METHOD FOR MAKING ROLLED PRODUCTS FOR MANUFACTURE OF HIGH-STRENGTH ROD FASTENING HARDWARE PRODUCTS Russian patent published in 2023 - IPC C21D8/06 

FIELD: steel processing.

SUBSTANCE: invention can be used in the manufacture of high-strength fastening rod products from pearlite-class structural steels for automobiles, tractors, agricultural and special equipment. The method of preparing hot-rolled steel for the manufacture of high-strength rod fastening hardware products includes annealing in a furnace for 3-4 hours, cooling with the furnace and holding for 3-4 hours, cooling of rolled metal in air to the temperature of the cooling medium, primary drawing, isothermal processing by patenting, secondary drawing, annealing is carried out at a temperature of 760-780°C, after exposure in the oven, cooling is carried out with the oven to a temperature of 650-670°C, before cooling in air, cooling is carried out with the furnace to a temperature of 170-180° with a holding time of 2.5-3 hours, primary drawing is carried out with a degree of 18-21%, secondary drawing is carried out with a degree of 5-6%, and isothermal processing by patenting is carried out at a temperature of 425°C.

EFFECT: obtaining the necessary strength and plastic properties of calibrated rolled products that meet the requirements of “ГОСТ 10702-2016” “The bars of structural non-alloy and alloy steel for cold die forming. General specifications" due to the preparation of a finely dispersed structure of lamellar sorbitol, uniform over the entire cross-sectional area and length of the rolled coil.

1 cl, 1 tbl, 1 ex