Phone:
86-15852949220
NANJING ALAS INTERNATIONAL CO., LTD
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Structure: Attached to a rotating cutter head (4–6, 8–12 blades, or spiral design)
Features: Clean cuts, high-quality chips, good for large logs
Main Use: Paper mills (need high-quality chips)
Structure: Fixed to the surface of a cylindrical cutter drum
Features: Works well with many raw materials (bark, small logs); chips are slightly less even than disc blades
Main Use: Small/medium plants with varied raw materials
Toughness/Impact Resistance: A8 (Best), A8B (Almost as good as A8), D2 (Worst)
Wear Resistance: A8 (Good), A8B (Better than A8), D2 (2–3x better than A8)
Hardness (HRC): A8 (58–62), A8B (58–62, more stable), D2 (60–62)
High-Temp Resistance: A8 (Good), A8B (Excellent, no annealing), D2 (Average, softens easily)
Corrosion Resistance: A8 (Average), A8B (Good), D2 (Semi-stainless, best)
Carbon (C): A8 (0.50–0.60%), A8B (0.55–0.65%), D2 (1.40–1.60%) – Controls hardness/wear resistance (higher = harder/breakable)
Chromium (Cr): A8 (4.75–5.50%), A8B (5.20–6.00%), D2 (11.0–13.0%) – Makes hardening easier; resists corrosion
Molybdenum (Mo): A8 (1.15–1.65%), A8B (1.40–1.80%), D2 (0.70–1.20%) – Strengthens toughness; works well at high temps
Vanadium (V): A8 (0.80–1.40%), A8B (1.00–1.50%), D2 (0.50–1.10%) – Boosts wear resistance
Tungsten (W): A8 (1.00–1.50%), A8B (1.20–1.70%), D2 (None) – Works well at high temps; resists wear
Design: Low carbon + medium chromium + high Mo/W = strong impact resistance
Key Benefit: Won’t chip or break when cutting hardwood, knotty wood, or wet wood
Best For: Small/medium chippers; mixed raw materials with high impact
Design: Improved A8 with better metal mix and heat treatment
Key Benefit: Toughness nearly equal to A8; better wear resistance; no annealing during non-stop work (best value)
Best For: Medium/large non-stop production (papermaking/wood panels); rubberwood/eucalyptus
Design: High carbon + 12% chromium (semi-stainless) = unmatched wear resistance
Key Benefit: Lasts 2–3x longer than A8; fewer replacements
Limit: Poor toughness (may crack under high impact)
Best For: High-capacity chippers; softwood/bamboo/straw (low impact, high wear)
Blades are ground to exact sizes (uniform weight and dimensions per set)
Stops vibration that damages bearings/drums
Benefits: Smoother operation, less fuel use, less engine stress
Unlike standard heating/cooling, vacuum heat treatment gives uniform hardness (HRC 55-58) from surface to core
Eliminates internal stress → blades resist chipping/breaking under heavy loads
Work Scenario: Mixed raw materials (hardwood/knotty/wet wood) – Best Material: A8 – Reason: Max toughness prevents breakage
Work Scenario: Non-stop production (hardwood focus) – Best Material: A8B – Reason: Balanced toughness/wear resistance (best value)
Work Scenario: High-volume softwood/bamboo/straw processing – Best Material: D2 – Reason: Long service life; fewer replacements
Our blades work with major brands (Morbark, Bandit, Vermeer) – a reliable replacement for original parts
We offer custom sizes to match your chipper model and needs
Material Logic: A8 = toughness for high-impact wood; A8B = balanced (best value); D2 = extreme wear resistance (low-impact/high-volume)
Manufacturing: CNC grinding and vacuum heat treatment unlock metal performance, preventing damage and stress
Selection Tip: Match material to raw materials and work load – prioritize toughness for impact, wear resistance for volume, balance for non-stop hardwood work
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.