standard:DIN,ASTM,BS,JIS,ASME,ETC. material:carbon steel ,alloy steel ,stainless steel size:1/2"-48",DN15--DN1200mm Item: flange Standard: DIN,EN,ASTM,BS,JIS,GB,etc. Material: Carbon steel, Alloy steel,Stainless Steel. Usage: Petroleum/Power/Chemical use/Construction use/Gas/Metallury/Shipbuilding Size: 1/2"-48'',DN15-DN1200 Wall thickness: Sch5-Sch160,XXS Type: Seamless or Butt Welding; ...