Key Words：Centrifugal casting、cold milling roller、Composite rolls、High speed steel centrifugal rolls、High chromium centrifugal rolls、work rolls、Custom centrifugal casting rolls
I. Process Principle: Centrifugal Force Driven, Double-Layer Metallurgical Composite
Centrifugal casting rolls adopt horizontal high-speed centrifugal forming + double-layer metallurgical composite technology. The core principle is to utilize the powerful centrifugal force generated by high-speed rotation to achieve precise stratification and dense solidification of the molten metal.
1. Outer Layer Casting: High-alloy wear-resistant molten metal (high-chromium cast iron, high-speed steel, high-chromium steel, etc.) is injected into a high-speed rotating mold. Centrifugal force causes the molten metal to uniformly adhere to the inner wall of the mold, forming a dense, high-hardness, wear-resistant working layer free of shrinkage cavities and inclusions.
2. Core Casting: After the outer layer solidifies to the predetermined thickness, ductile iron or low-alloy steel molten steel is statically cast, forming an atomic-level metallurgical bond with the outer layer. This creates a strong and impact-resistant roll core and neck, completely solving the industry pain point of "inability to simultaneously achieve wear resistance and toughness" with a single material.
3. Subsequent Finishing: Through heat treatment, high-precision grinding, and non-destructive testing, a high-performance composite roll with a wear-resistant outer layer and a strong core is finally obtained.
II. Core Advantages: Four Major Breakthroughs, Performance Leap
1. Extremely Dense Structure, Near-Zero Defects:
Under centrifugal force, slag and gas in the molten metal are forcibly separated and discharged, resulting in castings free of porosity, sand holes, and slag inclusions. The density is more than 30% higher than traditional sand casting. The working layer of the roll body has a uniform distribution of carbides, fine grains, and a gentle hardness gradient. The hardness decay from the surface to the interior is controllable, avoiding the risk of excessively rapid local wear or peeling.
2. Double-layer metallurgical composite for precisely matched performance:
The outer layer uses high-chromium, high-speed steel, and other high-alloy materials, possessing excellent wear resistance, red hardness, and resistance to hot cracking, suitable for high-load rolling scenarios such as cold-rolled thin plates, steel plates, profiles, bars, and wire rods; the core uses ductile iron or low-alloy steel, with high tensile strength and good toughness, capable of withstanding the huge torque and impact loads during rolling, and not easily broken, achieving a perfect performance combination of "hard outside and tough inside."
3. Doubled service life and lower overall cost:
The unique dense structure and wear-resistant materials increase the steel throughput of centrifugal casting rolls by 50%-100% compared to traditional casting rolls, resulting in longer single rolling cycles, reduced roll change frequency and downtime, and significantly improved production line efficiency.
4. Flexible customization to suit diverse scenarios:
Rolls of different diameters and lengths can be customized according to customer needs, with materials including high-chromium cast iron, high-speed steel, semi-steel, and alloy steel, suitable for cold rolling work rolls, intermediate rolls, and support rolls. We also support customized surface roughness and weld overlay repair of old rolls to meet the diverse rolling processes and sheet quality requirements.
III. Choose Us, Choose Quality and Reliability.
With years of experience in roll manufacturing, we specialize in the research and development and production of centrifugally cast composite rolls. We possess a complete production line, a professional R&D team, and a comprehensive quality control system. Every roll strictly adheres to international standards such as ISO and can be customized according to national standards. We provide one-stop service from design and production to after-sales technical guidance, helping customers improve rolling efficiency, reduce production costs, and create value for the industry.
