FIELD: metallurgy.
SUBSTANCE: heating of workpiece, hot rolling at temperature of 1080-1120°C, formation of the finished section, preliminary accelerated cooling of top of angle section simultaneously on external and internal sides during 0.2-0.3 sec and further forced cooling of the whole product is performed to temperature of 730-760°C during 0.3-0.4 sec by means of final cooling in the air.
EFFECT: high strength at improvement of plastic properties and impact strength at negative temperatures.
1 ex, 2 tbl
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