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Rolling method of 22CrMoH gear steel

A gear steel and gear technology, applied in the field of gear steel, can solve the problems of steel billet breakage, increased production difficulty, and increased material cost

Active Publication Date: 2017-10-03
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, microalloying increases the cost of materials and increases the difficulty of production. For example, after the addition of Nb and Ti microalloys, there is a high-temperature brittle zone in the gear steel. During the rolling process, the precipitation of Ti and Nb elements at the grain boundaries leads to weak grain boundaries. The accident of steel billet breakage, resulting in a large amount of waste products
Therefore, the scheme of using microalloying elements to refine grains is not very ideal in the field of gear steel
[0004] In addition, automobiles have continuously increased requirements for the stable service of the transmission system. The tooth surface is subjected to multi-directional forces during the tooth surface meshing process. At present, there are differences in the mechanical properties of the gear steel in the transverse and longitudinal directions, which leads to premature wear or fracture of the tooth surface in one direction. Therefore, in order to To ensure stable service, the automotive transmission system has a strong demand for gear steel with small anisotropy difference

Method used

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  • Rolling method of 22CrMoH gear steel
  • Rolling method of 22CrMoH gear steel
  • Rolling method of 22CrMoH gear steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A rolling method of 22CrMoH gear steel, comprising the following steps:

[0040] (1) Put the continuous casting slab containing the chemical composition and mass percentage shown in Example 1 in Table 1 below 850°C into the heating furnace, and heat it to the soaking temperature after 4 hours. The temperature in the soaking section is 1170-1220°C, After heat preservation for 4 hours, it leaves the heating furnace, and the heated continuous casting slab is dephosphorized by high-pressure water to remove iron oxide scale;

[0041] (2) The round steel billet after dephosphorization is subjected to billeting to obtain a blooming billet, the billeting temperature is 1000-1050°C, and the deformation in a single pass of billeting is greater than 20%;

[0042] (3) The blooming slab is rolled in a continuous rolling mill, and the continuous rolling temperature is 850-950°C, wherein the rolling deformation at 870-920°C is greater than 30%, and the final rolling temperature is 850...

Embodiment 2

[0048] A rolling method of 22CrMoH gear steel, comprising the following steps:

[0049] (1) Put the continuous casting slab containing the chemical composition and mass percentage shown in Example 2 in Table 1 below 850°C into the heating furnace, and heat it to the soaking temperature after 4 hours. The temperature in the soaking section is 1150-1200°C, After heat preservation for 4 hours, it leaves the heating furnace, and the heated round steel billet is dephosphorized by high-pressure water to remove iron oxide scale;

[0050] (2) The continuous casting slab after dephosphorization is carried out to obtain the blooming slab, the temperature of the slab is 1000-1050 ℃, and the deformation of the single pass of the slab is greater than 20%;

[0051] (3) The blooming slab is rolled in a continuous rolling mill, and the continuous rolling temperature is 830-930°C, wherein the rolling deformation at 860-900°C is greater than 30%, and the final rolling temperature is 830°C;

[...

Embodiment 3

[0057] A rolling method of 22CrMoH gear steel, comprising the following steps:

[0058] (1) Put the continuous casting slab containing the chemical composition and mass percentage shown in Example 3 in Table 1 below 850°C into the heating furnace, and heat it to the soaking temperature after 4 hours. The temperature in the soaking section is 1140-1180°C, After heat preservation for 4 hours, it leaves the heating furnace, and the heated round steel billet is dephosphorized by high-pressure water to remove iron oxide scale;

[0059] (2) The continuous casting slab after dephosphorization is carried out to obtain the blooming slab, the temperature of the slab is 1000-1050 ℃, and the deformation of the single pass of the slab is greater than 20%;

[0060] (3) The blooming slab is rolled in a continuous rolling mill, and the continuous rolling temperature is 800-900°C, wherein the rolling deformation at 870-900°C is greater than 30%, and the final rolling temperature is 800°C;

[...

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Abstract

The invention discloses a rolling method of 22CrMoH gear steel. The rolling method is characterized in that through the adjustment on the cogging temperature, the final rolling temperature, the finish rolling temperature, the pass deformation and the controlled cooling technology, the length-width ratio of the MnS inclusion is effectively reduced, the hot-rolling structure of the gear steel obtained by adopting the rolling method is a flat austenite structure, the size of precipitated phases is 20-25 nm, and the weight percentage of the precipitated amount is 0.31-0.38%; besides, after heat treatment, the austenite crystal grain size is 5-7 [Mu]m, and the longitudinal impact toughness ratio is close to 1.

Description

technical field [0001] The invention belongs to the field of gear steel, and in particular relates to a rolling method of 22CrMoH gear steel. Background technique [0002] 22CrMoH steel is one of the most commonly used gear steels at home and abroad. It is widely used in the manufacture of important gears in automobile transmission systems. With the increasing production and consumption of automobiles, the pressure on resources, environment and energy is also increasing. Therefore, it is urgent to improve the performance of automobiles, including weight reduction and longevity. The improvement of the performance of the automobile transmission system is very important to the long life and weight reduction of the automobile, so it is of great significance to improve the comprehensive performance of the automobile gear steel. [0003] Grain refinement is an important way to improve the comprehensive performance of automotive gear steel. At present, the microalloying method is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/16B21B37/74C21D8/00C22C38/02C22C38/04C22C38/06C22C38/22
CPCB21B1/16B21B37/74B21B2201/02C21D8/005C21D2211/001C22C38/02C22C38/04C22C38/06C22C38/22
Inventor 胡芳忠汪开忠孙维龚志翔于文坛许兴吴林
Owner MAANSHAN IRON & STEEL CO LTD
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