Duma Casting, a leading Chinese manufacturer of wear parts for crushing and grinding equipment, is set to dispatch 42 tonnes of grinding rings and grinding rollers to an African client, further reinforcing the company's expanding presence across the global mining and mineral processing sector.
CHINA - November 2026 - Duma Casting, a direct-ownership manufacturer headquartered in China, has announced that a 42-tonne consignment of grinding rings and grinding rollers is being prepared for shipment to a customer in Africa. The upcoming delivery marks another significant step in the company's efforts to serve the high-demand mining markets of the African continent, where reliable, high-performance wear parts are critical to sustained operations.
The grinding rings and grinding rollers, produced at Duma's own 42,000-square-metre integrated manufacturing campus, are precision-engineered components used in vertical roller mills and other industrial grinding equipment widely deployed in cement, mining, and mineral processing applications across Africa.
Goods Ready for Dispatch
Meeting Africa's Growing Industrial Demand
Africa's mining and cement industries have seen robust growth in recent years, driving demand for durable, cost-effective wear solutions. Grinding rings and grinding rollers are among the most intensively consumed wear parts in mill operations, and sourcing them reliably - with consistent quality and acceptable lead times - remains a persistent challenge for plant operators across the continent.
Duma Casting's readiness to supply 42 tonnes in a single shipment reflects the company's substantial production capacity. Operating its own in-house foundry alongside dedicated heat treatment and precision machining workshops, Duma maintains a monthly output of up to 1,000 tonnes of cast wear parts, with annual capacity reaching 10,000 tonnes. This integrated production model eliminates dependence on third-party subcontractors, ensuring stable delivery schedules and full technical traceability for every batch.
"We are not a trading company," a company spokesperson noted. "Every component we ship - from the initial melt to final dimensional inspection - is produced and verified within our own facility. That is what allows us to guarantee the consistency that large-scale mining clients require."
Material Excellence and Quality Assurance
The grinding rings and grinding rollers in this upcoming shipment are manufactured from high-manganese steel alloys (Mn13, Mn18, and Mn22 grades), processed through Duma's computer-controlled, automated heat treatment furnaces using a proprietary stepped-temperature water toughening (quenching) process. This treatment dissolves brittle carbides and stabilises a pure austenitic microstructure - a critical factor in achieving the balance of hardness and toughness essential for high-wear grinding applications.
Each production batch undergoes a rigorous quality control programme, including:
- Hardness testing - base hardness is verified to fall within the optimal range (typically around HB200 at delivery), with the material's work-hardening capability enabling surface hardness to reach HB500 and above under operational impact loads.
- Metallographic analysis - high-magnification microscopic inspection ensures the absence of network carbide precipitation, in accordance with ASTM A128 or GB/T 13932 standards.
- Dimensional inspection - strict geometric verification guarantees fit accuracy with the customer's mill frame and housing components.
- Non-destructive testing - ultrasonic (UT) and magnetic particle (MT) testing, as well as penetrant (PT) inspection, are performed to detect any subsurface defects prior to shipment.
A full set of technical documentation accompanies every batch, including material certificates, heat treatment curves, dimensional reports, and metallographic reports - all fully traceable to the specific production run.
Customization Available for African Clients
Beyond standard supply, Duma Casting offers comprehensive OEM and ODM customisation services tailored to individual mill models and ore processing conditions. Clients who require non-standard dimensions, upgraded alloy compositions, or components matched to specific equipment brands are encouraged to contact Duma's engineering team directly.
Duma's engineering capabilities include design based on customer-supplied drawings, reverse engineering from worn samples, and alloy customisation for specific abrasion profiles - for instance, specifying Mn22 grades or titanium carbide (TiC) inserts for particularly aggressive ore types. With a pattern library of over 4,000 moulds covering major OEM brands - including Metso, Sandvik, Terex, Powerscreen, Kleemann, and others - most configurations can be put into production without the additional cost or lead time of new tooling development.
Standard items are available for delivery within 7–10 days from existing stock, while custom-cast orders typically carry a lead time of 35–45 days. Duma supports FOB, CIF, and EXW shipping terms, and provides complete export documentation for customs clearance in the destination country.
Contact Duma Casting
African mining operators, cement producers, and equipment distributors seeking a reliable, factory-direct source of grinding rings, grinding rollers, and other wear parts - including crusher liners, jaw plates, cone mantle and bowl liner assemblies - are welcome to reach out to Duma Casting for technical consultation, sample orders, or bulk supply quotations.
Duma Casting holds ISO 9001:2015 quality management system certification and offers a 12-month quality warranty against casting defects, backed by a 24/7 technical support team.
For inquiries, customisation requests, or pricing information, please contact Duma Casting's international sales team.
