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。
By means of extensive tests on nitrided and case hardened gears, it was attempted to discover the possibilities and the limits of nitriding for gears.
通过对氮化和表面渗碳硬化齿轮大量的试验研究，设法揭示对齿轮进行氮化处理的可能性和局限性。
CDS Manufacturing builds table top roll sorters. Standard table top roll sorter system includes a pair of 12 "case hardened stainless steel rollers, adjustable roller height and Angle."
CDS生产公司的台式分类器是一款标准的台式滚动分类系统，设备包括12“表面硬化的不锈钢滚筒，可调节滚筒高度和角度。”
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