RU2006131194A - SPORT RENT HOT-CALIBRATED FROM SPRING STEEL - Google Patents

Claims (2)

1. Hot-rolled sections made of spring steel, annealed, having predetermined parameters of the microstructure, macrostructure, non-metallic inclusions, mechanical properties, hardenability and elasticity, characterized in that the long products are obtained from steel containing the following ratio of components, wt.%: carbon [C] 0.55-0.65 Manganese [Mn] 0.70-1.00 silicon [Si] 1.70-2.00 chrome [Cr] 0.20-0.40 sulfur [S] 0.005-0.015 nitrogen [N] 0.005-0.010 arsenic [As] 0.0001-0.03 tin [Sn] 0.0001-0.02 lead [Pb] 0.0001-0.01 zinc [Zn] 0.0001-0.005 iron and inevitable impurities rest, when the ratio (As + Sn + Pb + 5 · Zn) ≤0.07 is fulfilled, it has a ferritoperlite structure without graphite, martensite, bainite, and Widmanstatt sections, the actual grain size is 6-12 points, the decarburized layer depth is not more than 1.5% per side, macrostructure - central porosity, point heterogeneity, segregation square no more than 3 points for each species, shrink segregation no more than 3 points; segregation strips no more than 1 point, non-metallic inclusions - for point sulphides, point oxides, line oxides, brittle silicates, plastic silicates, undeformed silicates no more than 2.5 average score for each type of inclusions, mechanical properties after annealing - temporary tensile strength no more than 850 N / mm ² , yield strength, not less than 500 N / mm ² , hardness 192-269 HB, normal modulus less than 200,000 N / mm ² , shear modulus not less than 80,000 N / mm ² . 2. Long products according to claim 1, characterized in that, as an impurity, the steel further comprises, wt.%: Phosphorus not more than 0.020, nickel not more than 0.15, copper not more than 0.15.