flat welding flange Material:A105/Q235,304/304L,316,316L,A182F5,A182F11,.ect. Size: ... . Size:1/2''-60'' Pressure:150lbs-2500lbs Facing:RF/FF/Material:A105/RST37.2/C22.8/Q235,304/304L,316,316L ... any restriction in flow whenusing a socket welding flange. YH-0025 stainless stell welding neck flange