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CN-121451077-B - High-strength bearing and preparation process thereof

CN121451077BCN 121451077 BCN121451077 BCN 121451077BCN-121451077-B

Abstract

The invention relates to the technical field of bearings, and provides a high-strength bearing and a preparation process thereof, wherein the high-strength bearing comprises the following components in percentage by mass: 0.13-0.23% of C, 0.3-0.4% of Mn, 0.27-0.67% of Si, 0.15-0.25% of Mo, 1.2-4.2% of Cr, 0.23-0.33% of Al, 0.02-0.06% of Cu, 0.1-0.2% of Nb, 0.06-0.08% of V, 0.1-0.2% of W, 0.01-0.015% of Sm, 0.002-0.005% of Pr, 0.01-0.015% of Y, and the balance of Fe and other unavoidable impurities. Through above-mentioned technical scheme, the problem of bearing intensity inadequately among the prior art has been solved.

Inventors

  • Kang Wenting
  • CHAI GUOLEI
  • YU XINGFU
  • LU MING
  • QU XINJING
  • YAN SHICHANG
  • Guo yinhe

Assignees

  • 河北银河轴承有限公司

Dates

Publication Date
20260505
Application Date
20251121

Claims (7)

  1. 1. A high-strength bearing is characterized by comprising the following components in percentage by mass ：C 0.13%~0.23%、Mn 0.3%~0.4%、Si 0.27%~0.67%、Mo 0.15%~0.25%、Cr 1.2%~4.2%、Al 0.23%~0.33%、Cu 0.02%~0.06%、Nb 0.1%~0.2%、V 0.06%~0.08%、W 0.1%~0.2%、Sm 0.01%~0.015%、Pr 0.002%~0.005%、Y 0.01%~0.015%、, wherein the balance of Fe and other unavoidable impurities is more than or equal to 0.025% and less than or equal to 0.028% of Pr+Sm+Y; the preparation process of the high-strength bearing comprises the following steps of: s1, weighing raw materials according to mass percentage, melting the raw materials to form alloy liquid, casting into steel ingots, cooling to room temperature, and carrying out hot rolling treatment on the steel ingots to obtain steel billets; s2, rolling the steel billet, cutting the rolled steel billet into a material section, heating and forging to obtain a forging, and performing rolling treatment on the forging to obtain a semi-finished bearing product; S3, normalizing and carburizing the semi-finished bearing product; s4, performing spheroidizing annealing treatment, quenching treatment and tempering treatment on the carburized bearing semi-finished product, and performing fine grinding to obtain a high-strength bearing; The carburizing treatment comprises a first segment carburizing treatment, a second segment carburizing treatment and a third segment carburizing treatment; The carbon potential in the first-stage carburization treatment is 1.05% -1.20%, the heating temperature is 875-880 ℃, and the heat preservation time is 3.3-4.3 hours; The carbon potential in the second-stage carburization treatment is 0.95% -1.02%, the heating temperature is 885-890 ℃, and the heat preservation time is 1.2-2.2 h; The carbon potential in the third-stage carburization treatment is 0.85% -0.92%, the heating temperature is 895-900 ℃, and the heat preservation time is 1-2 h.
  2. 2. A process for preparing a high strength bearing according to claim 1, comprising the steps of: s1, weighing raw materials according to mass percentage, melting the raw materials to form alloy liquid, casting into steel ingots, cooling to room temperature, and carrying out hot rolling treatment on the steel ingots to obtain steel billets; s2, rolling the steel billet, cutting the rolled steel billet into a material section, heating and forging to obtain a forging, and performing rolling treatment on the forging to obtain a semi-finished bearing product; S3, normalizing and carburizing the semi-finished bearing product; s4, performing spheroidizing annealing treatment, quenching treatment and tempering treatment on the carburized bearing semi-finished product, and performing fine grinding to obtain a high-strength bearing; The carburizing treatment comprises a first segment carburizing treatment, a second segment carburizing treatment and a third segment carburizing treatment; The carbon potential in the first-stage carburization treatment is 1.05% -1.20%, the heating temperature is 875-880 ℃, and the heat preservation time is 3.3-4.3 hours; The carbon potential in the second-stage carburization treatment is 0.95% -1.02%, the heating temperature is 885-890 ℃, and the heat preservation time is 1.2-2.2 h; The carbon potential in the third-stage carburization treatment is 0.85% -0.92%, the heating temperature is 895-900 ℃, and the heat preservation time is 1-2 h.
  3. 3. The process for preparing the high-strength bearing according to claim 2, wherein the temperature of the hot rolling treatment is 1200-1250 ℃, the time is 4-6 hours, and the high-strength bearing is cooled to room temperature after being cooled to 600-700 ℃; The initial temperature of rolling is 1000-1200 ℃, the heat preservation time is 6-10 min, the initial rolling temperature is 880-1000 ℃, the final rolling temperature is 780-820 ℃, cooling is carried out to 650-680 ℃, and air cooling is carried out; the heating temperature is 800-900 ℃, and the heat preservation time is 30-60 min; The forging ratio of the forging is 1.5-2.0, and the temperature is 850-900 ℃.
  4. 4. The process for preparing the high-strength bearing according to claim 2, wherein the normalizing treatment is performed at 870-920 ℃, the temperature is kept for 2-3 hours, and the bearing is air-cooled.
  5. 5. The process for preparing the high-strength bearing according to claim 2, wherein the carbon potential in the carburizing treatment is 0.85% -1.20%, the heating rate is 7-12 ℃ per min, the temperature is raised to 875-900 ℃, and the heat preservation time is 5.5-7.5 h.
  6. 6. The process for preparing the high-strength bearing according to claim 2, wherein the spheroidizing annealing treatment is performed at a temperature of 750-780 ℃ for 4-6 hours.
  7. 7. The process for preparing the high-strength bearing according to claim 2, wherein the quenching treatment is performed at 850-870 ℃, the temperature is kept for 15-20 min, and oil quenching is performed; the tempering treatment is carried out at a temperature of 150-200 ℃ for 2-4 hours.

