Our products not only base on ISO9001-2000 series, but also passed the certification of API. Our featured products are big size seamless steel pipe, hot-rolled steel pipe, hot-expanded steel pipe and spiral steel pipeWe are regularly producing: seamless steel pipe, Spiral Welded Steel Pipe, erw steel pipe, lsaw steel pipe. API 5L Line pipe Seamless Steel Boiler Pipe TubeOur products not only base on ISO9001-2000 series, but also passed the certification of API. Our featured products are big size seamless steel pipe, hot-rolled steel pipe, hot-expanded steel pipe and spiral steel pipeWe are regularly producing: seamless steel pipe, Spiral Welded Steel Pipe, erw steel pipe, lsaw steel pipe. API 5L Line pipe Seamless Steel Boiler Pipe Tube.