size:1/2"-64" materials:carbon steel ,alloy steel standards:ANSI,GB,ASME,DIN,EN etc. WN flange/welding neck flange/carbon steel flange/pipe fitting Quality guaranteed,favourable price & kindly ... , ANSI B16.36, ANSI B16.48 DIN flangeDIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642,DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631,DIN2632 ...