low alloy steel black rim coil 1.high accuracy 2.OEM offered 3.longer service life ... low alloy steel black grey epoxy resin powder coated rim coil part namematerialdimension(mm)standardrim coillow alloy steelS355J2d672*29 ID 533holes ... as valves ,shafts ,flanges ,and their accesories. materials capability:cast iron ,ductile iron,carbon steel ,alloy steel, ordinary steel ,aluminum ,brass and ...