D155 D150 Super Heavy Duty Mining Track Chain Link Assembly with 35MnBH Steel 228.6mm Pitch and HRC 40-55 Hardness

The D155-D150-HD-TL Track Chain Link is a premium undercarriage component manufactured by YT (YinTai Parts), engineered for demanding excavator and bulldozer applications across construction, mining, and earthmoving projects. With over 35 years of manufacturing expertise based in Quanzhou, Fujian, China, our factory produces track chain links that meet stringent OEM specifications for major equipment brands worldwide.

Each track chain link is forged from 35MnBH high-grade alloy steel and undergoes a rigorous heat treatment process to achieve surface hardness levels of HRC 40-55 with a hardened depth of 4-10 mm. This advanced metallurgical treatment ensures exceptional wear resistance, extended service life, and reliable performance even in abrasive working conditions commonly encountered in mining, quarrying, heavy construction, and forestry operations.

• 228.6mm Extended Pitch Design: The large 228.6mm link pitch is specifically engineered for super heavy duty bulldozers, providing increased structural mass and load-bearing capacity to handle the extreme traction forces generated during mining overburden removal and heavy ripping applications on hard rock surfaces.
• Massive Forged Link Sections: Each link features substantially increased cross-sectional dimensions compared to standard bulldozer links, with reinforced rail sections and thickened pin boss areas that resist bending deformation under the sustained high-torque loads generated during mining dozing and push-loading operations.
• Deep Case Carburizing Treatment: Extended carburizing cycle combined with controlled diffusion achieves a deeper hardened case of up to 10mm depth while maintaining a tough ductile core, providing superior wear resistance for the long operating hours typical of mining production environments.
• Reinforced Pin and Bushing Interface: Oversized pin diameters with precision-ground surfaces and increased bushing wall thickness provide enhanced load distribution and wear life under the severe operating conditions encountered in open-pit mining, quarrying, and large-scale earthmoving projects.
• Specialized Mining-Grade Material Certification: Raw material for mining-grade track links undergoes additional spectrographic analysis and inclusion rating verification to ensure the 35MnBH steel meets the higher cleanliness and homogeneity standards required for components operating under extreme cyclic loading conditions.
• Full Assembly Load Testing: Complete track chain assemblies undergo tension proof-load testing at 125 percent of rated working load to verify structural integrity and pin retention before shipment, providing documented quality assurance for critical mining equipment applications.

At YT(YinTai Parts), our manufacturing process begins with the careful selection of 35MnBH steel raw material sourced from certified Chinese steel mills. The steel billets are heated to precise forging temperatures of 1100-1200 degrees Celsius in computer-controlled induction furnaces before being shaped under 2500-ton forging presses. Each link blank undergoes precision machining on CNC milling centers to achieve exact dimensional tolerances within ±0.1mm accuracy. The critical heat treatment stage involves austenitizing at 850-880 degrees Celsius followed by controlled oil quenching and tempering to achieve the specified HRC 40-55 surface hardness with 4-10mm hardened case depth. After heat treatment, every link passes through shot blasting for surface cleaning and stress relief. Final quality inspection includes magnetic particle testing for surface defects, ultrasonic testing for internal integrity, and coordinate measuring machine verification of all critical dimensions against OEM specifications.

YT (YinTai Parts) has been a trusted manufacturer of construction machinery undercarriage components since 1988, accumulating over 35 years of industry experience from our production base in Quanzhou, Fujian Province. Our 50,000-square-meter manufacturing facility is equipped with advanced forging lines, CNC machining centers, automated heat treatment furnaces, and comprehensive material testing laboratories. We hold ISO 9001:2008 quality management certification and CE certification for our exported products, ensuring compliance with international quality and safety standards. Our dedicated R&D team of 25 engineers continuously works on material improvements and design optimization to extend product service life. With an annual production capacity exceeding 120,000 track chain link assemblies, we serve distributors, equipment dealers, and end users in over 60 countries across Southeast Asia, the Middle East, Africa, South America, and Europe. Our in-house logistics team manages container loading, customs documentation, and international shipping coordination to ensure timely delivery worldwide.

This super heavy duty mining track chain assembly is engineered exclusively for Komatsu D155 and D150 series bulldozers deployed in open-pit mining, large-scale quarrying, coal mine overburden removal, and major infrastructure projects requiring continuous high-production earthmoving. The 228.6mm extended pitch design and massive forged link sections provide the structural robustness necessary for sustained operation in hard rock mining conditions where undercarriage components face extreme abrasion from sharp rock fragments and continuous impact loading. Mining contractors operating multiple D155 units in 24-hour production cycles depend on the reliable performance and extended service life of these premium track chain assemblies to minimize unplanned downtime and maintain production targets. The SALT lubrication system extends maintenance intervals in the dusty mining environment, while the full assembly format simplifies field replacement during planned maintenance shutdowns.

Q: What makes the 228.6mm pitch design necessary for mining bulldozers?

The larger 228.6mm pitch provides increased structural mass and load distribution area per link, which is essential for mining-class bulldozers that generate extreme traction forces during heavy ripping and dozing. Smaller pitch chains used on lighter machines would experience accelerated wear and potential structural failure under the same loading conditions due to insufficient material cross-section and reduced bearing area.

Q: How does the mining-grade material differ from standard 35MnBH steel?

Mining-grade 35MnBH steel undergoes additional refining processes to achieve higher metallurgical cleanliness with reduced inclusion content. This results in improved fatigue resistance and fracture toughness that are critical for components subjected to the high-cycle, high-stress loading conditions typical in continuous mining operations where unexpected downtime carries significant production cost implications.

Q: What is the expected service life in hard rock mining conditions?

In hard rock mining applications with abrasive quartzite or granite materials, these premium track chain assemblies typically provide 1,500 to 2,500 operating hours. Service life varies significantly based on rock hardness, operator technique, track tension maintenance, and underfoot conditions. Regular inspection and proper track tension adjustment can extend service life considerably.

Q: Can these chains be used on D275 series bulldozers as well?

Yes, our D155 D150 track chains share common design features with D275 series requirements. However, we recommend confirming the specific D275 model variant and serial number range as some D275 configurations may require different link specifications. Contact our engineering team with your machine details for exact compatibility verification.

Q: What shipping and logistics arrangements do you offer for mining equipment parts?

We ship mining-grade track chain assemblies in reinforced steel crates or heavy-duty wooden pallets with maritime-grade corrosion protection for ocean freight. We coordinate with major shipping lines serving mining regions in Australia, Africa, South America, and Southeast Asia. Express air freight options are available for urgent mining equipment maintenance requirements to minimize production downtime.

All track chain link assemblies are packaged in export-grade wooden pallets or steel crates with protective anti-rust coating applied to all machined surfaces before shipment. Each pallet is clearly labeled with product model, quantity, batch number, and manufacturing date for easy identification and inventory management. We offer comprehensive warranty coverage of 18-24 months from the date of shipment against manufacturing defects and premature wear under normal operating conditions. In the unlikely event of a warranty claim, our technical support team provides prompt response within 24 hours and arranges replacement parts shipment within 7 working days. Custom packaging options including branded packaging, retail-ready box packaging, and OEM neutral packaging are available upon request to meet specific distribution channel requirements.