The production line used by the heat treatment process are: quenching and tempering of the two.
该生产线所使用的热处理工艺有：淬火和回火两种工艺。
The practice has proved the steel pipe produced by on- line water quenching and tempering a rational technology with low cost and strong marketing competition.
实践证明，利用轧后余热对钢管进行在线水淬，工艺合理，加工成本低，产品具有较强的市场竞争力。
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