... lf2 forged flanges welding neck size: from 1/2''_80'' standard: ANSI B16.5 material: alloy steel astm ... a350 lf2 forged flanges welding neck 1/2" to 24 ... 36,DIN 86341-2000, materialCarbon steel(ASTM A105, Q235,A350LF2,A350LF3,)Stainless steel(ASTM A182 F304, F304L,F316 ... A276 S32750,A705 631,632,A961, A484, Alloy steel(ASTM A694 F42,F46,F52,F56,F60,F65,F70 ...