Material and Process Advantages
• High-Wear-Resistant Alloy Formulation
Utilizing the ZGMn series of high-manganese steel (Mn13%-22%), this material achieves a hardness of HB180-220 after water-toughening treatment, with an impact toughness of ≥50 J/cm²—far surpassing the service life of conventional castings. Additionally, advanced composite casting technology enables metallurgical bonding between Cr26 high-chromium cast iron and the steel matrix, allowing for controllable wear-resistant layer thicknesses (8–15 mm) tailored to meet diverse operational requirements.
• Sand Mold Water Glass Casting
Argon blowing is applied to the molten steel to ensure its purity, resulting in products that are more durable and long-lasting. Wooden molds are used for production, enabling the one-time formation of complex cavity structures and significantly reducing subsequent machining costs. For large castings (up to 10 tons per piece), a combination of resin sand and chill techniques is employed, effectively addressing shrinkage defects in thick, large cross-sections.
Advantages of the Production System
• Major production equipment: 4 sets of 3-8-ton medium-frequency furnaces, 4 sets of 10-20-ton natural gas furnaces, 20 lifting devices, 1 large-scale shot blasting machine, 1 1600-ton hydraulic press, 2 sand casting production lines, 2 gantry milling machines, 2 CNC machine tools for mold processing, 14 CNC vertical lathes, and 2 face milling machines.
• Key inspection equipment: German SPECTRO spectrometer, metallographic microscope, mechanical property testing equipment, hardness testing devices, and non-destructive testing equipment.
• Production capacity: The company occupies a site of 42,000 square meters with modern, standardized factory buildings. Its annual production capacity reaches 20,000 tons, with individual product weights ranging from 2 kg to 10 tons.
Market Service Advantages
• Quality Assurance: Based on customers' actual operating environments and needs, we recommend and select the most suitable chemical formulations. We also establish a customer-specific wear database to continuously optimize and extend the service life of wear-resistant components.
• Customized Service Capabilities: We offer an extensive library of over 500 standard parts, including crusher liners, impact plates, and hammer heads, while providing rapid development support for non-standard components. On-site measurements are available, enabling us to produce detailed drawings within just one day.
• After-Sales Service Assurance: Our dedicated technical team delivers comprehensive pre-sale product guidance and provides personalized, one-on-one after-sales solutions tailored to meet your specific requirements.
Duma Machinery's main products include: mantle and concave liners, crushing walls, and distribution plates for cone crushers; jaw plates, side guards, and pressure bars for jaw crushers; lining plates for ball mills, autogenous mills, and other equipment; impact crusher hammers and impact plates; as well as hammer heads, screen bars, liner blocks, and other wear-resistant alloy steel components for metal shredders.