... 304 Slip on flange2. Material:Stainless Steel:such as 201, 301 , 304,304L,316,316L,321 and so on.3. Standard ... :GB,JIS,BS,DIN.ANSI and Non standard, ... DIN2572,2576,2502,2631-2635,2642,2573,2566 ,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-- ...