... for Spiral Steel pipe, ERW pipe, Seamless pipe, Casing pipe.Spec:GRB-X42-X100 our company (XINYUANTAI STEEL PIPE GROUP CO.,LTD) is one ... professional steel pipe manufacturer.we already passed *ISO certificate ... STEEL PIPE*OUTSIDE . D 139.7-269.9mmW.T. 6.2-15.11mmMATERIAL: J55,K55,N80-1,N80Q,L80Q,P110, etc Carbon Steel ...