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Bearing steel and technology for heating processing

A technology of bearing steel and process, which is applied in the field of new bearing steel and heat treatment process, can solve the problems of rolling fatigue life and strength and toughness reduction, exceeding the standard, restricting the service life and reliability of bearings, etc., to reduce production costs and reduce chromium content Effect

Inactive Publication Date: 2010-06-09
LUOYANG BEARING SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] High-carbon chromium bearing steel GCr15 (1.0-C, 1.5-Cr) is the most widely used bearing steel variety in various countries for more than 100 years. The main reason is that it has excellent rolling fatigue performance, high hardness and good wear resistance. However, there is a certain amount of coarse eutectic carbides in the crystalline structure of GCr15 steel, which often leads to a significant reduction in rolling fatigue life and strength and toughness. further heat processing
At present, the continuous casting GCr15 bearing steel produced in my country is limited by the production equipment, and the high-temperature diffusion annealing time is far from enough, so the banded carbides of the bearing steel are often on the line required by the GB / T18254 standard, or even seriously exceed the standard, which seriously restricts The service life and reliability of bearings made of this steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. The chemical composition of the bearing steel of the present invention is (weight percentage): C: 0.70%, Si: 0.55%, Mn: 1.00%, Cr: 0.50%, Mo: 0.01%, P: 0.008%, S: 0.004 %, Ni: 0.01%, Cu: 0.02%, Ni+Cu: 0.03%, and the rest are Fe and unavoidable impurities.

[0023] 2. Heat treatment process of steel (before workpiece machining):

[0024] Normalizing treatment: When the steel is heated in the furnace to a temperature of 870°C, it is kept for 1 hour, and the steel is cooled by a fan in the air when it comes out of the furnace.

[0025] Annealing treatment: heat the steel in the furnace to 700°C for 1 hour, then heat it to 760°C for 3 hours, then cool it down to 680°C for 4 hours, and finally cool it down to 30°C / h. At 550°C, cool with the furnace.

[0026] 3. Heat treatment process of semi-finished products after workpiece machining:

[0027] Quenching treatment: When the workpiece is heated to a temperature of 790°C in the furnace, it is kept for 45-50 minutes, and ...

Embodiment 2

[0030] 1. The chemical composition of another embodiment of the bearing steel of the present invention is (weight percentage): C: 0.75%, Si: 0.60%, Mn: 1.05%, Cr: 0.60%, Mo: 0.01%, P: 0.012%, S: 0.005%, Ni: 0.06%, Cu: 0.01%, Ni+Cu: 0.07%, and the rest are Fe and unavoidable impurities.

[0031] 2. Heat treatment process of steel (before workpiece machining):

[0032] Normalizing treatment: When the steel is heated to a temperature of 875°C in the furnace, it is kept for 1 hour, and the steel is cooled by a fan in the air after it is released from the furnace.

[0033] Annealing treatment: heat the steel in the furnace to a temperature of 705°C for 1 hour, then heat it to a temperature of 765°C for 3 hours, then cool it down to a temperature of 685°C for 4 hours, and finally cool it at a rate of 30°C / h to At 580°C, cool with the furnace.

[0034] 3. Heat treatment process of semi-finished products after workpiece machining:

[0035] Quenching treatment: When the workpiece is...

Embodiment 3

[0038] 1. The chemical composition of another embodiment of the bearing steel of the present invention is (weight percentage): C: 0.80%, Si: 0.65%, Mn: 1.10%, Cr: 0.65%, Mo: 0.01%, P: 0.020%, S: 0.015%, Ni: 0.08%, Cu: 0.01%, Ni+Cu: 0.09%, and the rest are Fe and unavoidable impurities.

[0039] 2. Heat treatment process of steel (before workpiece machining):

[0040] Normalizing treatment: When the steel is heated to a temperature of 880°C in the furnace, it is kept for 1 hour, and the steel is cooled by a fan in the air after it comes out of the furnace.

[0041] Annealing treatment: heat the steel in the furnace to 710°C for 1 hour, then heat it to 770°C for 3 hours, then cool it down to 690°C for 4 hours, and finally cool it down to 30°C / h. At 600°C, cool with the furnace.

[0042] 3. Heat treatment process of semi-finished products after workpiece machining:

[0043] Quenching treatment: When the workpiece is heated in the furnace to a temperature of 800°C, it is kept f...

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PUM

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Abstract

The invention discloses a novel bearing steel and a technology for heating processing, wherein the bearing steel comprises chemical composition (by weight percent): 0.70-0.80% of C, 0.55-0.65% of Si, 1.00-1.10% of Mn, 0.50-0.65% of Cr, not more than 0.10% of Mo, not more than 0.025% of P, not more than 0.025% of S, not more than 0.30% of Ni, not more than 0.25% of Cu, not more than 0.50% of Ni+Cu as well as balance Fe and unavoidable impurities. The technology for heating processing of the bearing steel comprises steel heating processing technique and semi-finished product heating processing technique after mechanical processing of workpieces. The invention can improve the processing accuracy of steel, impact toughness and fatigue life.

Description

technical field [0001] The invention belongs to the technical field of metal materials and heat treatment, in particular to a novel bearing steel and a heat treatment process. Background technique [0002] High-carbon chromium bearing steel GCr15 (1.0-C, 1.5-Cr) is the most widely used bearing steel variety in various countries for more than 100 years. The main reason is that it has excellent rolling fatigue performance, high hardness and good wear resistance. However, there is a certain amount of coarse eutectic carbides in the crystalline structure of GCr15 steel, which often leads to a significant reduction in rolling fatigue life and strength and toughness. Then thermal processing. At present, the continuous casting GCr15 bearing steel produced in my country is limited by the production equipment, and the high-temperature diffusion annealing time is far from enough, so the banded carbides of the bearing steel are often on the line required by the GB / T18254 standard, or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C21D1/28C21D1/26C21D1/18
Inventor 雷建中梅亚莉叶健熠高元安仇亚军梁华扈林庄王煜哲
Owner LUOYANG BEARING SCI & TECH CO LTD
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