Product Category

　　 Product Highlights
　　1. Virtually no plastic deformation during service: Unlike wear-resistant castings, which exhibit significant plastic deformation, chromium-molybdenum alloy steel shows almost no deformation in service and is unlikely to experience bolt breakage or detachment.
　　2. High initial hardness and good impact toughness: The chromium-molybdenum alloy steel liner has a relatively high initial hardness (HRC 33–43) and an impact toughness value AK ≥ 60 J, balancing wear resistance with impact resistance.
　　3. Reduced downtime for maintenance: The frequency of shutdowns for maintenance during mill operation is decreased, reducing workers’ physical workload and ensuring high equipment availability, thereby lowering operating costs for the user organization.
　 　User Pain Points
　　Large autogenous and semi-autogenous mills exceeding 5 meters in diameter are subjected to sustained high‑stress impacts from grinding media and ore. Traditional wear‑resistant castings used in these applications suffer from three major drawbacks during service: (1) High‑manganese steels exhibit relatively low yield strength, making them prone to plastic deformation under the impact and grinding action of steel balls and ore; (2) Plastic flow of the liner leads to thinning and enlargement of its peripheral dimensions, resulting in the filling of inter‑liner gaps; and (3) Liner deformation imposes substantial shear stresses on the mounting bolts, causing frequent bolt breakage and loss; in severe cases, this can lead to liner detachment or even distortion of the mill shell.
　　 Solution
　　Our company’s chromium-molybdenum alloy steel liners exhibit high initial hardness and minimal plastic deformation. This alloy steel offers excellent wear resistance and is widely used for autogenous and semi-autogenous mill liners. It boasts outstanding hardness uniformity, ensuring dimensional stability throughout the service life and eliminating the risk of bolt failure.
　 　I. Product Description
　　The chromium-molybdenum alloy steel liners produced by our company exhibit high initial hardness, minimal plastic deformation, and excellent impact toughness. During mill operation, they reduce the frequency of shutdowns for maintenance, decrease workers’ physical exertion, ensure high equipment availability, and help users lower operating costs.
　　 II. Product Features and Advantages
　　• Dimensional stability, preventing bolt failure: Chromium-molybdenum alloy steel liners exhibit virtually no plastic deformation during service, maintaining stable dimensions. This ensures that the fixing bolts are not subjected to additional shear forces, thereby resolving the common issue of bolt breakage and detachment in wear-resistant castings.
　　• High and uniform hardness: Initial hardness HRC 33–43, with a hardness difference of no more than HRC 2 from the surface to the core, ensuring the liner exhibits consistent wear resistance across its entire thickness.
　　• Excellent impact toughness: With an impact toughness value of AK ≥ 60 J, it does not become brittle under the impact of large materials and grinding media, offering both wear resistance and impact resistance.
　　• Reduce maintenance rates and increase operational uptime: The liner remains deformation-free, crack-free, and intact throughout its service life, significantly reducing unscheduled shutdowns for maintenance, easing workers’ physical workload, and ensuring long-term continuous equipment operation.
　　• Reduced overall operating costs: Extended liner replacement intervals reduce downtime losses and labor costs, resulting in significantly lower total cost of ownership compared to wear-resistant castings.
　　 III. Why Choose Us
　　• Specializing in wear-resistant castings for harsh operating conditions: We are not a foundry chasing short-term deals; instead, we focus on developing wear-resistant castings for demanding environments such as mining and power generation. Take chromium-molybdenum alloy steel liners as an example: specifically optimized for the high-impact, high-wear conditions of large autogenous and semi-autogenous mills, they exhibit minimal plastic deformation, prevent bolt breakage, and reduce 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.” Every batch of chromium-molybdenum alloy steel liners undergoes a full inspection process, including nondestructive testing, and is accompanied by a complete test report. We do not shy away from problems; instead, we demonstrate accountability through data and action.
　　• Long-term partnerships—delivery is just the beginning: We reject one-off transactions. Our digital systems enable you to track production progress in real time, eliminating opaque, “black-box” operations; we respond promptly to quality concerns, never delaying; and each shipment comes with a comprehensive test report for your quality‑assurance records. We believe that a supplier’s approach to resolving issues is what truly defines its value.
　　 IV. Production and Quality Assurance
　　• Premium raw materials: Carefully selected high-quality scrap steel free of rust and oil, ensuring the purity of the chromium‑molybdenum alloy steel liner material at the source.
　　• Ultimate density: Ceramic sand combined with a large-diameter heating riser eliminates shrinkage porosity and cavities, resulting in a dense, uniform microstructure within the lining.
　　• Precision melting: Melted in a Fuji electric furnace from Japan, with real-time compositional verification via spectrometer to precisely control key elements such as Cr and Mo.
　　• Seamless casting: 850°C package baking plus bottom-pouring process; the working surface of the lining plate is smooth and free of sand holes, effectively preventing stress concentration and cracking.
　　• Strengthened metallography: 30-second rapid quenching ensures uniform hardness throughout the liner (hardness difference ≤ HRC2), providing both wear resistance and impact toughness.
　　• Powerful shot blasting: cleans and hardens the surface, enhancing the wear resistance of the liner.
　　• Rigorous quality inspection: Magnetic particle testing ensures precise liner dimensions and zero internal defects.
　　• Transparent delivery: Scan a code to track progress in real time, with full visibility from material input to shipment.
　　 V. Frequently Asked Questions (FAQ)
　　Q1: Which mills are chromium-molybdenum alloy steel liners suitable for?
　　Suitable for large autogenous mills and semi-autogenous mills with a diameter of 5 meters or more.
　　Q2: What are the advantages of chromium-molybdenum alloy steel liners?
　　During service, the chromium-molybdenum alloy steel liners exhibit virtually no deformation, the bolts do not fracture, and the maintenance rate is significantly reduced.
　　Q3: What payment methods are available?
　　We accept T/T (telegraphic transfer) and L/C (letter of credit); specific terms are negotiable.
　　Q4: What is the delivery time?
　　Customization based on your drawings takes 45–60 days; expedited service is available upon negotiation for urgent orders.