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Round steel for gear and preparation method thereof

A round steel and gear technology, applied in the field of round steel for gears and its preparation, can solve the problems of difficult control, wide hardenability bandwidth of gear steel, difficult to achieve stable control, etc., and reduce the influence of hardenability uniformity , Improve round steel C segregation and ensure the effect of austenite grain size

Active Publication Date: 2020-02-11
BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, for the 20CrMnTiH gear steel produced in China, the end hardenability bandwidth of the gear steel is usually large, and it is difficult to control it within the range of ≤4HRC; and the existing research mainly relies on the design and internal control of the chemical composition of the steel to achieve the quenching of the gear steel. The control of the permeability bandwidth is difficult to achieve stable control

Method used

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  • Round steel for gear and preparation method thereof
  • Round steel for gear and preparation method thereof
  • Round steel for gear and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of round steel for gear, its chemical composition and size other than iron are as shown in table 1, and its preparation method comprises:

[0039] S1. Converter smelting.

[0040] S2. Ladle refining: Feed aluminum wire for deoxidation within 10 minutes of the beginning of refining, control the feeding amount of aluminum wire per 130t of molten steel to 100m, and then no longer feed aluminum wire.

[0041] S3. Vacuum degassing: Keep the treatment time ≥30min under a high vacuum with a pressure of ≤66.7Pa. During the degassing process, ferro-titanium alloy is added for titanium alloying treatment. After refining, blow argon softly for 20 minutes and stir to remove floating inclusions. things.

[0042] S4. Continuous casting: cast a continuous casting billet of 320*320mm, the electromagnetic stirring of the mold is combined with the electromagnetic stirring of the solidification end for stirring operation, and the specific process parameters are shown in Table 2. ...

Embodiment 2-3

[0045] A round steel for gears, which differs from Example 1 only in that: the chemical composition and size are different, see Table 1 for details; the continuous casting process parameters are different, see Table 2 for details.

Embodiment 4-5

[0047] A kind of round steel for gears, which differs from Example 1 only in that the chemical composition and size are different, please refer to Table 1 for details.

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Abstract

The invention provides round steel for a gear and a preparation method thereof, and belongs to the technical field of steelmaking. The round steel for the gear mainly comprises the following chemicalcomponents in percentage by mass: 0.18-0.22% of C, 0.80-1.00% of Mn, 1.05-1.15% of Cr, 0.035--0.045% of Ti, 0.0050-0.0070% of N, and the balance Fe. The diameter Di of the round steel for the gear is1.34-2.12 inches; the mass percentages of C, Mn, Cr and Ti are X1%, X2%, X3% and X4% in sequence; and Di is equal to -2.8.8 + 9.3X1 + 1.5X2 + 1.2X3-0.0043.0043X 4. The preparation method of the roundsteel for the gear performs smelting according to the components and the sizes. The round steel for the gear precisely controls the components of Ti and N, and effectively and stably controls the hardenability bandwidth to be not more than 4HRC through Di formula correction.

Description

technical field [0001] The present application relates to the technical field of steelmaking, in particular, to a round steel for gears and a preparation method thereof. Background technique [0002] Cr-Mn-Ti gear steel is one of the key materials for manufacturing automobile and motorcycle gears and bearings in my country. Among them, 20CrMnTiH gear steel is a good alloy carburizing steel, and its usage occupies the leading position in the domestic gear steel industry. status. The indicators to measure the quality level of gear steel mainly include hardenability, grain size and purity, among which the characteristics of hardenability are particularly important. Whether the hardenability of gear steel is stable directly affects the deformation of the steel after heat treatment, and the hardenability bandwidth The narrower it is, the more conducive to gear processing and improved meshing accuracy. With the development of the automobile industry, gear steel, as an important m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C38/28C22C38/20C22C38/06C22C38/04C22C38/02C22C33/04
CPCC22C33/04C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/20C22C38/28C22C38/32
Inventor 刘年富赵贺楠岳峰何果吴学兴钟凡
Owner BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
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