... reducers, caps, flanges and sockets. We have been in this line for about 20 years. Our products are exported to many ... neck flanges ,slip on flanges ,blind flanges ,seamless steel pipes ,welded steel pipes ,square steel pipesMATERIALCarbon steel,stainless steel,alloy steelWe can ... 9001:2000,API5L,,CCSWe have biggest pipe fittings and steel pipes production equipment in china,all of prodcts are produced ...