Controlled-rolling and controlled-cooling high-strength pearlitic steel rail and production method thereof

• Main Authors: ZHENG JIANGUO, OUYANG MINLU, FEI JUNJIE, WANG RUIMIN, DONG MAOSONG, ZHOU JIANHUA
• Format: Patent
• Language: Chinese; English
• Published: 16.03.2021
• 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; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses a controlled-rolling and controlled-cooling high-strength pearlitic steel rail and a production method thereof. The controlled-rolling and controlled-cooling high-strength pearlitic steel rail comprises the following chemical components in percentage by mass: 0.71-0.85% of C, 0.45-0.70% of Si, 0.35-0.70% of Mn, 0.2-1.0% of Cr, 0.05-0.1% of V, 0.005-0.08% of Nb, 0-0.025% ofP, 0-0.015% of S and the balance of Fe and inevitable impurities; and the tensile strength of the steel rail is larger than or equal to 1360 MPa, the ductility is larger than or equal to 12%, the railhead tread hardness is larger than or equal to 390 HB, the hardened layer depth is larger than or equal to 30 mm, the structure is thin-sheet pearlite, and the pearlite lamellar spacing away from theposition 30 mm deep away from the surface of the steel rail is smaller than or equal to 90 nm. The strength and hardness of the steel rail are improved, and meanwhile good toughness and plasticity are kept. 本发明公开了一种控轧控冷高强度珠光体钢