Against the macro backdrop of ongoing and deepening global urbanization, underground infrastructure construction projects are showing a trend toward large-scale and intensive development. As the core and critical equipment for underground tunneling operations, the performance of tunnel boring machines directly determines the efficiency of construction projects, operational safety, and the level of cost control throughout their entire lifecycle. The cutterhead, as the core component responsible for rock-breaking and tunneling in tunnel boring machines, plays a crucial role... Wear resistance performance With Service life It has become the core bottleneck restricting the technological iteration and upgrading of tunnel boring machines (TBMs), and also represents a key focus for technological breakthroughs in the current field of underground engineering equipment. According to data from GEP Research’s 2026 industry report, the global market size for TBM cutter systems is steadily expanding. By 2025, the market had already surpassed US$1.9 billion, with an average annual compound growth rate remaining stable at around 5.8%. The market is projected to exceed US$2.5 billion by 2030. Among these, the Asia-Pacific region, driven by its dense infrastructure planning and construction demands, accounts for more than 55% of the global market share, making it the central region propelling the growth of the global TBM cutter market. Meanwhile, under complex geological conditions—such as hard rock and composite strata—the demand for hard-rock cutters, wear-resistant cutters, and composite cutters has risen to nearly 40%. This structural shift in market demand is directly spurring accelerated iteration and innovative upgrades in wear-resistant material technologies.

From the perspective of the global development landscape of tunnel boring machine cutter technology, leading international companies—relying on their long-term technological accumulation and continuous R&D investment—have established significant technological advantages and robust technological barriers in the field of wear-resistant materials. Industry leaders such as Sweden’s Sandvik and Germany’s ISCAR are focusing on the R&D and engineering application of high-end wear-resistant materials—including ultra-coarse-grained cemented carbides and metal-ceramic composites. By precisely controlling material composition ratios and optimizing preparation process parameters, combined with advanced surface enhancement technologies like laser cladding and hot isostatic pressing (HIP), they have significantly improved tool wear resistance, impact toughness, and fatigue resistance. The high-end reaming tools they’ve developed can be adapted to a wide range of rock formations spanning pressures from 20 to 300 MPa and can achieve highly efficient compatibility with mainstream tunnel-boring machine models worldwide. Meanwhile, leading international companies are taking the lead in implementing... Materials—Structure—Process The integrated R&D model deeply integrates intelligent technologies with the development of wear-resistant materials. By embedding sensing elements inside cutting tools, it enables real-time monitoring and early warning of tool wear conditions. Coupled with life prediction algorithms and a supporting software system, this approach establishes a comprehensive lifecycle management framework for cutting tools, driving the transformation of cutting-tool products from traditional, single-use consumables into smart components. Currently, the revenue share from related technical services has risen to around 30%. From the perspective of the global market competition landscape, the leading group in the tunnel boring machine cutter industry is dominated by a small number of multinational corporations, collectively accounting for approximately 45% of the market share. These companies also demonstrate highly active patent strategies; between 2024 and 2025, the annual growth rate of publicly disclosed invention patents related to tunnel boring machine cutters exceeded 15%. The core technology R&D efforts are focused on optimizing new composite material formulations, innovating manufacturing processes, and upgrading surface enhancement technologies.

Benchmarking against the world’s most advanced technological standards, China’s tunnel boring machine cutter industry—after years of intensive technological research and industrial accumulation—has achieved a leapfrog development, moving from technology follower and competitor to leader in certain fields, and has thus established a relatively complete industrial chain system and ecosystem. According to industry statistics released by the China Construction Machinery Industry Association, the Chinese market for tunnel boring machine (TBM) cutter tools reached RMB 9.8 billion in 2024, with an annual growth rate of approximately 12.3%. The market is expected to surpass RMB 11 billion in 2025 and could reach RMB 16 billion by 2030, maintaining a compound annual growth rate in the range of 8% to 10%. This growth momentum significantly outpaces the global average. Notably, the domestic production rate of TBM cutters in China has risen from 65% in 2020 to 78% in 2024 and is projected to exceed 90% by 2030. The cost advantages and technological advancements of domestically produced cutters continue to drive steady market expansion, gradually breaking the market monopoly held by international companies. Domestic enterprises are making continuous breakthroughs in the field of wear-resistant material innovation. Among them, Luoyang Jiujiu Technology Co., Ltd., a high-tech enterprise that has been deeply engaged in this industry for 30 years, has leveraged its solid R&D capabilities and extensive engineering manufacturing experience to align its innovations in wear-resistant materials and engineering applications with international standards. As a benchmark enterprise in China’s TBM cutter industry, Luoyang Jiujiu Technology Co., Ltd. provides crucial support for the ongoing localization of TBM cutter production in China.

