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A crmo series gear round steel

A round steel and gear technology, applied in the manufacturing field of CrMo series gear round steel, can solve the problem of high production cost of gear steel, and achieve the effect of reducing internal oxidation tendency, reducing production cost and improving competitiveness.

Active Publication Date: 2018-07-24
BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, at present, the hardenability of gear steel is mainly improved by adding a large amount of Cr, Mo, Ni and other alloys, which makes the production cost of gear steel remain high.

Method used

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  • A crmo series gear round steel
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Embodiment Construction

[0011] Below in conjunction with embodiment the present invention is further described.

[0012] A Cr-Mo series gear round steel, its composition and weight percentage (Wt%) are: C: 0.22-0.27%, Si: 0.03-0.12%, Mn: 1.20-1.45%, S≤0.020%, P≤ 0.020%, Cr: 0.30-0.60%, Mo: 0.10-0.18%, Al: 0.015-0.040%, Ni≤0.10%; residual element O≤15×10 -6 , the rest is Fe and some other trace residual elements. At the same time, in order to ensure the hardenability, the DI value in the steel is controlled within the range of 50-70mm through narrow-band control of the chemical composition.

[0013] According to the composition design of the plan, converter smelting, LF refining, RH refining and continuous casting of blooms are adopted. The smelted steel billets are heated and rolled into 60mm, 90mm and 110mm round steel, of which 90mm and 110mm round steel After rolling, it is hung into the slow cooling pit and slowly cooled to below ≤200°C before exiting the pit. The chemical composition, perform...

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Abstract

The invention relates to a manufacturing method of CrMo gear round steel. The CrMo gear round steel is characterized by comprising the following components in percentage by weight: 0.22-0.27% of C, 0.03-0.12% of Si, 1.20-1.45% of Mn, S not more than 0.020%, P not more than 0.020%, 0.30-0.60% of Cr, Mo not more than 0.20%, 0.015-0.040% of Al, Ni not more than 0.10%, O not more than 15*10-6%, and the balance of Fe and inevitable impurities. A type and D type inclusions in the manufactured round steel are not higher than 1.5 grade; B type and C type inclusions are not higher than 1.0 grade; and the round steel has the following hardenability values: J5mm is 42-50 HRC; J9mm is 38-46 HRC; and J15mm is 32-40 HRC. The traditional technical thought of improving the steel hardenability by adding a lot of alloy elements as Cr, Ni and Mo is changed; the C and Mn contents are properly increased to largely reduce the content of Mo and the content of Cr; a Ni alloy is replaced; and under the precondition of not reducing the hardenability of gear steel, the product production cost is largely reduced, and the product competitiveness is improved.

Description

technical field [0001] The invention belongs to the technical field of gear steel smelting, and relates to a method for manufacturing CrMo series gear round steel. Background technique [0002] With the progress of automobile manufacturing, automobile gears are developing in the direction of low cost, quiet noise, and long life, and the requirements for materials are also continuously increasing. Materials are required to have good processing performance, narrow hardenability zone, and high fatigue life. Wait. Gear steel mainly relies on the addition and proportion of alloying elements such as Mn, Cr, Mo, Ni to ensure that the hardenability is controlled in a suitable range. At present, there are CrMo series such as 20CrMoH, 22CrMoH, CrMnMo series such as 20CrMnMoH, and CrNiMo series. Such as 20CrNiMoH, 22CrNiMoH, etc. [0003] Publication No. CN104372258A, an invention patent named "A CrNiMo high-strength gear steel and its preparation method", the main components of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/18C22C38/06C22C38/02C22C38/04C22C38/12C22C38/08
CPCC22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/18
Inventor 刘年富岳峰吴学兴钟凡刘锦标
Owner BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
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