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MnCr-series gear steel as well as preparation method and application thereof

A technology of gear steel and molten steel, applied in the direction of belts/chains/gears, mechanical equipment, components with teeth, etc., can solve the problems of reducing the hardenability bandwidth and complicated production process, and achieve a small hardenability bandwidth , Small amount of deformation, simple operation steps

Inactive Publication Date: 2021-09-28
CHENGDE JIANLONG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production process is relatively complicated and does not involve reducing the hardenability bandwidth

Method used

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  • MnCr-series gear steel as well as preparation method and application thereof
  • MnCr-series gear steel as well as preparation method and application thereof
  • MnCr-series gear steel as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] This embodiment provides a kind of MnCr series gear steel. According to weight percentage, the MnCr series gear steel includes: C: 0.200%, Si: 0.1%, Mn: 1.3%, P: 0.018%, S: 0.022%, Cr: 1.2%, Ni: 0.25%, Cu: 0.18%, Al: 0.034%, N: 0.011%, B: 2ppm, and the balance is Fe and unavoidable impurities.

[0062] This embodiment also provides a preparation method of the MnCr series gear steel, such as figure 1 Shown, described preparation method comprises the following steps:

[0063] (1) Carry out converter steelmaking, ladle refining for 54 minutes and vacuum refining on the molten iron in sequence, wherein the first alloy is added to the converter steelmaking, and the first alloy includes aluminum ingots, low-carbon ferromanganese, low-carbon ferrochrome, and medium-carbon ferrochrome and recarburizer, add the second alloy and slagging material in ladle refining, the second alloy includes aluminum wire, low carbon ferromanganese, low carbon ferrochrome, medium carbon ferrochro...

Embodiment 2

[0066] This embodiment provides a kind of MnCr series gear steel. According to weight percentage, the MnCr series gear steel includes: C: 0.195%, Si: 0.12%, Mn: 1.28%, P: 0.020%, S: 0.025%, Cr: 1.18%, Ni: 0.30%, Cu: 0.20%, Al: 0.03%, N: 0.01%, B: 3ppm, and the balance is Fe and unavoidable impurities.

[0067] This embodiment also provides a preparation method of the MnCr series gear steel, the preparation method comprising the following steps:

[0068] (1) Carry out converter steelmaking, ladle refining for 55 minutes, and vacuum refining of molten iron in sequence, wherein the first alloy is added to the converter steelmaking, and the first alloy includes aluminum ingots, low-carbon ferromanganese, low-carbon ferrochrome, and medium-carbon ferrochrome and recarburizer, add the second alloy and slagging material in ladle refining, the second alloy includes aluminum wire, low carbon ferromanganese, low carbon ferrochrome, medium carbon ferrochrome and recarburizer, slagging ma...

Embodiment 3

[0071] This embodiment provides a kind of MnCr series gear steel. According to weight percentage, the MnCr series gear steel includes: C: 0.205%, Si: 0.12%, Mn: 1.32%, P: 0.020%, S: 0.025%, Cr: 1.22%, Ni: 0.30%, Cu: 0.20%, Al: 0.038%, N: 0.012%, B: 3ppm, and the balance is Fe and unavoidable impurities.

[0072] This embodiment also provides a preparation method of the MnCr series gear steel, the preparation method comprising the following steps:

[0073] (1) Carry out converter steelmaking, ladle refining for 53 minutes and vacuum refining on the molten iron in sequence, wherein the first alloy is added to the converter steelmaking, and the first alloy includes aluminum ingots, low-carbon ferromanganese, low-carbon ferrochrome, and medium-carbon ferrochrome , Carburizer, add the second alloy and slagging material in ladle refining, the second alloy includes aluminum wire, low carbon ferromanganese, low carbon ferrochrome, medium carbon ferrochrome and carburant, slagging mate...

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Abstract

The invention provides MnCr-series gear steel as well as a preparation method and application thereof. The MnCr-series gear steel is prepared from 0.19%-0.21% of C, less than or equal to 0.12% of Si, 1.28%-1.32% of Mn, less than or equal to 0.020% of P, less than or equal to 0.025% of S, 1.18%-1.22% of Cr, less than or equal to 0.30% of Ni, less than or equal to 0.20% of Cu, 0.030%-0.038% of Al, 0.010%-0.012% of N, less than or equal to 3 ppm of B and the balance Fe and inevitable impurities. The preparation method of the MnCr-series gear steel comprises the steps that converter steelmaking, ladle refining, vacuum refining, square billet continuous casting and bar rolling are performed in sequence. The composition proportion is strictly controlled, the ladle refining time is prolonged, the temperature is accurately controlled, steel segregation is controlled, the hardenability bandwidth of a finished product can be controlled to be 3 HRC or below, and the requirement for automobile transmission gear application is met.

Description

technical field [0001] The invention relates to the technical field of gear steel, in particular to a MnCr series gear steel and its preparation method and application. Background technique [0002] MnCr series low-carbon alloy gear steels are commonly used in the processing of automotive gearbox gears. Due to the increasingly stringent requirements on the running noise, vibration and harshness (NVH) and fatigue strength of automobiles in recent years, the performance indicators of gear steels are also becoming more and more stringent. High, among which the hardenability bandwidth is the most important technical index to measure the quality of gear steel, which directly determines the amount of deformation and the consistency of deformation direction after heat treatment of the gear, which in turn affects the requirements of gear running noise NVH and fatigue strength. [0003] CN112941279A discloses a heat treatment process for improving the hardenability and hardness of th...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/18C22C38/40C22C38/42C22C38/20C22C38/54C22C38/32C22C33/06F16H55/06F16H55/17
CPCC22C38/04C22C38/02C22C38/06C22C38/18C22C38/40C22C38/42C22C38/20C22C38/54C22C38/32C22C33/06F16H55/17F16H55/06
Inventor 张大伟王雪原巩飞尹修刚刘增平
Owner CHENGDE JIANLONG SPECIAL STEEL