20Cr2Ni4 gear steel and production technology thereof

A production process and gear steel technology, applied in the field of steel, can solve problems such as hardenability, thermal strength, grain size, and strength that cannot be satisfied, and achieve the effect of reducing inclusions and improving steel strength

Inactive Publication Date: 2017-07-21
CHONGQING JINKAI SPECIAL STEEL PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical composition of the steel: C0.17-0.23%, Si0.17-0.37%, Mn0.30-0.60%, Cr1.25-1.65%, Ni3.25-3.65%, Mo≤0.10%. With the continuous upgrading of product quality and requirements, accor

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In the embodiment of the present invention, a 20Cr2Ni4 gear steel is made of 20Cr2Ni4. First of all, batching is carried out according to the planned output. When batching, the weight of the charge is added according to the Mo content detected by the source of the material. 0.15% of Mo is added to the charge. During the smelting process of the electric arc furnace, the molten steel is melted and the temperature reaches 1580°C. Samples are taken for detection and analysis. Detect Mo0.18%; during the smelting process of the refining furnace, the temperature reaches 1580 ℃, and the slag and white slag are detected and analyzed, and then further micro-adjusted, and the Mo0.17% of the finished steel product is in line with the control range.

Embodiment 2

[0018] In the embodiment of the present invention, a 20Cr2Ni4 gear steel is made of 20Cr2Ni4. First of all, batching is carried out according to the planned output. When batching, the weight of the charge is added according to the Mo content detected by the source of the material. Mo0.26% is added to the charge. During the smelting process of the electric arc furnace, the molten steel is melted and the temperature reaches 1580 ° C. Samples are taken for detection and analysis. Detect Mo0.30%; during the smelting process of the refining furnace, the temperature reaches 1580 ℃, and the slag and white slag are detected and analyzed, and then further micro-adjusted, and the Mo0.29% of the finished steel product is in line with the control range.

Embodiment 3

[0020] In the embodiment of the present invention, a 20Cr2Ni4 gear steel is made of 20Cr2Ni4. First of all, batching is carried out according to the planned output. When batching, the weight of the charge is added according to the Mo content detected by the source of the material. Mo0.27% is added to the charge. During the smelting process of the electric arc furnace, the molten steel is melted and the temperature reaches 1580 ° C. Samples are taken for detection and analysis. Detect Mo0.30%; during the smelting process of the refining furnace, the temperature reaches 1580 ℃, and the slag and white slag are detected and analyzed, and then further micro-adjusted, and the Mo0.30% of the finished steel product is in line with the control range.

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PUM

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Abstract

The invention discloses 20Cr2Ni4 gear steel and a production technology thereof. The 20Cr2Ni4 gear steel is made of 20Cr2Ni4, and the mass percentage of Mo in the 20Cr2Ni4 is 0.15-0.30%. The production technology comprises the steps of burdening, smelting in an electric arc furnace and smelting in a refining furnace, wherein in the smelting process in the electric arc furnace, steel is molten, the temperature reaches 1570-1590 DEG C, and sampling is carried out for detection analysis so as to enable the mass percentage of the Mo to reach 0.15-0.30%; and in the smelting process in the refining furnace, the temperature reaches 1570-1590 DEG C, and sampling is carried out for detection analysis so as to enable the mass percentage of the Mo to reach 0.15-0.30%. According to the 20Cr2Ni4 gear steel and the production technology thereof, impurities in the steel are reduced, the content of H, O and N gas in the steel is reduced, the harmful elements such as P, S, As and Sn in the steel are reduced, a proper amount of the Mo is added, and therefore the steel can be used for parts such as a large gear and a shaft, and the comprehensive performance such as the hardenability, the heat resistance, the grain refinement performance and the steel strength improvement performance can be improved.

Description

technical field [0001] The invention relates to the technical field of steel materials, in particular to a 20Cr2Ni4 gear steel and a production process thereof. Background technique [0002] 20Cr2Ni4 is a high-strength alloy carburizing steel with good comprehensive mechanical properties, and its hardenability, strength and toughness are all higher than 12CrNi3 steel. The forging performance of this steel is good, the forging heating temperature is 1200°C, the initial forging temperature is 1150°C, the final forging temperature is greater than 850°C, and it is cooled slowly after forging. If 20Cr2Ni4 steel has coarse grains after forging, even after normalizing and subsequent carburizing heating, coarse martensite structure will still be obtained after quenching. It is used for large cross-section carburized parts, such as large gears, shafts, and quenched and tempered parts that require high strength and good toughness. The chemical composition of the steel: C0.17-0.23%, ...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C38/02C22C38/04C21C5/52
CPCC21C5/52C22C38/02C22C38/04C22C38/44Y02P10/20
Inventor 崔建珍颜永辉赵永勇
Owner CHONGQING JINKAI SPECIAL STEEL PROD
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