Demand Grows For Uns G41400 Steel To Manufacture New Energy Vehicle Gearboxes - China

When using UNS G41400 (ie SAE-AISI 4140) steel to manufacture gearboxes for new energy vehicles, it is necessary to comprehensively consider material properties, process requirements and industry trends.

The following are key analysis points: **Lightweight Challenge**

- Compared with 20CrMnTi (density 7.8g/cm³) commonly used in new energy vehicles, UNS G41400 steel has a similar density and needs to be reduced through topological optimization design, such as using hollow shafts and thin-walled gear structures, combined with finite element analysis to ensure rigidity.

**Cost Analysis**

- The raw material cost of UNS G41400 steel is about $800-1200/ton, and the heat treatment cost accounts for 15-20% of the total manufacturing cost.

Compared with DIN 18CrNiMo7-6, the material cost is reduced by about 25%, but the fatigue strength needs to be compensated by shot peening.

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**Industry Case**

- Tesla Cybertruck reduction gearbox uses modified UNS G41400 steel, which ensures uniform cross-section hardness by controlling hardenability (HRC45 at 8mm in the Jominy test), and the gear accuracy reaches AGMA 12 - Songshun specialized in Special Steel for almost 20 years.

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Company Contact:

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