Product Category

　　Product Highlights
　　• Work-hardening characteristics of high-manganese steel: Following intense impacts from steel balls and ore, the surface rapidly hardens to HB500 or higher; the material becomes progressively harder with continued abrasion, resulting in a wear life far exceeding that of ordinary carbon steels and low-alloy materials.
　　• Precision bar-shaped screen design: Regular, parallel bar-shaped screen openings allow qualified fine particles to discharge smoothly while effectively blocking large particles and grinding media, preventing blockage at the discharge outlet.
　　• Long service life reduces O&M costs: significantly decreases the frequency of wearing-part replacements, markedly saves maintenance expenses and downtime, and increases the mill’s overall throughput.
　　User Pain Points
　　The discharge grate plate (grate) is a critical component at the discharge end of a grate‑type ball mill, tasked with forcibly screening out qualified pulp and preventing over‑grinding. Traditional grate plates suffer from three major drawbacks: ① insufficient wear resistance in standard materials, leading to frequent replacements and substantial downtime losses; ② poorly designed screen openings that clog frequently, reducing discharge efficiency; and ③ inadequate structural strength, causing loosening and detachment under high‑speed vibration, thereby compromising operational safety.
　　Solution
　　Our company’s grid plates are cast from high-manganese steel, leveraging work-hardening properties to become progressively harder with wear. Precision strip-shaped screen openings allow fine material to discharge smoothly while effectively blocking oversized particles and grinding media. Under conditions of high rotational speed and intense vibration, the high-strength fixed mounting remains stable and does not shift.
　　I. Product Description
　　The discharge grate plate of a high-manganese steel ball mill is a critical core component inside the grate-type ball mill. Mounted at the discharge end of the mill shell, it performs forced screening to ensure qualified slurry and prevents over-grinding. Made from high-manganese steel, it offers excellent impact and fatigue resistance. Produced using ceramic sand casting, it features a dense structure, precise dimensions, and smooth inner walls of the screen openings, effectively reducing material flow resistance. It is widely used in ball mill equipment across industries such as mineral processing, cement and building materials, thermal power generation, and metallurgy and chemical engineering.
　　II. Product Specification Sheet

　　III. Product Features and Advantages
　　• Work hardening: the harder it is ground, the harder it becomes. After being subjected to intense impacts from steel balls, steel forgings, and large ore pieces, high-manganese steel rapidly hardens on its surface to a Brinell hardness (HB) exceeding 500, while its core retains a highly tough austenitic microstructure, providing both wear resistance and impact resistance, making it resistant to brittle fracture.
　　• Precision strip-shaped screen openings ensure high discharge efficiency: The surface features regular, parallel strip-shaped apertures that allow qualified fine particles to exit smoothly while effectively blocking larger particles and grinding media, preventing blockage at the discharge outlet. The smooth inner walls of the screen openings reduce flow resistance.
　　• High‑strength fixation, stable and non‑displacing: Equipped with robust mounting holes to reinforce local structural integrity, ensuring tight engagement with the cylinder end cover even under high‑speed rotation and severe vibration conditions, thereby eliminating the risk of loosening or detachment.
　　• Ceramic sand casting, precise dimensions: Utilizing advanced ceramic sand casting technology, the products feature a dense structure and accurate external dimensions, ensuring a high degree of installation fit.
　　IV. Why Choose Us
　　• Specializing in wear-resistant castings for harsh operating conditions: We are not a foundry chasing short-term deals; instead, we are rooted in China, focusing on the R&D and manufacturing of wear-resistant castings for demanding environments such as mining and power generation. Take grate bars (discharge grate plates) as an example: specifically optimized for forced discharge at the discharge end of ball mills under high‑impact wear conditions, they are made from high‑manganese steel using a ceramic sand casting process. This results in a dense microstructure, precise dimensions, and smooth inner walls of the rectangular screen openings that prevent material blockage. Under the impact of grinding balls and ore, the surface of the high‑manganese steel undergoes work hardening to a hardness exceeding HB500, while the core retains high toughness, resisting fracture under impact. Consequently, their service life far exceeds that of conventional materials, reducing downtime risks at the source.
　　• We let the test data speak for itself, rather than merely talking about perfection: Casting processes are complex; we do not promise “zero defects,” but we do promise “zero excuses.” Each batch of grate bars undergoes a full inspection process—including precise measurement of screen-hole dimensions, hardness testing, and magnetic particle inspection—to ensure that the rectangular screen-hole precision and installation dimensions are accurate, preventing hole blockage and material jamming. Complete test reports are provided, demonstrating our accountability through data and action.
　　• Long-term partnerships—delivery is just the beginning: Our digital systems let you track production progress in real time, eliminating opaque operations; we respond immediately to quality concerns without delay; and every shipment includes a detailed test report for your quality records. We believe that a supplier’s attitude toward resolving issues truly reflects its value.
　　V. Production and Quality Assurance
　　• Premium Raw Materials: Carefully selected high-quality scrap steel and punched billets, free of rust and oil, ensure the purity of the grate plate material at the source, laying the foundation for work-hardening in high-manganese steel.
　　• Ultimate density: Ceramic sand combined with a large-diameter heating riser eliminates shrinkage porosity and cavities, ensuring a dense microstructure within the grate plate that can withstand continuous impacts from steel balls and ore without developing internal defects.
　　• Precision melting: Melted in a Fuji electric furnace from Japan, with real-time compositional verification via spectrometer to precisely control carbon and manganese levels, ensuring work-hardening capability and impact toughness.
　　• Flawless Casting: Using a 850°C preheated ladle combined with bottom pouring, this process eliminates sand‑hole defects and ensures that the grate bars’ sieve openings and working surfaces are smooth and free of casting imperfections.
　　• Strengthened metallography: 30-second rapid quenching produces a uniform austenitic microstructure, achieving “hard exterior, tough interior” for the grate bars—surface hardness exceeds HB500 while the core retains high toughness.
　　• Powerful shot blasting: removes surface sand while hardening the material, enhancing the wear resistance of the grate plate’s working surface and the inner walls of the screen openings, thereby reducing material flow resistance.
　　• Rigorous quality inspection: Magnetic particle testing ensures precise dimensions of the grate bar apertures and mounting holes, preventing blockages and material jams.
　　• Transparent delivery: Scan a code to track progress in real time, with full visibility from material input to shipment.
　　VI. Frequently Asked Questions (FAQ)
　　Q1: What material is recommended for discharge grid plates?
　　We recommend ZG120Mn13Cr2 high-manganese steel, which hardens to a surface hardness exceeding HB500 upon impact and becomes progressively harder with continued wear.
　　Q2: What are the advantages of bar-type screen openings?
　　The parallel bar-shaped screen openings allow fine particles to pass through smoothly while effectively blocking larger particles and grinding media, preventing clogging and improving grinding efficiency.
　　Q3: How do you ensure a secure installation?
　　High-strength mounting holes ensure stable positioning under high-speed and high-vibration conditions, preventing loosening or detachment.
　　Q4: What is the minimum order quantity?
　　Negotiable; bulk purchases qualify for discounted pricing.
　　Q5: What is the delivery time?
　　Customization based on your drawings takes 45–60 days; expedited service is available upon negotiation for urgent orders.