NbTi composite microalloyed free-cutting pinion steel

A technology of microalloying and gear steel, which is applied in the field of alloy steel, can solve problems such as difficult processing and contact fatigue, and achieve the effects of improving fatigue performance, refining grains, and solving difficult processing

CN101603151BInactive Publication Date: 2012-07-18CHINA FIRST AUTOMOBILE
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2012-07-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to NbTi composite microalloyed free-cutting pinion steel which is characterized in that Mn-Cr-Ti-Nb-S pinion steel comprises the following chemical compositions in percentage by weight: 0.20-0.25 percent of C, 0.15-0.35 percent of Si, 1.00-1.30 percent of Mn, 0.00-0.035 percent of P, 0.01-0.035 percent of S, 1.10-1.40 percent of Cr, 0.02-0.05 percent of Ti, 0.02-0.04 percentof Nb, 0.00-0.0020 percent of O and the balance of Fe. The NbTi composite microalloyed free-cutting pinion steel solves the problems of contact fatigue life caused by more titanium impurities and difficult processing, achieves the grain refining effect and increases the fatigue performance of pinions.
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Description

Technical field:

[0001] The invention relates to an NbTi composite microalloyed easy-cutting gear steel, in particular to an easy-cutting Mn-Cr-Ti-Nb-S gear steel for rear axle gears which has strict requirements on carburizing and quenching deformation, and belongs to the field of alloy steel . Background technique:

[0002] With the increase of the power of the automobile engine, the transmission system is required to be able to withstand higher loads. At the same time, in order to increase the power density (output work per unit volume), the volume of the transmission system is required to be reduced, so a higher load-carrying capacity of the gear is proposed. The traditional 20CrMnTi steel can no longer meet the requirements. In order to improve the load-carrying capacity of gears, heavy-duty gear steels with high alloy element content are often used as gear materials, such as 22CrMoH and 20CrNiMoH gear steels. However, these heavy-duty gear steels are expensive. High, ...

Examples

Embodiment 1

[0009] Gear steel includes the following chemical composition by weight percentage C: 0.25%, Si: 0.29%, Mn: 1.14%, P0.017%, S: 0.015%, Cr: 1.19%, Ti: 0.053%, Nb: 0.032%, [ O]: 0.0010, Fe balance; smelted in a 150kg vacuum induction furnace.

Embodiment 2

[0011] The gear steel includes the following chemical components by weight percentage C: 0.23%, Si: 0.30%, Mn: 1.05%, P0.012%, S: 0.017%, Cr: 1.15%, Ti: 0.045%, Nb: 0.030%, [ O]: 0.0012, Fe balance; smelted in a 150kg vacuum induction furnace.

Embodiment 3

[0013] Gear steel includes the following chemical components by weight percentage C: 0.21%, Si: 0.32%, Mn: 1.10%, P0.008%, S: 0.018%, Cr: 1.20%, Ti: 0.036%, Nb: 0.033%, O : 0.0014, Fe balance; smelted with a 150kg vacuum induction furnace.