METHOD FOR PREPARATION OF HOT-ROLLED PRODUCTS FOR PRODUCTION OF FASTENERS Russian patent published in 2019 - IPC C21D8/06 C21D1/20 C21D7/10 

FIELD: metallurgy.

SUBSTANCE: to obtain the required strength and plastic properties of calibrated rolled stock in compliance with GOST 10702-2016 by forming a uniform finely dispersed structure of plate sorbite over the entire cross-sectional area and rolling length, hot-rolled stock is annealed at 770–790 °C with holding for 3–4 hours, cooling with furnace to 660–680 °C, holding in furnace for 3–4 hours, cooling with furnace to temperature of 160–170 °C with holding for 2–3 hours, air cooling, primary drawing with degree of reduction 13–14 %, patenting with isothermal holding at temperature of 490–510 °C, cooling and secondary drawing with reduction degree of 5–6 %.

EFFECT: invention relates to machining of hot-rolled stock and can be used for fabrication of high-strength long-length fasteners.

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