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Long-life high-carbon bearing steel pipe and preparation method and application thereof

A high-carbon bearing and long-life technology, applied in the field of bearing steel, can solve problems such as low life, high inner and outer rings of bearings, and inability to manufacture fatigue life

Pending Publication Date: 2021-12-31
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a long-life high-carbon bearing steel pipe and its preparation method and application. The high-carbon bearing steel pipe prepared by the present invention has a relatively high contact fatigue life, which can solve the problem of low life of traditional bearing steel pipes. The problem that it is impossible to manufacture bearing inner and outer rings with high fatigue life under the direct turning process

Method used

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  • Long-life high-carbon bearing steel pipe and preparation method and application thereof
  • Long-life high-carbon bearing steel pipe and preparation method and application thereof
  • Long-life high-carbon bearing steel pipe and preparation method and application thereof

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preparation example Construction

[0037] The present invention provides a preparation method of the long-life high-carbon bearing steel pipe described in the above scheme, comprising the following steps:

[0038] Corresponding to the chemical composition of the long-life high-carbon bearing steel pipe, smelting each preparation raw material to obtain an ingot;

[0039] Homogenizing the cast ingot, and then performing hot forging or hot rolling to obtain bearing steel rods;

[0040] rolling the bearing steel bar through a pipe to obtain an intermediate pipe;

[0041] The intermediate pipe is subjected to spheroidizing annealing, quenching and tempering in sequence to obtain a long-life high-carbon bearing steel pipe.

[0042] According to the chemical composition of the long-life high-carbon bearing steel pipe, the present invention smelts each preparation raw material to obtain an ingot. The present invention has no special requirements on the smelting process, and the smelting process well known in the art ...

Embodiment 1

[0057] According to the composition of furnace number 1# in Table 1, each preparation raw material is smelted, adopts vacuum induction furnace to smelt, casting ingot shape is the round ingot of 50kg, and ingot diameter is about 120mm;

[0058] Heating the ingot at 1200°C, holding it for 6 hours for homogenization treatment, and then forging the billet, the forging temperature range is 1220°C, water cooling after forging, and finally forging into a bearing steel bar with a diameter of 50mm;

[0059] Heat the bearing steel bar with a diameter of 50mm to 1040-1050°C and keep it warm for 2 hours; carry out rough rolling on the heated bar to pass through the tube, and control the starting rolling temperature at 1000°C; then perform finish rolling and control the final rolling The temperature is 930°C, and after rolling, it is quickly water-cooled to 600°C and then air-cooled to room temperature to obtain intermediate pipes;

[0060] The intermediate pipe is subjected to spheroidiz...

Embodiment 2～6

[0064] The long-life high-carbon bearing steel was prepared with reference to the conditions of Example 1, the only difference being the composition of the high-carbon bearing steel, see Table 1 for heat numbers 2# to 6# for specific composition.

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Abstract

The invention provides a long-life high-carbon bearing steel pipe and a preparation method and application thereof, and belongs to the technical field of bearing steel. The long-life high-carbon bearing steel pipe is prepared from the following components in percentage by mass: 0.93-1.05wt% of C, 1.35-1.60wt% of Cr, 0.20-0.35wt% of Si, 0.25-0.45wt% of Mn, less than or equal to 0.015%wt% of P, less than or equal to 10ppm of S, 0.05-0.20wt% of Nb, 0-0.20wt% of Mo, 0-0.20wt% of V, 0-0.20wt% of Zr, 0-0.2wt% of Ni, 0-0.2wt% of Cu and the balance Fe. The prepared high-carbon bearing steel pipe has long contact fatigue life, and the problems that the service life of a traditional bearing steel pipe is short, and bearing inner and outer rings long in fatigue life cannot be manufactured through a direct turning technology can be solved.

Description

technical field [0001] The invention relates to the technical field of bearing steel, in particular to a long-life high-carbon bearing steel pipe and its preparation method and application. Background technique [0002] The traditional bearing manufacturing process includes material selection of bearing steel, thermal processing of bearing inner and outer rings and rolling elements, cold processing and bearing assembly. Among them, the thermal processing of the inner and outer rings of the bearing includes the austenitization of the bearing steel used to make the inner and outer rings of the bearing between 850 and 1100 °C, the punching of the bearing steel, the thermal twisting of the inner and outer rings of the bearing, and the spheroidization heat treatment of the inner and outer rings of the bearing. , Cold working and grinding of inner and outer rings of bearings. Therefore, processes such as thermal processing for localization of bearing manufacturing and heat treatm...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/26C22C38/48C22C38/22C22C38/44C22C38/24C22C38/46C22C38/28C22C38/50C22C38/20C22C38/42C21D1/32C21D1/18F16C33/62F16C33/64
CPCC22C38/02C22C38/04C22C38/26C22C38/48C22C38/22C22C38/44C22C38/24C22C38/46C22C38/28C22C38/50C22C38/20C22C38/42C21D1/32C21D1/18F16C33/62F16C33/64C21D2211/008F16C2204/66F16C2204/70
Inventor 曹文全王辉史智越王存宇徐海峰俞峰梁剑雄许达刘正东
Owner CENT IRON & STEEL RES INST
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