METHOD OF PREPARATION OF CALIBRATED ROLLED PRODUCT FOR FABRICATION OF HARDWARE FASTENERS

摘要

FIELD: metallurgy.SUBSTANCE: along the whole section and the length of the rolled product the annealing of the calibrated rolled product is performed at 770-790°C within 3-4 hours, cooling with the furnace down to 660-680°C, holding 3-4 hours, cooling with the furnace down to the temperature 140-150°C with holding 1-2 hours, further cooling in air, primary drawing with the shrinkage 17-19%, heating in the furnace with the monitored atmosphere, patentising at 440-460°C, secondary drawing with the shrinkage 4-5%.EFFECT: high strength and plastic characteristics.1 tbl, 1 ex