... hard faced 敷焊硬合金的 hard facing metal 敷焊用硬金属；表面硬化金属 hard facing of tool joint 钻杆接头表面加硬层 ...
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而大多数有色金属可以进行退火，但不能进行正火或者表面硬化。
Most nonferrous metals can be annealed, but never tempered, normalized, or case-hardened.
在该工具内面的特殊的经硬化处理的金属割刀与落鱼的外表面接合。
Special hardened metal-cutters on the inside of the tool engage on the external surfaces of the fish.
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。
Case hardened: a case hardened fastener is a fastener of ferrous material having a surface which has been made harder than the core.
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