FIELD: technological processes.
SUBSTANCE: invention relates to pearlitic grade structural steels graded hot-rolled products thermomechanical processing. To ensure required strength, plastic and strength characteristics of calibrated rolled metal, rolled stock is annealed at 770–790 °C with holding for 3–4 hours, cooling with furnace to 660–680 °C with holding in furnace for 3–4 hours, cooling with furnace to temperature of 160–170 °C with holding for 2–3 hours, cooling to ambient temperature, primary drawing with reduction ration of 17–19 %, isothermal treatment by patenting in bath with lead at temperature of 360–370 °C, cooling in air, secondary drawing with reduction ratio of 5–6 %.
EFFECT: invention can be used for production of high-strength fasteners form it.
1 cl, 1 tbl, 1 ex
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