FIELD: metallurgy.
SUBSTANCE: hot-rolled rod with diameter of 13-17 mm is made from steel containing the following, wt %: carbon 0.50-0.65, silicon 0.05-0.20, manganese 0.07-0.15, aluminium 0.02-0.09, nitrogen 0.004-0.016, titanium 0.025-0.10, niobium 0.010-0.035, chrome 0.05-0.10, nickel 0.05-0.10, copper 0.15-0.20, iron and inevitable impurities are the rest; a B-shaped terminal is made from the rod, heated up to 850-920°C, then cooled with a fast water flow during 6-8 seconds and annealing is performed at 180°C during 2 hours so that annealing martensite structures are provided in the surface layer of the terminal, and troostosorbite is provided in the core.
EFFECT: providing stability of mechanical properties of elastic terminals, relaxation stability and cyclic durability.
2 cl, 1 tbl, 1 ex
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