A kind of Crnimo high-strength gear steel and preparation method thereof

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,...

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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

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