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Guiyang Zhonghang Granted Screw Heat Treatment Patent

[Abstract]:Guiyang Baiyun Zhonghang Fastener Co., Ltd. has obtained a utility model patent (CN 223522593 U) for batch heat treatment equipment of large-diameter screws made of 40Cr steel.

According to official authorization announcement from CNIPA, Guiyang Baiyun Zhonghang Fastener Co., Ltd. has obtained a utility model patent titled Batch Heat Treatment Equipment for 40Cr Large-Diameter Screws, Publication No.: CN 223522593 U, filed in November 2024. The patented technology delivers an innovative solution for high-volume, high-efficiency heat treatment of large-size fasteners across the industry.

40Cr alloy steel features balanced tensile strength, hardness and toughness, making it the dominant raw material for large-diameter screws deployed in aerospace, construction machinery and rail transit equipment. Nevertheless, conventional heat treatment equipment has long plagued manufacturers with limited single-batch loading capacity, uneven heating and poor precision in temperature & holding-time regulation. Such drawbacks drag down productivity and trigger inconsistent mechanical performance, posing hidden risks to end equipment operational safety.

Targeting prevailing industrial pain points, the patented equipment mainly consists of three core assemblies: heating furnace, digital control cabinet and layered loading fixture. A dedicated feeding port is reserved on one side of the furnace to streamline bulk loading/unloading procedures and lay foundation for continuous mass production.

Mounted atop the furnace, the control cabinet serves as the equipment’s intelligent control center. With digital regulating system, operators can program customized heating curves and holding durations matching 40Cr metallurgical requirements, eliminating manual control errors on temperature and time to guarantee uniform heat treatment quality among production lots.

The dual-layer loading tray assembly stands out as the core innovative design. Differentiated from traditional single-layer carrier structure, upper and lower stacked trays nearly double the furnace loading capacity without extra floor footprint, drastically boosting batch throughput. Optimized gap between upper/lower plates facilitates smooth hot air circulation inside the furnace to ensure homogeneous heating of every single screw and stabilize finished mechanical properties.

As a specialized fastener R&D and production enterprise, Zhonghang’s new patent marks solid technical prowess transformation into tangible production benefits. Per company management, post-implementation of this device lifts batch heat treatment efficiency of 40Cr large screws by over 30% and raises finished product qualification rate by 5%~8%, cutting comprehensive manufacturing cost notably.

From industrial perspective, popularization of this proprietary technology will accelerate domestic upgrading of large fastener heat-treatment facilities and reduce reliance on imported high-end thermal processing equipment. Premium 40Cr screws treated by the new setup will underpin performance improvement of homemade high-end equipment covering aerospace and heavy engineering machinery.

Going forward, Guiyang Baiyun Zhonghang plans to further iterate on this patented design to expand applicability for fasteners of diverse materials and specifications, fueling continuous technological advancement within China’s fastener sector.

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Guiyang Zhonghang Granted Screw Heat Treatment Patent

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