High-strength long-service-life rack steel

• Main Authors: YANG GAOCHENG, SUN HONGPING, CAO HONGFU, HUANG ZHEN
• Format: Patent
• Language: Chinese; English
• Published: 27.09.2019
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to a high-strength long-service-life rack steel. After the steel is subjected to quenching and low-temperature tempering treatment, the tensile strength Rm is larger than or equal to 1650 MPa, and the symmetric tensile fatigue strength Sigma-1 is larger than or equal to 750 MPa. A great amount of data regression analysis is carried out through testing the contribution of the chemical elements to tensile strength and impact toughness, the chemical components are redesigned, so that the tensile strength and the fatigue strength of the rack steel are obviously improved, and the rack steel comprises the following components of, in percentage by mass, 0.22%-0.32% of C, 0.17%-0.37% of Si, 0.55%-1.55% of Mn, less than or equal to 0.015% of P, less than or equal to 0.030% of S, 0.60%-1.65% of Cr, 0.15%-0.45% of Mo, 0.65%-1.65% of Ni, 0.02%-0.25% of Cu, 0.02%-0.035% of Al, 0.01%-0.06% of Nb, 0.0003%-0.0006% of B. 本发明涉一种高强度长寿命齿条钢，该钢经淬火和低温回火处理后，抗拉强度Rm≥1650MPa，对称拉压疲劳强度σ-1≥750MPa。通过检验化学元素对抗拉强度、冲击韧性的贡