Production method of high-tenacity 65Mn spring steel with uniform whole wire rod property

• Main Authors: DENG SUHUAI, TONG QIAN, LIU YANGBO, SUN QISONG, ZHENG FUYIN, ZHANG WEI, CHAO YUELIN, WANG MENG
• Format: Patent
• Language: English
• Published: 29.04.2015
• 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 discloses a production method of high-tenacity 65Mn spring steel with a uniform whole wire rod property, and belongs to the technical field of spring steel. The specific parameters are as follows: the rolling starting temperature is 1000 to 1030 DEG C during rolling, and the temperature of the inlet of a roller is 880 to 900 DEG C after starting; the temperature of a finish rolling inlet is 830 to 850 DEG C; five-section alternative water cooling is adopted after finish rolling, the finish rolling temperature is 830 to 850 DEG C; during Stelmor air cooling line cooling in cooling control, a fan is started to perform rapid cooling after finish rolling, a heat preservation cover for slow cooling begins to cover a position 3m behind the fan, the enter- cover temperature is 620 to 630 DEG C in a lap point position, and the coming-out cover temperature is 480 to 500 DEG C. The method has the advantages that the uniformity of the whole wire rod property of the 65Mn spring steel is realized, the ductility and toughness of the whole wire rod are improved, the drawing yield is improved, and the fatigue property of the spring steel is enhanced.