... 201, 301 , 304,304L,316,316L,321 and so on.3. Standard:GB,JIS,BS,DIN.ANSI and Non ... 900,1500,25005. Size:1/2"-40"6. Type:Slip-on flanges, Blind flanges, Lap joint flanges, Welding neck flanges ... ,2502,2631-2635,2642,2573,2566 ,5K-40K and so on .9. Sealing surface : FF ,RF, LJ, FM ,R ... .T.J and so on .10. Production process : raw material--cutting--heating--forging--heat treatment ...