FIELD: metallurgy.
SUBSTANCE: normalising is carried out at 900-920°C as well as pendulum annealing of three to five cycles. Threes include accelerated heating to 600-620°C, curing for 2-3 min and subsequent cooling in to 150-200°C, normalising at 1040-1060°C, curing at 600-620°C with air cooling, tempering from 950-1050°C in oil, drawback at 290-310°C with air cooling.
EFFECT: ruled out chemical and structural homogeneity, stable properties.
1 tbl, 3 dwg
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