... one professional manufacturer for Spiral Steel pipe, ERW pipe, Seamless pipe, Casing pipe.Spec:GRB-X42-X100 our company (XINYUANTAI STEEL PIPE GROUP CO.,LTD) is ... 5CT cetificate.* our products are seamless steel pipe, ERW pipe, SSAW pipe. the specifications are following:* SPIRAL STEEL PIPE *OUTSIDE.D 219--3220mm W.T 6 ... ,K55,N80-1,N80Q,L80Q,P110, etc API 5L GRB Spiral steel pipe