焼やき戻もどし

noun, noun or participle which takes 'suru'

tempering; annealing

Metallurgical heat treatment: reheating quenched steel to a moderate temperature to reduce brittleness while retaining hardness. In Japanese industrial usage, 焼き戻し specifically refers to tempering after quenching, while 焼きなまし (annealing) is a distinct process.

• 焼やき入いれした鋼はがねは、そのままでは脆もろいので焼やき戻もどしを行おこなう。

  Quenched steel is brittle as it is, so tempering is performed.

• 焼やき戻もどし温おん度どが高たかいほど、鋼はがねは軟やわらかくなる。

  The higher the tempering temperature, the softer the steel becomes.