... , WP11, WP12, WP22, WP5, WP9, WP91DIN:Carbon Steel: St37.0, St35.8, St45.8Stainless Steel: 1.4301, 1.4306, 1.4401, 1 ... , DIN, BS,GB, SH, HG,QOST,ETC.certification:ISO9001:2008 , API , ASME,CE, HSEApplications range: Petroleum, chemical, power, gas, metallurgy, shipbuilding ...