Hebei zhuowei steel pipe manufactring co.ltd of CHINA. professional manufacture the carbon seamless steel pipe,hot-rolling steel pipe, ERW pipe ,hot-expanded steel pipe.Spiral steel pipe,the standard are ASTM A106,ASTM A53,API 5L GR.B.our proucts export canada , Korea .indea, pakistan and so on. contact us one time .we will be friends forever. We are looking forward to cooperating with you sincerely.