... follow: seamless steel pipe, ERW steel pipe, spiral pipe, hot-rolled seamless steel pipe, large-caliber thick wall steel pipe, stripe etc.Tianjin ... Shunyida steel co. ltd holds two high frequency ERW pipe production lines, which are capable of producing57273×214mm ERW ... can produce 2192020×416mm spiral steel pipe. In addition, There are two intermediate frequency hot expanding steel pipes sets which ...