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pack hardening
auto.	装箱渗碳硬化
avia.	堆集硬化
oil	装箱渗碳硬化
plast.	表面硬化处理〈渗碳，渗氮等〉
space	堆集硬化 (在松散堆集的含碳材料中加温渗氮的硬化工艺)
pack-hardening
gen.	装箱表面渗碳硬化
met.	装箱表面硬化; 装箱渗碳; 装箱渗碳表面硬化
tech.	装箱渗碳硬化; 固体渗碳硬化

pack hardening: 2 phrases in 1 subject

Metallurgy

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