Hypoeutectoid air-cooled hardened bearing steel and production method thereof
A bearing steel and hypoeutectoid technology, which is applied in the field of bearing steel materials, can solve the problems that the core cannot be hardened and is not suitable for bearings with large wall thickness, so as to ensure grain refinement, reduce hydrogen embrittlement sensitivity, and inhibit The effect of grain growth
Inactive Publication Date: 2017-04-05
CENT IRON & STEEL RES INST
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Problems solved by technology
The steel of the present invention can be industrially produced on a large scale through conventional smelting, continuous casting, hot rolling and annealing processes, and solves the problem of reticular carbides in traditional high-carbon bearing steels, hardening of the core and unsuitability for large-wall thickness bearings. Shortcomings
Method used
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[0026] The steel of the present invention is smelted by a laboratory vacuum induction furnace, and the cast ingot shape is a 50kg round ingot. A total of 7 heats of steel were smelted, the chemical composition of which is shown in Table 1.
[0027] Chemical composition (wt.%) of table 1 invention steel
[0028]
[0029] The steel preparation technological process implementation example of the present invention is as follows:
[0030] Step 1: Smelting of steel
[0031] It is smelted by a laboratory vacuum induction furnace, and the casting ingot is a 50kg round ingot.
[0032] Step 2: Forging of steel (simulated hot rolling):
[0033] The steel ingots of 1-7# steel are heated at 1200°C, kept for 5 hours, and then forged and billeted. The starting forging temperature range is 1200°C, the final forging temperature is 800°C, and the final forging is a round bar with a diameter of 60mm and a round bar with a diameter of 150mm. After forging, it quickly enters a 700°C protect...
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Abstract
The invention discloses a hypoeutectoid air-cooled hardened bearing steel and a production method thereof, and belongs to the technical field of bearing steel materials. The steel comprises 0.45-0.75 wt% of C, 2.5-5.0 wt% of Mn, 0-2.0 wt% of Si, 0-2.0 wt% of Cr, and the balance of Fe and inevitable impurities. One or more of 0-0.2 wt% of Mo, 0-0.20 wt% of Nb, 0-0.20 wt% of V and 0-0.2 wt% of rare earth RE can be added to the steel. The hypoeutectoid bearing steel simplifies a bearing manufacturing technology, reduces the bearing manufacturing cost, also can be used to manufacture large and super large bearings, and has a wider application range than traditional bearing steel GCr15.
Description
technical field [0001] The invention belongs to the technical field of bearing steel materials, and in particular provides a hypoeutectoid air-cooling hardening bearing steel and a preparation method thereof, the chemical composition, preparation technology and application technology of an air-cooling hardenable non-mesh carbide bearing steel material. The application of hypoeutectoid bearing steel not only simplifies the bearing manufacturing process and reduces the bearing manufacturing cost, but also can be used to manufacture large and extra large bearings, which has a wider range of application than traditional bearing steel GCr15. Background technique [0002] At present, the domestic production of bearing steel has reached 4 million tons, of which about 85% of the bearing steel bars are small and medium-sized bars with a diameter of less than 70mm, while the other round bars with a diameter of more than 70mm are large bars, accounting for about 100% of the total amount...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/12C22C33/04
CPCC22C38/02C22C33/04C22C38/005C22C38/04C22C38/12C22C38/18
Inventor 曹文全徐海峰俞峰许达
Owner CENT IRON & STEEL RES INST