Gear 1.Largest gears can be measured 2.precise making process ... , process, surfuce quench and carbonize high precision soft/ hard-surfaced gear or gear shaft. The main specification is within Φ3500mm, Mn≤40mm ... Mo, 20CrMnMo, 20CrMnTi, 17CrNiMo6, 20CrNi2MoStandard of pruduction: ISO1328-1995Smelting method: electric arc furnace + refining furnacePrecision accuracy: according to GB/T10095-88 ...