We have perfective quality system control and we got the approval of ISO9001 and PED certificate by TUV-Germany in 2005. ansi pipe flange1.Materials, stainless steel Available: EN10222-5/DIN17440: 1.4301, 1.4306/1.4307, 1.4401, 1.4404 and 1.4541, 1.4571 etc. ASTM SA/A182 F304, F304L, F316, F316L, F316Ti, F321 etc. SUS F304, SUS F304L, SUS F316, SUS F316L, SUS F321 etc2.Outside diameter of Flange: ...