... steel Alloy steel 2)Standard: ASME/ANSI, JIS,DIN,GB 3)Size:1/2"-56" 4)Technique: SO,WN Product Flange ... /ANSI/DIN/GB/EN/SH/GD/Types of faceRF, FF, RJ, Tongue&Groove Facing, etc.Surface treatmentblack painting, anti-rust varnish ... stricktly according to ISO9001:2000. ASME B16.5,SCH40,CL150 3" WN Flange