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High-hardenability gear steel and manufacturing method thereof

A technology with high hardenability and manufacturing method, applied in the field of gear steel and its manufacturing, can solve the problems of unfavorable core hardness and fatigue life, unfavorable penetration layer stability, insufficient hardenability, etc.

Active Publication Date: 2018-07-31
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 1) Insufficient hardenability is not conducive to obtaining appropriate core hardness and improving fatigue life, resulting in low strength;
[0010] 2) Poor thermal processing performance;
[0011] 3) The austenite grain size is unstable, and it is easy to produce mixed crystals, which is not conducive to the stability of the infiltrated layer

Method used

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  • High-hardenability gear steel and manufacturing method thereof
  • High-hardenability gear steel and manufacturing method thereof
  • High-hardenability gear steel and manufacturing method thereof

Examples

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Embodiment A1-A8 and comparative example B1 and B2

[0077] Table 1 lists the mass percentages of various chemical elements in the high hardenability gear steels of Examples A1-A8 and the conventional gear steels of Comparative Examples B1 and B2.

[0078] Table 1. (wt%, the balance is Fe and other unavoidable impurities except P, S, O and H)

[0079]

[0080] The manufacturing method of the high hardenability gear steel of embodiment A1-A8 and the conventional gear steel of comparative example B1 and B2 adopts the following steps to make:

[0081] (1) Primary smelting in electric furnace: the primary smelting of molten steel is carried out in an electric arc furnace of 60-150 tons, during the oxidation period, the slag is frequently flowed to remove P, and the tapping temperature is controlled to be ≥1650°C;

[0082] (2) Ladle refining and vacuum degassing: After the initial deoxidation of LF, add an alloy block and stir for 5-10 minutes. When the temperature of the molten steel is ≥1650°C, enter the vacuum position for dega...

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Abstract

The invention discloses high-hardenability gear steel. The high-hardenability gear steel comprises the chemical elements of, by mass, 0.19-0.25% of C, 0.15-0.35% of Si, 0.70-1.05% of Mn, 0.70-0.80% ofCr, 0.40-0.65% of Ni, larger than 0 and less than or equal to 0.20% of Cu, 0.33-0.40% of Mo, 0.020-0.050% of Al, 0.003-0.010% of Ti, 0.05-0.08% of b, 0.0001-0.0003% of B, 0.0080-0.0150% of N, and thebalance Fe and other inevitable impurities. The invention further discloses a gear which is obtained through the high-hardenability gear steel. In addition, the invention further discloses a manufacturing method of the high-hardenability gear steel. The high-hardenability gear steel is high in strength and good in toughness.

Description

technical field [0001] The invention relates to a steel grade and a manufacturing method thereof, in particular to a gear steel and a manufacturing method thereof. Background technique [0002] The drive axle gear of a commercial vehicle is used to transmit power and drive the vehicle forward. The gear has a large modulus and bears a large load. This gear requires high bending strength and high contact fatigue strength. In order to meet high bending strength The requirements of the requirements require that the steel has a high hardenability of the carburized layer to ensure that the carburized layer of the gear can obtain more than 99% of the martensite structure after carburizing and quenching. The design of steel hardenability should ensure that the heat treatment deformation of the gear is small to ensure the correct meshing between the active tooth and the passive tooth. If the hardenability of the steel cannot guarantee the bending strength (or core hardness) of the ge...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/18C22C38/08C22C38/12C22C38/06C22C38/14C22C38/32C22C33/04
CPCC22C33/04C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/18C22C38/32
Inventor 安金敏蒋锡军黄宗泽丁毅
Owner BAOSHAN IRON & STEEL CO LTD
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