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NANJING ALAS INTERNATIONAL CO., LTD
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Lower fuel costs
Less machine downtime
Safer operation
Disc Blades: Mounted on a rotating head (4-6, 8-12 blades, or spiral design). Good for large logs, makes clean, high-quality chips. Best for paper mills.
Drum Blades: Fixed to a cylindrical drum. Works well with bark, small wood, and mixed materials. Great for small-to-medium plants, but chips are slightly less uniform than disc blades.
Type: High-toughness cold work die steel
Strengths: Very tough, resists impact, won’t break easily
Best for: Small-to-medium chippers, mixed wood, hardwood, knotty or wet wood
Other: Good high-temperature resistance, average corrosion resistance
Type: Improved A8 steel
Strengths: Tough like A8, but more wear-resistant; stays sharp longer, resists high heat
Best for: Medium-to-large production lines (paper, wood panels), hardwood (rubber wood, eucalyptus)
Other: Good corrosion resistance, great overall performance
Type: High-carbon, high-chromium "semi-stainless" steel
Strengths: Extremely wear-resistant, hard, long-lasting (2–3x more than A8)
Best for: Large, high-capacity chippers, softwood, bamboo, straw (low impact, high wear)
Other: Better corrosion resistance; less tough, may crack under high impact
Mixed, high-impact materials (hardwood, knotty wood, wet wood) → Choose A8 (prioritize toughness)
Continuous production, mainly hardwood → Choose A8B (best overall performance)
Softwood/bamboo/straw, high capacity → Choose D2 (longest life, most wear-resistant)
Balanced blades: Prevents vibration that damages bearings and uses more fuel
CNC-ground edges: Ensures consistent chip quality (critical for paper/pulp)
Replacement blades: Fits major brands (Vermeer, Bandit, Morbark, Echo)
Custom options: We make blades to your blueprints or samples
The core difference between the three chipper blade materials A8, A8B, and D2 lies in the different ratios of alloy elements such as carbon (C), chromium (Cr), molybdenum (Mo), and vanadium (V), which directly determine toughness, wear resistance, hardness, and cost. The following is a comparison of their standard chemical compositions (mass percentage, wt%) and key functions.
Element | A8 | A8B (A8 Modified) | D2 | Key Functions |
Carbon (C) | 0.50–0.60% | 0.55–0.65% | 1.40–1.60% | Determines basic hardness and wear resistance; the higher the content, the harder and more brittle |
Chromium (Cr) | 4.75–5.50% | 5.20–6.00% | 11.0–13.0% | Improves hardenability and corrosion resistance; forms hard carbides (e.g., Cr₇C₃) |
Molybdenum (Mo) | 1.15–1.65% | 1.40–1.80% | 0.70–1.20% | Refines grains, improves toughness and high-temperature stability; inhibits temper brittleness |
Vanadium (V) | 0.80–1.40% | 1.00–1.50% | 0.50–1.10% | Forms extremely hard VC carbides, significantly improves wear resistance; prevents grain growth |
Tungsten (W) | 1.00–1.50% | 1.20–1.70% | — | Improves hot hardness and high-temperature wear resistance |
Manganese (Mn) | 0.20–0.50% | 0.30–0.60% | 0.10–0.60% | Deoxidation, improves hardenability |
Silicon (Si) | 0.20–0.80% | 0.50–1.00% | 0.10–0.60% | Deoxidation, improves strength and oxidation resistance |
Phosphorus (P) | ≤0.030% | ≤0.025% | ≤0.030% | Harmful impurity, reduces toughness |
Sulfur (S) | ≤0.030% | ≤0.025% | ≤0.030% | Harmful impurity, reduces toughness |
Low C, medium Cr, high Mo/W: Carbon content is only 0.5–0.6%, ensuring matrix toughness; chromium is about 5% to provide basic wear resistance; molybdenum and tungsten work together to strengthen, achieving impact resistance and not easy to break.
Positioning: Priority to impact resistance, suitable for high-impact working conditions such as hardwood, knotty wood, and wet wood.
Fine-tuned on the basis of A8: C, Cr, Mo, V, and W are all slightly increased, greatly improving wear resistance and high-temperature stability while retaining the high toughness of A8.
Positioning: Optimal comprehensive performance and highest cost performance, suitable for medium and large-scale chippers with continuous production.
High C, ultra-high Cr, appropriate Mo/V: Carbon content is as high as 1.4–1.6%, forming a large number of hard carbides; chromium is about 12%, known as "semi-stainless steel", with top-level wear resistance and corrosion resistance.
Cost: The worst toughness and highest brittleness, easy to crack under high impact; high price and high processing difficulty.
Positioning: Priority to wear resistance and longest service life, suitable for raw materials with high wear and low impact such as softwood, bamboo, and straw.
Nanjing Alas International Co., Ltd. is a professional industrial tooling manufacturer focused on shear blades, bending dies, shredder blades, and custom wear parts. We offer full application engineering, material selection, setup guidance, and after-sales support to global customers.
Tell us your requirements, and our engineering team will provide professional solutions for blade specification, tool life optimization, and cost-effective production.