Do you know how the steel was tempered?

问题描述:

Do you know how the steel was tempered?

有本书,How the steel was tempered.翻译就是钢铁是怎样炼成的!
但是,从金属工艺学来说,翻译则是你知道钢铁是怎样回火处理的吗?
因为钢铁热处理分为:正火 退火 淬火 回火(temper) 4种工艺.