The main material for flange are carbon steel, stainless steel and alloy steel.
1. ANSI flanges
Standard:
ANSI b16.5 ansib16.47 ANSI b16.48
Types:
Welding neck flanges, slip on flanges, thread flanges, socket welding flanges, blind flanges, lap joint flanges, ring joint flanges, long welding neck flanges, figure 8 blanks
Pressure grade:
Class 150, class300, , class900, class1500, class2500
Size: 1/2 nb to 48nb

2. DIN flanges
Standard:
DIN2527, DIN2566, DIN2573, DIN2641, DIN2642, DIN2600, DIN2656, DIN2627, DIN2628, DIN2629, DIN2631, DIN2632, DIN2633, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673
Types:
Welding neck flanges, slip on flanges, thread flanges, socket welding flanges, blind flanges
Pressure grade:
6bar, 10bar, 16bar, 25bar, 40bar
Size: Dn10-dn1000

3. JIS b2220 flanges
Types: Sop type, soh type, pleate flanges, blind flanges
Pressure class: 5k, 10k, 16k, 20k, 30k
Size: 10a-1500a

4. Bs flanges
Standard: Bs4504 sec3.1: Welding neck flange(111/134), hubbed slip on flanges(113), lapped pipeend flangese(133), plate flanges(101), loose plate flanges(102), loose plate with weld-neck flanges(104), blank flanges(105)
Standard: Bs4504(part-1)
Pressure grade: Pn2.5 to pn40
Standard: Bs 10: Welding neck flanges, plate slip-on flanges, screwed boss flanges, slip on boss flanges, blind flanges
Types: Table: D, e, f, h
Size: 1/2 nb to 48nb

5. En 1092-1: 2001 flanges
Size: Type1(plate flanges); Type2(loose plate flanges); Type5(blank flanges); Type11(weld-neck flanges); Type12(hubbed slip-on flanges for welding) type13(hubbed threaded flanges)
Pressure class: On2.5, pn6, pn10, pn16, pn25, pn40, pn63, pn100
Size: 1/2 to48