Material Selection for Helical Blades

Product name:	Material Selection for Helical Blades
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Industry:	Metallurgy and minerals - Metallurgy industry
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The material selection for helical blades is a critical determinant of their performance, lifespan, and cost. Faced with complex operating conditions such as severe wear, impact, and corrosion, there is no "one-size-fits-all" material. A comprehensive trade-off must be made based on specific application scenarios, material characteristics, working conditions, and cost budgets. The following is a detailed analysis of the main material categories and their selection logic:

Material Type	Representative Grades	Core Advantages	Main Disadvantages	Typical Application Scenarios
High-Strength Wear-Resistant Steel Plate	Hardox 400/450/500, NM360/400/450, JFE-EH400/500	Optimal comprehensive performance: High strength, good wear resistance, good toughness, weldability, relatively good machinability, and high cost-effectiveness.	Extreme wear resistance is not as good as high-chromium cast iron; toughness is not as good as high-manganese steel.	Widest range of applications: Crusher blades, conveying moderately abrasive materials (household waste, industrial waste, construction waste, wood, general mineral powder).
High-Chromium Cast Iron	Cr15, Cr20, Cr26, KmTBCr26	Top-notch wear resistance: Extremely high hardness (HRC 55-65), extremely strong resistance to abrasive wear.	Extremely poor toughness: High brittleness, easy to break; Poor weldability: Difficult to weld and repair; Difficult to process: Usually cast, high cost.	Pure high-wear, low-impact conditions: Conveying slag, cinder, quartz sand, gravel, industrial solid waste containing a large amount of hard minerals. Use with caution where there is a risk of impact.
High-Manganese Steel	ZGMn13, ZGMn18Cr2	Excellent impact toughness: Surface hardens after impact, becoming harder with wear (HBW 500+).	General wear resistance without impact; high cost; work-hardened layer may peel off; welding requires special processes.	Strong impact conditions: Crushers processing materials containing large pieces of metal, stones, and other impurities (scrap cars, bulky waste); impact-resistant parts of mining and metallurgical equipment.
Stainless Steel	304, 316, Duplex Steel 2205, Wear-resistant steel such as AR400F	Good corrosion resistance: Suitable for humid, acidic, alkaline, or food-grade environments; some grades also have wear resistance.	Wear resistance is usually lower than dedicated wear-resistant steel; high cost; strength/hardness may not be as good as wear-resistant steel.	Food, pharmaceutical, and chemical corrosive environments: Food conveying, chemical raw material processing, wastewater treatment equipment blades.
Carbon Steel/Low-Alloy Steel + Surface Hardening	Q235B, Q345B + Overlay Welding/Spraying Wear-Resistant Layer	Economical and flexible: Low base material cost; wear-resistant layer can be customized as needed (hardness, thickness, location); can be repaired after wear.	Wear-resistant layer may peel off; complex process, quality depends on technology; overall performance is not as good as integral wear-resistant materials.	Areas with severe localized wear; limited budget but need to improve wear resistance; repairing old blades. Commonly used welding materials: Tungsten carbide composites, high-chromium cast iron welding materials.
Engineering Plastics/Composite Materials	Ultra-High Molecular Weight Polyethylene (UHMWPE), Nylon (PA), Reinforced Composite Materials	Light weight; corrosion resistance; self-lubricating (not easy to stick to materials); low operating noise.