学习条件: 钢制造(Steel Tempering) Lv 1, 武器保有 ( Hilt Biding ) Lv 1 内容: 有一定几率，可找出怪物身上所拥有的矿石。
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Iron and steel tempering worker 鉄钢热処理工
Tempering of steel 钢的回火
tempering alloy tool steel 回火合金工具钢
tempering steel 回火钢材
quenching and tempering steel 合金调质钢
steel bottle tempering production line 钢瓶调质线
The purpose of tempering steel 三．三
Non-Quenching-Tempering Steel 12Mn2VB Mn2VB非调质钢
Tempering is possible because of the instability of the martensite, the principal constituent of hardened steel.
由于马氏体这一淬硬钢主要成分的不稳定性，使得回火成为可能。
There are three main operations in the heat treatment of steel: hardening tempering and annealing.
钢的热处理操作主要有三种，即：淬火、回火和退火。
There are three main operations in the heat treatment of steel: hardening, tempering and annealing.
钢的热处理操作主要有三种，即：淬火，回火和退火。
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