Flange Welding Neck, Slip-on, Blind, Plate, Socket Welding ANSI B16.5 BS4504 DIN2576 2632 2633 Forged Flange1. ASME FlangesSTANDARD:ASME B16.5, ASME B16.47PRESSURE GRADE:Class150,Class300,Class600,Class900,Class1500,Class2500MATERIAL: ASTM A105ASTM A694 F42/46/52/56/60/65/70ASTM A350 LF2/LF3 2. DIN FlangesSTANDARD:DIN2627, DIN2628,DIN2629,DIN 2630,DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, ...