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A kind of low-silicon medium-carbon gear steel suitable for cold forging and its manufacturing method

A carbon gear steel and cold forging technology, applied in the field of gear steel and its manufacturing, can solve problems such as difficulty in meeting cold forging process requirements

Active Publication Date: 2022-04-29
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The cold forging process has strict requirements on raw materials, and ordinary steel for hot forging is difficult to meet the requirements of the cold forging process for steel

Method used

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  • A kind of low-silicon medium-carbon gear steel suitable for cold forging and its manufacturing method
  • A kind of low-silicon medium-carbon gear steel suitable for cold forging and its manufacturing method
  • A kind of low-silicon medium-carbon gear steel suitable for cold forging and its manufacturing method

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Experimental program
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Effect test

Embodiment 2

[0045] The smelting uses electric furnace + refining furnace + VD furnace to smelt 100 tons of steel with the chemical composition shown below, and uses continuous casting to make continuous casting slabs with a cross-sectional size of 300mm×340mm. The chemical composition of the obtained continuous casting slabs includes: : C: 0.41%, Si: 0.05%, Mn: 0.52%, Cr: 0.37%, P: 0.011%, S: 0.017%, Al: 0.019%, N: 0.008%, Cu: 0.02%, Ni: 0.02% , Mo: 0.01%, B: 0.0016%, Ti: 0.004%, [O]: 0.0010%, (Cu+Ni+Mo): 0.05%, and the balance is Fe and unavoidable impurity elements.

[0046] The continuous casting slab needs to be heated to 1140°C, and the slab is kept warm for 4 hours before leaving the heating furnace. The air-to-coal ratio of the heating gas is in the range of 1.01-1.07. Rolling is carried out after descaling with high-pressure water: the starting rolling temperature is 1050°C, and the final rolling The temperature is 920°C. After the final rolling, the steel is slowly cooled with a ...

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Abstract

The invention relates to a low-silicon medium-carbon gear steel suitable for cold forging and a manufacturing method thereof. The elemental components of the steel are C: 0.35-0.45%, Si: ≤0.08%, and Mn: 0.30-0.60% by mass percentage , Cr: 0.20~0.50%, P: ≤0.020%, S: 0.010~0.040%, Cu: ≤0.10%, Ni: ≤0.05%, Mo: ≤0.05%, Al: ≤0.050%, N: ≥0.005% , B: 0.0005-0.0035%, Ti: ≤0.010%, [O]: ≤0.0020%, (Cu+Ni+Mo): ≤0.15%, and the balance is Fe and unavoidable impurity elements. The forming specification is φ45mm~φ90mm round steel, and the dimensional accuracy is ≤±0.15mm. According to GB / T 4162‑2008, the internal ultrasonic flaw detection of round steel meets the requirements of Class A. The outer layer on the section of the round steel is a partially decarburized layer, the depth of the partially decarburized layer is ≤ 0.5%d of the nominal diameter of the round steel, the core is the matrix structure, the matrix structure is ferrite + spheroidized pearlite, and the spheroidization rate reaches more than 90 percent.

Description

technical field [0001] The invention belongs to the technical field of iron-based alloys, in particular to a gear steel and a manufacturing method thereof. Background technique [0002] The cold forging process is a precision plastic forming technology. Compared with the traditional hot forging process, the cold forging process has many advantages such as high production efficiency, good dimensional accuracy, high raw material utilization rate and low production cost, and the cold forging process is particularly suitable for Mass production of special-shaped parts. [0003] The cold forging process has strict requirements on raw materials, and ordinary steel for hot forging is difficult to meet the requirements of the cold forging process for steel. Steel for cold forging must have higher dimensional accuracy and shallower decarburization depth than steel for hot forging, and it is necessary to control the hardness and spheroidization rate of steel after spheroidizing annea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/50C22C38/54C21D1/26C21D6/00C21D8/06C21D9/52C22C33/04
CPCC22C38/02C22C38/04C22C38/002C22C38/42C22C38/44C22C38/06C22C38/001C22C38/54C22C38/50C22C33/04C21D1/26C21D6/004C21D6/005C21D6/008C21D8/065C21D9/525C21D2211/005C21D2211/009
Inventor 张学诚孙鸿平刘子铭张永启鲍俭申菊凤
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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