Product Category

　　Product Highlights 
　　1. Made of high-chromium alloy with excellent wear resistance: Cr20/Cr26 high-chromium alloy featuring a high carbide content, effectively resisting erosion from fine-particle slurries. 
　　2. Thickened anti-corrosion coating for resistance to complex slurry corrosion: The vertical mill blade surface undergoes meticulous polishing followed by a thickened anti-corrosion coating, effectively guarding against the erosive effects of high-sulfur, high-chloride, and acidic/alkaline slurries. 
　　3. 100% inspection before shipment, with full traceability: materials and dimensions are inspected piece by piece; vertical mill blades are delivered only if they pass inspection. 
　　In fine and regrinding operations at mines, vertical mill liners are subjected to harsh conditions—high‑hardness slurry erosion, high‑sulfur and high‑chloride corrosion, and high‑frequency impacts—which lead to rapid wear and frequent replacement. This increases downtime and reduces throughput, directly hindering efforts to improve the grade of the final concentrate. Moreover, issues such as mismatched installation dimensions, long lead times, high minimum order quantities, and unclear after‑sales responsibilities from suppliers further exacerbate the dual burden on procurement and operations. 
　　Solution 
　　Our company’s BTMCr20/BTMCr26 high-chromium alloy blades are specifically engineered for the demanding operating conditions of mining applications. Addressing key wear challenges, the high‑chromium alloy boasts a high carbide content and exceptional hardness, significantly reducing downtime for replacement and ensuring stable, continuous operation of grinding processes while maintaining the required grade of the final concentrate. To tackle corrosion issues, the blade surfaces undergo meticulous polishing and are coated with an enhanced anti‑corrosion layer, effectively resisting the erosive effects of high‑sulfur, high‑chlorine slurries and extending service life. For compatibility concerns, our vertical mill blades are precisely matched to mainstream tower mills, eliminating the need for secondary machining. In response to lead‑time and minimum order quantity constraints, our spiral‑mixing blades can be custom‑fabricated from provided drawings within 45–60 days, offering flexible and rapid delivery. Finally, we address after‑sales needs with comprehensive support. 
　　I. Product Description 
　　Vertical mill blades (also known as vertical mill blades or spiral agitator blades) are critical wear‑prone components of vertical spiral tower mills. They are mounted at the lower end of the main shaft agitator assembly and, through rotation, drive the grinding media to perform fine grinding and regrinding operations on ore. Our company’s BTMCr20/BTMCr26 high‑chromium alloy vertical mill blades are specifically engineered for fine and regrinding applications in metal mines, making them suitable for gold, copper, lead–zinc, iron, manganese, nickel, and other metal mining operations. 
　　II. Product Specification Sheet

　　III. Product Features and Advantages 
　　• Full-process controllability from the furnace to heat treatment: medium-frequency induction furnace melting, direct-reading spectrometer analysis of all elements at the furnace outlet, and sample retention for traceability. A patented heat-treatment process ensures the microstructure and mechanical properties of vertical mill liners. 
　　• Grade alignment: Controlled according to GB/T 8263-2010 KmTBCr20 / KmTBCr26, with Mo/Ni/Cu adjusted as needed. 
　　• Hardness uniformity: The hardness variation within a batch of blades is ≤3 HRC, and the hardness gradient from the outer edge to the root of each individual blade is controllable, preventing early failure due to localized soft spots. 
　　• Dimensional conformity: The curved air guide surface, lug holes, and lock bolt holes are all fully rough- and finish-machined; hole spacing, chord height, and radius are inspected by coordinate measuring machine to ensure interchangeability within the same batch and on-site installation without rework. 
　　• Internal quality: Critical load-bearing areas undergo visual and non-destructive testing to detect cracks, porosity, slag inclusions, and shrinkage cavities; products failing inspection are not released from the factory. 
　　• Deformation Control: Large-radius blades are pre‑deflected in the opposite direction and annealed for straightening; arc height deviation is controlled within ±1.5 mm to prevent step mismatches during on-site ring assembly. 
　　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 high-chromium alloy castings for demanding applications such as fine grinding and regrinding in mining. Take vertical mill liners as an example: specifically optimized for high-hardness slurry erosion and high-sulfur, high-chloride corrosion, they are made from BTMCr20/BTMCr26 high-chromium alloys with high carbide content and a hardness of ≥56 HRC. The working surfaces undergo meticulous polishing and are reinforced with thick anti-corrosion coatings, effectively resisting fine-particle slurry erosion and acid–alkali attack. This significantly reduces downtime for replacement and lowers operating costs at the source. 
　　• We let the data speak, not empty talk of perfection: Casting processes are complex; we don’t promise “zero defects,” but we do promise “zero excuses.” Every batch of vertical mill blades undergoes comprehensive testing—precision measurement of arc curvature, hardness inspection for each piece, and more—to ensure a perfect fit with the installation site, preventing assembly looseness caused by curvature deviations. Complete test reports are provided, demonstrating our accountability through data and action. 
　　• Long-term partnerships—delivery is just the beginning: Our digital systems enable you to track production progress in real time, eliminating opaque, “black-box” operations; we respond immediately to quality concerns, with no delays; 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. 
　　V. Production and Quality Assurance 
　　• Premium Raw Materials: Carefully selected high-quality scrap steel and high-chromium alloy additives, free of rust and oil, ensure the purity of the vertical mill blade material at the source, laying the foundation for superior wear resistance. 
　　• Ultimate density: Ceramic sand combined with a large-diameter heating riser eliminates shrinkage porosity and cavities, resulting in a dense blade interior that resists cracking under continuous erosion by fine-particle slurry. 
　　• Precision melting: Melting is performed using a Fuji electric furnace from Japan, with real-time compositional verification via spectrometer to precisely control the content of key wear-resistant elements such as Cr and Mo, ensuring that blade hardness meets specifications (BTMCr20 ≥ 56 HRC, BTMCr26 ≥ 58 HRC). 
　　• Flawless casting: 850°C baking and bottom-pouring process eliminates sand holes, ensuring a smooth working surface and curved sections free of casting defects. 
　　• Strengthened metallography: Air-cooled normalizing treatment using a high-pressure blower yields a uniformly distributed M₇C₃ carbide microstructure, ensuring that the blades possess both high hardness and impact toughness, effectively resisting erosion by fine-particle slurries. 
　　• Powerful shot blasting: cleans sand from the surface while hardening it, enhancing the wear resistance of the blade’s working face. 
　　• Rigorous quality inspection: Hardness is tested for each individual piece to ensure the blade’s curvature is precise and fits the mounting area perfectly. 
　　• 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 is the minimum order quantity for vertical mill blades? 
　　Minimum order quantity is one piece. Bulk purchases qualify for discounted pricing. 
　　Q2: What is the delivery time? 
　　Custom-made vertical mill blades based on your drawings take 45–60 days. Expedited production can be arranged for urgent orders. 
　　Q3: What packaging options are supported? 
　　Fixed with steel brackets and protected by stretch film, or packaged in wooden crates, to meet the sea and land transportation requirements for vertical mill blades. 
　　Q4: Can the customer’s logo be printed on the packaging? 
　　Yes, but cast lettering is only supported on the non-working surface of the casting. 
　　Q5: What payment methods are supported? 
　　We accept T/T (telegraphic transfer) and L/C (letter of credit). For first-time collaborations, we recommend T/T; specific terms are negotiable, or we can discuss other phased payment arrangements.