FIELD: process engineering.
SUBSTANCE: invention relates to thermal processing processes. To up the article cold resistance and to down its warpage it is subjected to reducing tempering at 450±10°C with holding of 3-7 hours and, then, air is cooled. Note here that article is heated to 100-450°C is conducted at the rate of up to 50°C/h.
EFFECT: higher cold resistance and decreased warpage.
2 ex, 2 dwg
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