Who are we?
Jiangxi Duma Machinery Manufacturing Co., Ltd.
"DUMA Brand" —
Jiangxi Duma Machinery Manufacturing Co., Ltd. covers an area of 42000 square meters and has high-end production and testing equipment, a complete quality assurance system, and a high-quality management team. It is a comprehensive company that integrates research and development, production, and sales of wear-resistant parts for mining machinery
Offering a one-stop solution
Supports OEM and ODM customization services
The company was established
The company occupies a site
Our product
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 similar 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.
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Our strengths
Materials Metallurgy
Mn13-22 high-manganese steel undergoes water toughening treatment, achieving an HB hardness of 180-220 and an impact energy (Ak) ≥50 J/cm². The Cr26 high-chromium composite layer exhibits a metallurgical bond strength of ≥280 MPa, with a wear-resistant layer thickness ranging from 8 to 15 mm—both within controllable limits—and exceeds the ASTM A532 standard.
Casting Process
Steel melt is continuously purged with argon, combined with the HPM process (resin sand + chill casting), achieving O ≤ 20 ppm and H ≤ 2 ppm. Additionally, the shrinkage porosity in 10-ton sections is kept below 0.5%, meeting the EN 1559-2 Class 4 density standard.
Specialized equipment
8 melting furnaces (4 × 3-8 t medium-frequency + 4 × 10-20 t gas-fired), a 1600-ton hydraulic press, and 14 CNC vertical lathes. Dimensional tolerances can be consistently maintained at CT9 level (per GB/T 6414), with surface roughness Ra ≤ 25 µm.
Detection System
German SPECTRO MAXx spectroscopy, ZEISS metallography, and 4 MeV linear accelerator for non-destructive testing—plus furnace-side compositional feedback within ≤90 seconds. Certified under both ISO 9001 and IATF 16949 systems, with a first-time pass rate of ≥99.2%.
Production Capacity and Delivery
A 42,000 m² facility featuring 2 sand molding lines and an automated drying kiln, capable of producing 1,800 tons per month. Additionally, we offer over 500 standard components and advanced 3D laser scanning services to support rapid development of custom parts. STEP drawings are delivered within 24 hours, with standard orders completed in 15 days—and urgent requests can be fulfilled as quickly as 10 days.
Quality Service
We’ve built a database of over 300 worn-out mine components and established a customer-specific wear database, continuously optimizing and extending the service life of wear-resistant parts. Our dedicated technical team offers comprehensive pre-sales technical support, along with personalized after-sales solutions provided by a dedicated expert for each customer.
News and Information
2025-04-11
2026-05-13
Understanding Crusher Hammer Head Alloy Steel for the Mining Industry
2026-05-13
The Importance of High Manganese Cone Liners in Crushing Machinery
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.