... are specialized in the production of steel pipe that our products are used in petroleum, natural gas, chemical power, fire and ... popularity both at domestic and abroad.Second,the datails of products Seamless steel pipe:1. Standard:GB JIS DIN ASTM API ... ,boiler and over-heater.Third,the CPU details of our products Fourth,product Details StandardBS, JIS, GB, DIN, ASTM, APIStandardASTM A106,ASTM ...