... AlloyGB 5310, GB3087, DIN 17175St52.4, 16Mn, Boiler pipe, Alloy seamless steel pipeQ345-B, Structure pipe High AlloyGB 5310, G3458, G3462,A335-P12, A213 ... Pressure Equipment PermissionISO 9001:2000Main productsSeamless carbon pipe Seamless oil casing Seamless alloy Applicationfor ordinary services& tubing, pipeline steel pipes pipes for special serviceCompany fileProduction ...