MEDIUM-CARBON ALLOY STEEL AND PRODUCT MADE FROM SUCH STEEL Russian patent published in 1996 - IPC

FIELD: metallurgy. SUBSTANCE: steel contains carbon, manganese, silicon, chromium, copper and iron and further contains aluminum, calcium and cerium with the following ratio of components, % by weight: carbon 0.30-0.45; manganese 1.20- 1.60; silicon 0.20-0.60; chromium 0.30-0.60; copper 0.10-0.30; aluminum 0.001- 0.030; calcium 0.001-0.003; cerium 0.001-0.003; iron the balance. Content of silicon and copper, as well as of manganese, chromium and silicon is in the following ratio: 1,0 ≥ Si+2Cu ≥ 0,5 2,5 ≥ Si+Cr+Mn ≥ 1,8,. Products made from such steel possess increased strength combined with high plasticity. EFFECT: improved properties of steel and products made from such steel, increased ductility of steel and high corrosion-resistance in quenched and tempered state, improved ductility of thermally hardened tape made from such steel. 3 cl, 2 tbl