How many operations are there in the heat treatment of steel?

钢的热处理有多少种操作方法？

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Vacuum heat treatment is the new technique in the heat treatment of metallic material.

真空热处理是金属材料热处理领域的新技术。

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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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At least 900 of the boxes of evidence will be subjected to heat treatment within the coming weeks in an attempt to neutralise the growths.

BBC: Asil Nadir

Pasteurization, which involves heat treatment, would have killed the bacteria in the Odwalla products.

CNN: E. coli poisoning leads to Odwalla juice recall

The usual forms of processing that involve heat treatment were found to denature, or destroy, the useful proteins in the mussels.

BBC: Puppies