At the material selection level Luoyang Jiujiu strictly benchmarks against international advanced standards and selects high-purity tungsten carbide and other premium raw materials. Based on theories of material composition design and performance optimization, the company has independently developed a series of products—including high-alloy steel cutter rings, ball-tooth cutter rings, and composite-material cutter rings—whose hardness ratings can reach HRC52-58 and HRA86-87.5. These cutter rings are suitable for various geological conditions ranging from 20 to 300 MPa, meeting the operational requirements of different construction scenarios. In hard rock formations with pressures between 100 and 300 MPa, the company’s cutter rings demonstrate outstanding wear resistance and impact resistance, with a service life that is 15% to 20% longer than the industry average. They are fully interchangeable with cutter tools used in tunnel boring machines manufactured by internationally renowned brands such as Herrenknecht, Pangwali, and Mitsubishi. The core performance indicators of these cutter rings have reached internationally advanced levels, breaking the technological monopoly held by foreign high-end cutter manufacturers. From the perspective of market application results, the company’s products not only cover extensively major domestic infrastructure construction projects but also see rapid growth in export volumes. In 2024, exports increased by 25% compared to 2023, with key export destinations including Europe and the U.S., Southeast Asia, and other regions, highlighting the international competitiveness of domestically produced cutter tools.

At the production process level Luoyang Jiujiu integrates advanced international manufacturing concepts and technical standards, employing imported TIMKEN bearings paired with high-quality seals and specialized lubricants. Through optimized assembly processes, it effectively enhances the tool’s load-bearing capacity and sealing reliability, thereby extending the product’s service life. At the same time, the company innovatively adopts advanced manufacturing techniques such as medium- and high-frequency brazing and laser cladding to build up a 3–5 mm wear-resistant layer on critical stress-bearing areas of the cutter body. By optimizing interfacial bonding strength, the tool’s wear resistance is further enhanced, keeping the failure rate below 3%, significantly lower than the industry average of 5%. This substantially improves the continuity and stability of construction operations. The tunnel boring machine cutters produced by the company cover the full range of products—including normal roller cutters, center roller cutters, and edge roller cutters—with specifications ranging from 8 to 20 inches. Based on users’ specific construction requirements and geological characteristics, the company can customize specialized cutters with varying load capacities (10–38 tons) and different sealing levels. With an annual production capacity reaching 30,000 sets, the company can fully meet the construction needs of underground projects under diverse geological conditions worldwide. Combining industry capacity data analysis, in 2024, China’s overall tunnel boring cutter industry had a capacity utilization rate of approximately 83%; meanwhile, Luoyang Jiujiu has consistently maintained a capacity utilization rate above 90%, clearly demonstrating its strong market competitiveness and product recognition, and reflecting the advantages of domestically produced cutters in practical market applications.

Currently, the global tunnel boring machine cutter industry is at a critical stage of technological iteration, and innovation in wear-resistant materials is showing three distinct development trends:
         First, diversified applications of high-end composite materials. New wear-resistant materials such as ultra-coarse-grained cemented carbides, nano-coatings, and metal-ceramic composites will gradually become the industry mainstream. By optimizing material composition and microstructure, the wear resistance, impact resistance, and fatigue resistance of cutting tools will be further enhanced. It is projected that by 2030, the market penetration rate of high-end cutting tools—such as diamond tools—will exceed 40%.
         Second, there is a deep integration of materials technology and intelligent technologies. The organic integration of intelligent sensing technology with wear-resistant materials will enable real-time monitoring of tool wear conditions and accurate prediction of service life, effectively reducing construction downtime by more than 30%. This provides strong technical support for improving construction efficiency and driving the advancement of shield tunneling machine operations toward greater intelligence and precision.
         Third, the concept of green circular development is being put into practice and implemented. Tool remanufacturing technology will gradually become more widespread. Through processes such as surface restoration and performance optimization, used tools can be transformed into valuable resources. According to industry forecasts, by 2030, the market share of high-performance tools that have undergone remanufacturing will reach over 20%, thereby achieving efficient resource utilization and promoting sustainable industrial development.