case hardened

常见例句

Case Hardened : a case hardened fastener is a fastener of ferrous material having a suce which has been made harder than the core.
外貌硬化：外貌硬化的紧固件是玄色金属，其外貌经过处理后比内心硬度要高。
Case Hardened : a case hardened fastener is a fastener of ferrous material having a surface which has been made harder than the core.
表面硬化：表面硬化的紧固件是黑色金属，其表面经过处理后比内心硬度要高。
blog.sina.com.cn
Generously dimensioned ball or roller bearings, case hardened forged and ground gears, and internally and externally reinforced gearboxes ensure a long, low maintenance service life.
大尺寸滚珠或滚子轴承，表面硬化伪造和地面齿轮，齿轮箱内部和外部强化确保长，维护成本低使用寿命。
www.lei-de.com