product description：
Various process pipeline flanges API6A,ASME B16.5Roughing machining of forging before surfacing, 100% PT inspection after surfacing, hardness inspection of surfacing layer, finishing machining of finished products after surfacing.
Flanges base material:
ASTM A105,ASTM A350 LF1, LF2 CL1/CL2,LF3 CL1/CL2
ASTM A694 F42,F52,F60,F70;
ASTM A182 F304/304L,F316/316L;
API 45K,60K,75K,AISI 4130(M),4140,4340,8630(M);
The Inner diameter of cald flange is 38mm-1800mm.