Chengde Jianlong Officially Became a Qualified Supplier of BYD.

Published: Apr 11, 2025 11:13

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According to the official WeChat account of Jianlong Group, Chengde Jianlong recently received good news. The quality of its gear steel product samples, DL1920 and DL2020-series, successfully passed the product verification of BYD Co., Ltd. (hereinafter referred to as BYD) and was officially included in BYD's list of qualified suppliers, achieving direct supply. This breakthrough marks that Chengde Jianlong's technical level and product quality in the field of gear steel have been highly recognized by top domestic automotive manufacturers.

As a leading enterprise in the domestic NEV field, BYD has extremely high requirements for the technical level and product quality of its suppliers. BYD's technical team conducted on-site surveys at Chengde Jianlong's production line and gave high recognition to the company's tooling equipment, quality control, smart factory, safety production, and environmental protection measures.

In recent years, gear steel, as a pillar category among various types of automotive steel, has been continuously refined by Chengde Jianlong as a key R&D steel category.

For example, to address the issue of oxygen content affecting the fatigue life of gear steel, Chengde Jianlong developed a multi-process ultra-low oxygen control technology for gear steel, achieving stable control of total oxygen content at ≤10ppm. To improve the problem of sulfides reducing the transverse mechanical properties of steel, the company developed a sulfide modification treatment method, which spheroidizes, refines, and disperses sulfides in the steel to improve the cutting characteristics of gear steel, achieving dual improvement in processing and mechanical properties. To solve the technical bottleneck of deformation after heat treatment of carburized gear steel, the company developed a high homogenization control technology for gear steel, achieving precise and stable control of high-standard gear steel with a hardenability bandwidth of ≤4HRC and banded structure of ≤2.0 grade.

By adopting strict process controls such as full-process oxygen control, composition and structure homogenization treatment, sulfide morphology regulation, and large rolling ratio, Chengde Jianlong's gear steel products have high cleanliness, narrow hardenability bandwidth, excellent banded structure, and cutting performance, making them highly competitive in the market.

In the future, Chengde Jianlong will continue to lead with technological innovation, deeply cultivate the high-end automotive steel market, further improve product quality and technical level, and build a supply chain ecosystem of co-creation, sharing, and win-win, contributing to the high-quality development of the domestic automotive industry.

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