In shield tunneling construction, scraper tools such as cutters and blades are typically fixed to the cutterhead using a bolted connection. From the perspectives of manufacturability and maintainability, the housing components—equipped with internal threads—are made from low-carbon alloy steel. These housings are then welded directly to the cutterhead’s baseplate, allowing for easy replacement if the housing becomes damaged. Considering both material costs and construction processes, low-carbon alloy steel remains the preferred material for manufacturing these cutterhead housing components today.

　　① It has excellent machinability, making it easy to shape into various forms at a low cost.

　　②Due to the low carbon and silicon content of the base material, severe hardened or quenched structures typically do not form during welding. Additionally, the higher manganese content helps prevent hot cracking. As a result, no special welding procedures are usually required, making this material highly weldable.

　　③ Raw materials are easy to procure, and production costs are low.

　　The company has successfully obtained certification under the GB/T19001-2000 standard for quality systems related to the design, development, production, and service of rock-cutting tools and wear-resistant liners. By integrating technology import with internal R&D and collaborative innovation, the company has continuously pushed the boundaries of innovation. Notably, it has actively participated in national key research projects such as the "Seventh Five-Year Plan" initiative on advanced wear-resistant materials and vertical shaft tunneling cutter technology, as well as the national science and technology programs focused on TBM and shield machines—and the prestigious "863" National High-Tech Research and Development Program. Additionally, the company has been entrusted with pivotal roles in both the SME Innovation Fund Project for shield machine cutters and the National Torch Program, leading to the development of a diverse range of specialized rock-cutting tools and wear-resistant components that now span multiple product categories and series.