CrNiMo high-strength pinion steel and preparation method thereof

A gear steel, high-strength technology, applied in the direction of improving process efficiency, can solve the problems of inability to meet the performance requirements of heavy-duty automobiles and large shaft tooth parts, unsatisfactory hardenability control, and large fluctuations in end hardenability. , to achieve the effect of improving process performance and heat treatment, low band structure level, and improving heat treatment performance

Active Publication Date: 2015-02-25
SHANDONG IRON & STEEL CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0006] In view of the unsatisfactory hardenability control exposed during the production and use of Cr-Mn-Ti series gear steels (representative steel grade 20CrMnTiH and its sub-grades), large fluctuations in end hardenability and low hardenability, Can not meet the performance requirements of heavy-duty vehicles and large shaft and tooth parts, etc., the present invention provides a CrNiMo high-strength gear steel and its preparation method

Method used

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  • CrNiMo high-strength pinion steel and preparation method thereof
  • CrNiMo high-strength pinion steel and preparation method thereof
  • CrNiMo high-strength pinion steel and preparation method thereof

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Embodiment 1

[0039] The following examples are used to illustrate the present invention, but the protection scope of the present invention is not limited to the following examples.

[0040] The production process is: batching→electric arc furnace smelting→LF refining furnace refining→VD vacuum refining furnace refining→bloom continuous casting→semi-continuous rolling mill rolling.

[0041] In order to ensure the economy of low-nickel pig iron electric furnace smelting, optimize the batching structure, increase the amount of low-nickel pig iron added, and adopt the solid batching mode; low-nickel pig iron is blended according to the middle and lower limits of the nickel element specification of the steel grade, and the nickel yield is calculated as 100%. Arrangement of charging The low-nickel pig iron cloth is placed around the large material and close to the bottom of the material frame, but avoids the furnace door to prevent splashing during melting.

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Abstract

The invention relates to a CrNiMo high-strength pinion steel and a preparation method thereof. The pinion steel comprises the following chemical components in percentage by mass: 0.19%-0.25% of C, 0.17%-0.37% of Si, 0.70%-1.00% of Mn, at most 0.030% of P, at most 0.030% of S, 0.85%-1.25% of Cr, 0.40%-0.70% of Ni, 0.30%-0.40% of Mo, 0.015%-0.050% of Al, at most 2.5*10<-4>% of H, 30*10<-4>%-80*10<-4>% of N, at most 15*10<-4>% of T.O, and the balance of Fe and inevitable impurities. The invention also provides a preparation method of the pinion steel. The nickel molybdenum alloy is added to improve the heat treatability of the material, thereby ensuring the mechanical properties of the material. The hardenability of the material is enhanced, and the material satisfies the performance requirements for large module pinions.

Description

technical field [0001] The invention relates to CrNiMo high-strength gear steel and a preparation method thereof, belonging to the technical field of alloy steel gear steel smelting. Background technique [0002] Gear steel is one of the key materials used in a large amount of automotive materials and has high requirements. It not only affects the technical and economic indicators such as vehicle life and energy consumption, but is also crucial to meeting safety, environmental protection and comfort requirements. [0003] Since the 1980s, my country has planned to introduce various advanced models from industrially developed countries, and various foreign advanced medium and heavy-duty trucks have also been continuously introduced. At the same time, major automobile manufacturers in my country cooperate with famous foreign automobile companies to introduce foreign advanced automobile production technology, including the production technology of automobile gears. At present,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C21C7/076
CPCC22C38/001C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/18Y02P10/20
Inventor 翟正龙郑桂芸刁峰欧阳峥容裴建华李泰许倩卢栋于辉
Owner SHANDONG IRON & STEEL CO LTD
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