... or Ion nitrification Gear class :AGMA12 Spiral Bevel Gear for gear box 1) Material: 42CrMo, 35CrMo, 17CrNiMo , 20CrMnMo, 20Cr2Ni4, , 20CrMnTi and so on or ... distortion Ion nitrification HRC58-62 and deep 0.7-1mm Other hearttreatment according client request . 3) Gear class : Grade V or ... Dia. 2000mm2. Max mould :30 mould Custormer's drawing and samples are welcome crown wheel and pinion for gear box