carbon steel and stainless steel weld neck flanges 1.Size:4'' * 150lbs 2.Material: A105 3.Standard:ANSI B16.5 carbon steel and stainless steel weld ... B16.47, ASME B16.36,DIN2505,EtcMaterialCarbon steel(ASTM A105,Q235,A350LF2,A350LF3,Etc)Stainless steel(ASTM A182 F304, F304L,F316,F316L ... ,F321,F347,F310F44F51,A276 S31803, A182, F43,Etc)Alloy steel(ASTM A694 F42,F46,F52,F56,F60,F65,F70, A182 ...