galvanized welded pipes We can supply the products of high quality,favorable price ... neck flanges ,slip on flanges ,blind flanges ,seamless steel pipes ,welded steel pipes ,square steel pipesMATERIALCarbon steel,stainless steel,alloy steelWe can produce ... -9001:2000,API5L,,CCSWe have biggest pipe fittings and steel pipes production equipment in china,all of prodcts are produced by ...