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Production method of A485-2 hardened bearing steel forge piece

A production method and technology of bearing steel, applied in metal processing equipment and other directions, can solve the problems such as the inability to eliminate the network carbide and the easy generation of cracks.

Inactive Publication Date: 2022-01-28
ZHANGJIAGANG HAIGUO HEAVY FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used bearing steel forgings in China will have serious network carbide structure during the forging process, and the severe network carbides cannot be co

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The production method of the A485-2 hardened bearing steel forging in the present embodiment, the production steps are as follows:

[0016] Cutting: Take the chemical composition and weight percentage as follows: C:0.85%, Si:0.9%, Mn:1.4%, P:≤0.015%, S:≤0.015%, Cr:1.4%, Mo:≤0.1%, Ni: ≤0.25%, Al: 0.012%, Cu: ≤0.3%, Pb: ≤0.002%, Ti: ≤0.005%, Sn: ≤0.02%, As: ≤0.015%, Sb: ≤0.015%, O: ≤ 8ppm, the steel billet with the balance of Fe is the raw material; all kinds of non-metallic inclusions in the billet should meet the following requirements: Class A inclusions: fine ≤ 2.5, thick ≤ 1, B class inclusions: fine ≤ 1.5 , thick series ≤ 0.5, no C-type inclusions, D-type inclusions level: thin series ≤ 1.0, thick series ≤ 0.5, Ds-type inclusions level ≤ 1.5;

[0017] Forging: Preheat the billet and place it in the forging furnace, heat the billet evenly to 1130°C at a heating rate not higher than 125°C / h and keep it warm for 5-6 hours, then forge the billet, the initial forging te...

Embodiment 2

[0021] The production method of the A485-2 hardened bearing steel forging in the present embodiment, the production steps are as follows:

[0022] Cutting: Take the chemical composition and weight percentage as follows: C:0.9%, Si:0.95%, Mn:1.6%, P:≤0.015%, S:≤0.015%, Cr:1.6%, Mo:≤0.1%, Ni: ≤0.25%, Al: 0.03%, Cu: ≤0.3%, Pb: ≤0.002%, Ti: ≤0.005%, Sn: ≤0.02%, As: ≤0.015%, Sb: ≤0.015%, O: ≤ 8ppm, the steel billet with the balance of Fe is the raw material; all kinds of non-metallic inclusions in the billet should meet the following requirements: Class A inclusions: fine ≤ 2.5, thick ≤ 1, B class inclusions: fine ≤ 1.5 , thick series ≤ 0.5, no C-type inclusions, D-type inclusions level: thin series ≤ 1.0, thick series ≤ 0.5, Ds-type inclusions level ≤ 1.5;

[0023] Forging: Preheat the billet and place it in the forging furnace, heat the billet evenly to 1140°C at a heating rate not higher than 125°C / h and keep it warm for 5-6 hours, then forge the billet, the initial forging tem...

Embodiment 3

[0027] The production method of the A485-2 hardened bearing steel forging in the present embodiment, the production steps are as follows:

[0028] Cutting: Take the chemical composition and weight percentage as follows: C: 1%, Si: 1.05%, Mn: 1.7%, P: ≤0.015%, S: ≤0.015%, Cr: 1.8%, Mo: ≤0.1%, Ni: ≤0.25%, Al: 0.05%, Cu: ≤0.3%, Pb: ≤0.002%, Ti: ≤0.005%, Sn: ≤0.02%, As: ≤0.015%, Sb: ≤0.015%, O: ≤ 8ppm, the steel billet with the balance of Fe is the raw material; all kinds of non-metallic inclusions in the billet should meet the following requirements: Class A inclusions: fine ≤ 2.5, thick ≤ 1, B class inclusions: fine ≤ 1.5 , thick series ≤ 0.5, no C-type inclusions, D-type inclusions level: thin series ≤ 1.0, thick series ≤ 0.5, Ds-type inclusions level ≤ 1.5;

[0029] Forging: Preheat the billet and place it in the forging furnace, heat the billet evenly to 1145°C at a heating rate not higher than 125°C / h and keep it warm for 5-6 hours, then forge the billet, the initial forgin...

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Abstract

The invention discloses a production method of an A485-2 hardened bearing steel forge piece. The production method comprises the following steps: selecting a steel billet for blanking; forging, in which the steel billet is heated to 1140 +/-10 DEG C and subjected to heat preservation, during forging, the initial forging temperature is 1140 +/-10 DEG C, the final forging temperature is 930-940 DEG C, the total forging ratio is larger than or equal to 3.5: 1, the whole forging process is completed within two heating numbers, and air cooling is conducted to the room temperature; spheroidizing annealing: concretely, heating the forge piece to 790 DEG C and preserving heat, then slowly cooling the forge piece to 720 DEG C in a furnace at a cooling speed not higher than 25 DEG C/h and preserving heat, then cooling the forge piece to 500 DEG C along with the furnace, and finally discharging and air-cooling the forge piece to room temperature; and nondestructive inspection. The method has the advantages that by optimizing the element ratio, the forging process and the spheroidizing annealing process, the defects that the interior of the forge piece is loose, cracks exist, and the structure is thick can be effectively overcome, and the comprehensive performance is improved.

Description

technical field [0001] The invention relates to a method for producing A485-2 hardened bearing steel forgings. Background technique [0002] The life and reliability of bearings are very critical. It needs high resistance to plastic deformation, high resistance to friction and wear, high rotation accuracy and dimensional accuracy, and good dimensional stability. Under some special requirements, it also needs to be durable. High temperature, low temperature, anti-corrosion and anti-magnetic properties, etc. How to meet the above conditions, the most fundamental condition is to make the bearing forging matrix meet the requirements, that is, the bearing steel forging matrix needs to have good carbide size, pearlite quantity, and network carbide. At present, the commonly used bearing steel forgings in China will have serious network carbide structure during the forging process, and the severe network carbides cannot be completely eliminated in the subsequent spheroidizing annea...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/50C22C38/58C22C38/60B21J5/00C21D1/32C21D6/00
CPCC22C38/02C22C38/04C22C38/06C22C38/44C22C38/58C22C38/42C22C38/60C22C38/50C22C38/002C22C38/008B21J5/002C21D1/32C21D6/004C21D6/005C21D6/008
Inventor 盛雪华赵玉宝尧伟
Owner ZHANGJIAGANG HAIGUO HEAVY FORGING
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