Description

High-strength bearing and preparation process thereof Technical Field The invention relates to the technical field of bearings, in particular to a high-strength bearing and a preparation process thereof. Background Bearings are an important support in mechanical equipment to enable the machine to rotate or move with as little friction as possible during operation of the mechanical equipment. With the continuous development of the bearing industry, the performance requirements on the bearing are also higher and higher. The bearings in the usual case are made of alloy steel. The alloy steel used for the traditional bearing is complex in preparation process, and the prepared alloy steel has the problem of insufficient strength, and is difficult to meet the current requirement, so that the preparation of the bearing with high strength is important for industrial development. Disclosure of Invention The invention provides a high-strength bearing and a preparation process thereof, and solves the problem of insufficient strength of the bearing in the related technology. The technical scheme of the invention is as follows: The invention provides a high-strength bearing, which consists of the following components in percentage by mass ：C 0.13%~0.23%、Mn 0.3%~0.4%、Si 0.27%~0.67%、Mo 0.15%~0.25%、Cr 1.2%~4.2%、Al 0.23%~0.33%、Cu 0.02%~0.06%、Nb 0.1%~0.2%、V 0.06%~0.08%、W 0.1%~0.2%、Sm 0.01%~0.015%、Pr 0.002%~0.005%、Y 0.01%~0.015%、 and the balance of Fe and other unavoidable impurities. As a further technical scheme, the high-strength bearing consists of the following components in percentage by mass ：C 0.13%~0.23%、Mn 0.3%~0.4%、Si 0.27%~0.67%、Mo 0.15%~0.25%、Cr 1.2%~4.2%、Al 0.23%~0.33%、Cu 0.02%~0.06%、Nb 0.1%~0.2%、V 0.06%~0.08%、W 0.1%~0.2%、Sm 0.01%~0.015%、Pr 0.002%~0.005%、Y 0.01%~0.015%、, wherein the balance of Fe and other unavoidable impurities is more than or equal to 0.025% and less than or equal to 0.028% by mass Pr+Sm+Y. The components of the bearing accurately limit Pr, sm and Y in mass percent to be more than or equal to 0.025 percent and less than or equal to 0.028 percent, the synergistic effect of the three elements is enhanced, and the strength of the bearing is obviously improved. The invention also provides a preparation process of the high-strength bearing, which is used for preparing the high-strength bearing and comprises the following steps of: s1, weighing raw materials according to mass percentage, melting the raw materials to form alloy liquid, casting into steel ingots, cooling to room temperature, and carrying out hot rolling treatment on the steel ingots to obtain steel billets; s2, rolling the steel billet, cutting the rolled steel billet into a material section, heating and forging to obtain a forging, and performing rolling treatment on the forging to obtain a semi-finished bearing product; S3, normalizing and carburizing the semi-finished bearing product; S4, performing spheroidizing annealing treatment, quenching treatment and tempering treatment on the carburized bearing semi-finished product, and performing fine grinding to obtain the high-strength bearing. As a further technical scheme, the temperature of the hot rolling treatment is 1200-1250 ℃, the time is 4-6 h, and the hot rolling treatment is cooled to 600-700 ℃ in air and then cooled to room temperature quickly. As a further technical scheme, the initial temperature of rolling is 1000-1200 ℃, the heat preservation time is 6-10 min, the initial rolling temperature is 880-1000 ℃, the final rolling temperature is 780-820 ℃, the initial rolling temperature is rapidly cooled to 650-680 ℃, and the rolling is air-cooled. As a further technical scheme, the heating temperature is 800-900 ℃, and the heat preservation time is 30-60 min. As a further technical scheme, the forging ratio of the forging is 1.5-2.0, and the temperature is 850-900 ℃. As a further technical scheme, the temperature of the normalizing treatment is 870-920 ℃, the temperature is kept for 2-3 hours, and the air cooling is performed. As a further technical scheme, the carbon potential in the carburizing treatment is 0.85% -1.20%, the heating rate is 7 ℃ -12 ℃ per minute, the temperature is raised to 875-900 ℃, and the heat preservation time is 5.5-7.5 h. As a further technical scheme, the carburizing treatment comprises a first-stage carburizing treatment, a second-stage carburizing treatment and a third-stage carburizing treatment. As a further technical scheme, the carbon potential in the first-stage carburization treatment is 1.05% -1.20%, the heating temperature is 875-880 ℃, and the heat preservation time is 3.3-4.3 hours. As a further technical scheme, the carbon potential in the second-stage carburization treatment is 0.95% -1.02%, the heating temperature is 885-890 ℃, and the heat preservation time is 1.2-2.2 h. As a further technical scheme, the carbon potential in the third-stage carburization treatment is 0.85% -0.92%, the heating temperature is 895-900 ℃, and the heat pr