 13296-91 b) ASTM A213, ASTM A312, ASTM ... compound production etc. 4.Kind: rolled, forged, drawn. 5.Standard : GB/T2072-93, GB3120-82, G84435-84. Our Advantage 1.Competitive ...