What Are Sheet Metal Shear Blades?
Sheet metal shear blades are paired upper and lower cutting parts fitted on industrial plate shears including guillotine and swing-beam shears. metal sheets, bars, and plates pass through the gap between the two blades and are cut to required sizes via powerful mechanical force. The blade quality directly affects cutting finish, sheet flatness and maintenance frequency.
Why Blade Quality Matters Greatly
Low-quality blades have prominent drawbacks: burrs generate after limited shearing runs, they cannot clamp thick sheets stably, and a tiny edge chipping requires full blade disassembly and replacement.
Qualified premium blades bring these advantages:
Clean burr-free cuts without secondary polishing
Stable sharpness for full-day continuous working
Lower pressure load on the machine hydraulic system
In short, equipping with high-quality blades greatly cuts down daily blade grinding work.
Common Shear Blade Material Selection Guide
| Material | Hardness (HRC) | Application Scope |
| D2 | 58–62 | Stainless steel, high-strength steel plates, heavy abrasion working scenarios |
| H13 | 50–55 | Hot shearing processing, thick metal plates, high-impact shearing jobs |
| 9CrSi | 58–60 | Cold rolled steel, galvanized steel, aluminum sheets, copper sheets |
| Cr12MoV (SKD11) | 58–60 | Q235 ordinary mild carbon steel, aluminum plates |
| LD | 58–62 | High-strength steel, thick stainless steel, large CNC plate shears |
| Powder Metallurgy Steel (ASP23/ASP60) | 60–65 | High-precision cutting, extra service life, wear-resistant steel plate processing |
Core Selection Principle: Higher hardness does not mean better performance. Excessively hard blades chip easily when cutting hard spots or thick plates; overly soft blades turn blunt quickly. Always match blade material and hardness to your actual plate material and thickness.
Blade Material Matching for Different Metal Plates
Ordinary mild carbon steel (Q195, Q235): 9CrSi / Cr12MoV, cost-effective option
Thin stainless steel: D2 / SKD11
Thick stainless steel & high-strength alloy steel: H13 / LD
Aluminum, copper, brass plate: D2, excellent anti-sticking performance
Hot shearing under high temperature: H13, H13K
Ultra-high cutting precision & long service life demand: Powder metallurgy steel
Special Note: Stainless steel, titanium alloy and aluminum are adhesive metal materials. D2 steel blades feature outstanding anti-adhesion and anti-chipping performance compared with regular blades, delivering smoother cutting surfaces.
Production Standard of Premium Shear Blades
Huge price difference of shear blades in the market depends on three core manufacturing standards:
Qualified Raw Material: Complete official Material Test Report (MTR) provided. Inferior blades adopt falsely marked steel materials.
Professional Vacuum Heat Treatment: Integral uniform hardness with few soft points. Cheap blades only get surface hardening with soft inner structure.
High-precision Grinding: Blade parallelism controlled within ±0.01mm, ensuring straight cutting and burr-free finished sheets.
On-site Practical FAQs
Q1: What is the best industrial shear blade?
A: There is no one-size-fits-all best blade. Only the blade matching your working condition works best. The selection depends on shearing material, plate thickness and daily shearing volume.
Q2: What are the differences between D2, H13 and 9CrSi? How to choose?
A: Check the quick reference below:
| Blade Material | Applicable Working Scenarios |
| D2 | Cold shearing stainless steel, high-strength steel, mild carbon steel; great wear resistance, universal grade |
| H13 | Hot shearing, thick plates, high-impact cutting; high temperature resistance and excellent toughness |
| 9CrSi | Aluminum, copper, thin mild steel; low cost, sharp edge, easy regrinding |
| Powder Metallurgy (PM) Steel | High-precision, high-output production lines, ultra-long service life required; top performance with higher cost |
Q3: Exact blade selection for specific metal materials?
A: Follow this clear selection list:
Mild carbon steel (Q235 etc.): 9CrSi or D2
Stainless steel & high-strength steel: D2
Thick plate & hot high-temperature shearing: H13
High-volume non-stop production, ultra-long service life required: Powder Metallurgy (PM) Steel
Q4: Are shear blades better with higher hardness?
A: Definitely no. Excessively hard blades suffer edge chipping; overly soft blades get dull rapidly. The balanced hardness and toughness matters most, pick blades fit for your processing material.
Q5: Why heat treatment matters more than steel grade?
A: For blades marked with the same D2 grade, blades processed by ordinary heat treatment have half the service life of vacuum heat-treated blades. Vacuum heat treatment delivers uniform integral hardness, zero soft spots and anti-chipping performance. Verify supplier’s professional heat treatment capability instead of only checking steel material name.
Q6: Why not choose blades only based on unit price?
A: The blade procurement cost is low, but downtime cost, replacement cost and frequent regrinding cost bring huge hidden loss. High-quality blades serve half a year per use, while cheap low-end blades need replacement 3 times a month. Calculate the comprehensive cost per shear cut instead of unit price.
Q7: Recommend one universal blade for regular use?
A: D2 blade (HRC 58-62) is the safest universal option for most common working conditions, including cold-cut mild carbon steel, thin stainless steel, aluminum sheets and more. It features great wear resistance, wide compatibility and favorable cost performance. Choose H13 or PM steel only for hot shearing or ultra-high output working needs.
Q8: How often to grind shear blades?
A: The cycle depends on daily processing volume. Grind blades once obvious cutting burrs, dull machine running sound or whitened cutting edges appear. For regular mild carbon steel processing, regrinding is needed every 6 to 12 months under normal working conditions.
Q9: Can one set of blades cut both stainless steel and aluminum?
A: Yes, adjustable blade clearance is required. For plates with the same thickness, set smaller clearance for stainless steel. D2 blades own strong material compatibility for mixed cutting work.
Q10: How to adjust blade clearance correctly?
A: Set blade clearance at 5%–10% of plate thickness. Example: 2mm metal plate matches 0.10–0.20mm clearance. Adopt smaller clearance for hard metal, larger clearance for soft metal.
Q11: Custom non-standard shear blades available?
A: Yes. Custom blades can be manufactured per customer drawings, including customized length, mounting hole position and cutting edge shape. ALAS supports full non-standard blade customization.
Purchase Suggestion
Shear blade is a key wearable part for plate shearing machines. Unqualified blades will easily cause production shutdown. It is more cost-effective to choose blades with matched material and standard heat treatment, instead of buying cheap low-end blades with short service life.
Offer your plate thickness, metal material and shear machine model, we will recommend matched blade hardness and steel grade.
ALAS manufactures shear blades with D2, H13, LD, 9CrSi, Cr12MoV and powder metallurgy steel, drawing customization available. Send your working condition parameters to get official quotation and professional technical guidance.
