... in the Yanshan County,Cangzhou City,Hebei Province,China,which is the base of steel pipe ,our company occupies an area of 80 ... seamless steel pipe ,API seamless pipe,API spiral pipe ,JIS G3454 STPG370/410,JIS G3444 STK400,JIS G3452 SGP seamless steel pipe,hot galvanized..steel..pipe,stainlesssteel..pipe,etc ...