... " materials:carbon steel ,alloy steel standards:ANSI,GB,ASME,DIN,EN etc. WN flange/welding neck flange/carbon steel flange ... B16.47, MSS SP44, ANSI B16.36, ANSI B16.48 DIN flangeDIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642,DIN2655, DIN2656, DIN2627, ... DIN2628, DIN2629, DIN 2631,DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673 B.S. flangeBS 4504 SEC 3.1 ...