ASTM A266/ASME SA266	Specification for Carbon Steel Forgings for Pressure Vessel Components
Material Grade	Grade 1	Grade 2	Grade 3	Grade 4
Product Form
Flanges(ASME B16.47,B16.48,B16.5,MSS SP44,BS10,BS3293,BS4504, ISO7005-1)	WN(welding-neck);SO(slip-on);PL(Plate);BL(Blind);Th(Threaded); SW(scket-welding);LF/SE(lapped flange/stub end);LWN(long welding neck);Orifice flange;Reducing flange;API flange;Integral/Compact flange;Spectacle blind, Lind spade and spacer,Paddle blind,Paddle spacer;Orifice plate; Pipe plate,Bleed ring,Overlap Flange.
ASME B16.11	Forged threaded fittings:90-deg elbow,45-deg elbow,tee,cross, coupling,half-coupling,cap,square head plug,hex head plug, round head plug,hex head bushing,flush bushing,street elbows
ASME B16.11	Fogred socket weld fittings:90-deg elbow,45-deg elbow,tee,cross, coupling,half-coupling,cap
MSS SP83	Steel Pipe Unions(socket welding and threaded end)
MSS SP95	swage nipples,bull plug(ends may be threaded,beveled,plain)
MSS SP79	socket welding reducer inserts
MSS SP97	weldolets,threadolets,sockolets,flangolets,elbolet,sweepolets, saddle,nipolets,brazolets,latrolets,insertolets
Forgings	Forgings,Rings,Discs,Disks,Tubesheets,Shaft,Sleeves, Bars,Valves,etc.

ASTM A266 GR.3 SO flange

Nickel Alloy Steel Flange