The Science of Sharpness: Choosing the Right Metal Shear Blade for Your Shop
In metalworking, the quality of your shear blades directly affects the precision of your finished parts. Dull or low-quality blades cause:
To boost productivity and cut downtime, match your blade material to your processing needs.
1. Material Selection
Use the right steel grade for your sheet metal to get clean, consistent cuts. Below are the most common blade materials and their uses.
Blade Materials & Details
9CrSi Alloy Tool Steel
Key Traits: Hard, wear-resistant, balanced performance, low cost, most widely used
Hardness: HRC 58–60 (after heat treatment)
Uses: Thin cold-rolled sheet, galvanized steel, aluminum, copper, plastic, leather
6CrW2Si Alloy Tool Steel
Key Traits: Tungsten/silicon alloy, stays hard at high temps, harder/stronger than 9CrSi, less likely to chip
Hardness: HRC 60–62 (after heat treatment)
Uses: Hot shearing, light stainless steel, medium-strength steel
Cr12MoV / SKD11 Steel
Key Traits: Very wear-resistant, easy to harden, little distortion after heat treatment, long life
Hardness: HRC 58–60 (after heat treatment)
Uses: Low-carbon steel (all thicknesses), Q235, aluminum, copper, thin mild steel
H13 Hot Work Die Steel
Key Traits: Strong at high temps, tough, resists heat fatigue, no softening/deformation
Hardness: HRC 50–55 (after heat treatment)
Uses: Hot shearing (strip steel, thick plate), cold shearing (high-strength alloy, thick stainless steel)
D2 (American Standard)
Key Traits: High carbon/chromium, very wear-resistant, hard to deform, no chipping
Hardness: HRC 58–62 (after heat treatment)
Uses: Medium-low hardness plates (Q195/Q235/45# steel, 40Cr), aluminum, copper, brass, non-metallics (plastic, rubber, paper)
LD Cold Work Die Steel
Key Traits: High strength/toughness, fine grain (vanadium/molybdenum), very wear-resistant, no chipping
Hardness: HRC 58–62 (after heat treatment)
Uses: High-strength steel, thick plate, stainless steel, large hydraulic/CNC shears
Powder Metallurgy Steel (ASP23, ASP60)
Key Traits: Made via powder metallurgy, ultra-hard (HRC 62–65+), very wear-resistant, stable performance
Uses: High-precision shearing, heavy-duty/high-frequency operations (long life needed)
2. Precision Grinding & Straightness
Top-quality blades need to be flat, not just hard. Our blades meet these standards:
Flatness Control: Straightness error ≤ 0.02mm (even for multi-meter blades) via precision grinding
Optimal Clearance: Proper gap reduces heat, creates smooth cuts, no need for secondary polishing
3. How to Choose the Right Blade
General carbon steel (Q195, Q235): 9CrSi or Cr12MoV (low cost, reliable)
Medium-low hardness steel, aluminum/copper (45#, 40Cr, brass): SKD11 or D2 (wear-resistant, long life)
Light stainless steel, medium-strength steel: SKD11 or D2 (balances wear resistance and anti-chipping)
Thick stainless steel, high-strength alloys: H13 or LD (tough, no fracture)
Hot shearing (strip steel, thick plate): H13 or H13K (resists heat softening)
High-precision, heavy-duty shearing: Powder metallurgy (ASP23/ASP60) (longest life, best precision)
4. Extend Blade Life: Tips
Rotate Blades: Most blades have 2–4 cutting edges. Flip them regularly to double their use.
Adjust Clearance: Change the blade gap based on sheet thickness to avoid chipping.
Lubricate Blades: Proper lubrication reduces wear by 15% and keeps blades sharp.
Important Notes
Harder is not better: Balance hardness and toughness. Too hard = chipping; too soft = dulling.
Heat treatment matters: Even good materials need professional quenching/tempering to work well.
Sticky materials (stainless steel, aluminum, copper): Use Cr12MoV or SKD11 to prevent sticking/chipping.
High-quality shear blades keep your production line stable and efficient. We offer:
Replacement blades for top brands (Amada, LVD, Accurpress)
Custom solutions for all steel cutting needs
Industrial hydraulic shear knife customization
Our Core Products
Scrap steel shearing blades
Hot shearing blades
Shearing machine blades (we are professional manufacturers)
Industrial hydraulic shear knives customization
Hot shearing blades for steel rolling mills
Replacement blades for mobile hydraulic shears and excavators
ALAS Series Blades
Materials: 9CrSi, 6CrW2Si, Cr12MoV, H13, H13K, LD
Design: Rectangular cross-section
Hardness: HRC50–62
Performance: High-precision, burr-free cuts
Customization: Available per your drawings