齿轮钢 Gear steel | 20CrMnTiH 22CrMoH 20CrMnMoH 20CrNiMoH 16-28MnCr5H 18CrNiMo7-6H SCM420H SAE8620H TL4227H | Ф20~350 | GB/T 5216 EN 10084 ASTM A304 供货技术条件 技术协议 Technical agreement for supply Technical protocol | 用于制作汽车、风电、机械行业的齿轮。 Used for making gear wheels of automobiles, wind power, engineering machinery and other fields. |