including:welding neck flange,socket welding flange,slip-on flange,plate flange,blind flange,thread flange,special flange according to drawings.
pressure:from class 150-2500
fron pn0.6mpa to pn42mpa
size:dn10-3000
material:astm a105,a182,q235,20#,16mn.etc
standard:asme/din/bs/en/iso/jis