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美国得克萨斯州的马拉松-里托尔诺奥公司在其生产的一种典型的大型直流电齿轮传动装置上采用了新的热处理工艺。这种传动装置共包括有10个齿轮。其中的小齿轮是用SAE4820和9310钢制造的,它经渗碳、淬火并回火到RC60-63。其配对轴齿轮用4340和4140钢制造,它经感应淬火并回火到表面硬度为RC55左右。内齿轮用4142钢制造,感应淬火并回火到RC50的上限硬度(RC55以上)。主齿轮(SAE4340钢)承受特殊的技术要求。为了抗磨损和擦伤,这种齿轮进行离子氮化、感应淬火并回火到最终的齿和齿根断面硬度约为RC58。
The American company Marathon-Rio Tolnoo in Texas, USA, uses a new heat-treatment process on a typical large-scale DC gear drive. This transmission includes a total of 10 gears. One of the pinions is made of SAE 4820 and 9310 steel, which is carburized, tempered and tempered to RC60-63. Its mating shaft gear is made of 4340 and 4140 steel, which is induction hardened and tempered to a surface hardness of about RC55. The internal gear is made of 4142 steel, induction hardened and tempered to the upper limit hardness of RC50 (above RC55). The main gear (SAE4340 steel) to withstand special technical requirements. For abrasion and galling, this gear is ion nitriding, induction hardened and tempered to final tooth and root cross-section hardness of about RC58.