STEEL Russian patent published in 2004 - IPC

FIELD: ferrous metallurgy; production of high-strength steels for hold-down bolts of rails. SUBSTANCE: the invention refers to ferrous metallurgy, in particular to production of high-strength rail steels for hold-down bolts of rails. The problem of the invention is to increase complex mechanic properties and hardness of the steels. The steel contains carbon, silicium, manganese, chromium, vanadium, calcium, aluminum, nitrogen and iron at the following components ratio (in mass %): carbon - 0.15-0.19; manganese 0.40-0.60; silicium 0.25-0.37; chromium 0.20-0.35; vanadium 0.05- 0.09; calcium 0.0005-0.004; nitrogen 0.012-0.020; iron the rest. Besides in the steel composition there is a limited amount of admixtures in the following ratio (in mass %): sulfur - no more than 0.025; phosphorus - no more than 0.025; nickel - no more than 0.30; copper no more than 0.30; aluminum no more than 0.005 0.035.. EFFECT: the invention allows to increase the steel mechanical properties and operational durability of the rail hold-down bolts. 2 cl, 2 tbl