Wood Chipper Knives

Shock Resistance Wood Chipper Knives

Structural Types

Disc Blades

• Mounted on a rotating cutter head

• Common types: 4-6 blades, 8-12 blades, spiral blades

• Good for large-diameter logs

• Makes high-quality, clean wood chips

• Mostly used in paper mills

Drum Blades

• Fixed on a cylindrical cutter drum

• Works well with different raw materials (bark, wood scraps, small-diameter wood)

• Suitable for small and medium processing plants

• Good for complex raw material needs

• Wood chips are slightly less even than disc blades

Lower Your TCO with Strategic Engineering

• We don’t just sell blades—we offer application engineering support

• Your TCO (Total Cost of Ownership) depends on how often you change and regrind blades

• We optimize the blade’s edge for your specific wood type

• This extends blade service time, making your mill more profitable

Superior Metallurgy for Hardwood & Frozen Logs

• Chipping hardwood or frozen logs needs a blade that won’t break under stress

• ALAS Wood Chipper Knives are made from Modified A8 Tool Steel

• This steel balances heat resistance and shock resistance well

• Prevents small chips (common in lower-quality blades)

• Keeps your operation running smoothly all year

Material Selection Guide

A8

• Type: High-toughness cold work die steel

• Best toughness and strong impact resistance

• Hardness: HRC 58–62

• Wear resistance: Medium

• High-temperature resistance: Good

• Corrosion resistance: Average

A8B (A8 Upgrade)

• Type: Optimized A8 steel

• Balances toughness and wear resistance; excellent high-temperature resistance

• Hardness: HRC 58–62 (more stable)

• Wear resistance: Better than A8

• High-temperature resistance: Excellent (won’t easily soften)

• Corrosion resistance: Good

D2

• Type: High-carbon, high-chromium cold work die steel

• Highest wear resistance and hardness; longest service life

• Hardness: HRC 60–62

• Wear resistance: Best (2–3 times that of A8)

• High-temperature resistance: Average (easily softens)

• Corrosion resistance: Good (semi-stainless, better than A8/A8B)

• Weakness: Poor toughness, easy to crack under high impact

How to Choose the Right Material

• Mixed raw materials, high impact (hardwood, knotty wood, wet wood) → Choose A8 (prioritize toughness)

• Continuous production, mainly hardwood (balance efficiency and service life) → Choose A8B (best cost-performance)

• Softwood/bamboo/straw, high capacity (want long service life, fewer blade changes) → Choose D8 (best wear resistance)

Material Composition (Key Differences)

Key Elements & Functions

• Carbon (C): Determines hardness and wear resistance (higher = harder but more brittle)

• Chromium (Cr): Improves durability and corrosion resistance

• Molybdenum (Mo): Makes the blade tougher and more heat-stable

• Vanadium (V): Improves wear resistance

• Tungsten (W): Improves heat resistance (not in D2)

Composition Highlights

• A8: Low carbon, medium chromium, high molybdenum/tungsten → Strongest toughness

• A8B: Slightly higher carbon, chromium, molybdenum/vanadium/tungsten than A8 → Toughness same as A8, better wear resistance

• D2: High carbon, ultra-high chromium → Strongest wear resistance, weakest toughness