Circular Slitter Blades | Premium Precision Tools for Metal Coil Slitting
1. What Are Circular Slitter Blades?
Circular slitter knives are vital precision cutting parts fitted on high-speed longitudinal slitting lines. They cut wide master metal coils into customized narrow strips, providing high-tolerance metal strips for global downstream manufacturing factories.
Blade precision determines edge quality for finished strips running on industrial slitting lines. Low-grade circular knives often cause burrs, edge rollover and dimensional errors, raising secondary machining costs and lowering material yield for metal steel service centers.
2. Core Application Fields
Coil Custom Slitting: Process carbon steel, stainless steel, aluminum and copper coils into required narrow strip sizes
Downstream Industrial Supply: Provide precision metal strips for auto parts, home appliance shells, hardware goods and electronic components
High-volume Industrial Production: Support continuous, large-batch slitting work for metallurgical factories and metal processing plants
3. Key Performance Advantages
3.1 High Hardness & Long Wear Resistance
Crafted from premium cold work die steel and alloy tool steel, treated with professional vacuum quenching plus multi-cycle tempering. It maintains stable hardness at HRC 58–62, with premium blades reaching up to HRC 64. Fine uniform grain structure extends blade service life, reduces tool change downtime for continuous slitting operations at metal steel service centers.
3.2 Micron-level Cutting Precision
Produced on ultra-precision CNC grinding equipment for high-speed longitudinal slitting lines. Controlled thickness tolerance reaches ±0.002 mm, with minimal radial and face runout. Slit metal strips come with burr-free, tear-free clean edges, requiring no secondary finishing for direct stamping and fabrication.
3.3 Full Customization & Universal Compatibility
Full customizable OD, ID, thickness, shear angle and cutting edge profile to match all brand slitting machines and workpiece metals. Fully compatible with imported and domestic high-speed longitudinal slitting lines for all metal processing workshops.
3.4 Stable High-speed Operation
Every finished blade undergoes professional dynamic balancing treatment. Rigid blade structure prevents wobble, deflection and deformation under 24/7 high-speed slitting. It ensures consistent strip width, minimizes defective goods and improves overall production yield for metal steel service centers.
4. Product Types
| Blade Type | Features | Applicable Scenarios |
| Standard Circular Slitter Knife | Standard disc structure, strong versatility | Ordinary slitting for carbon steel, stainless steel, aluminum and copper coils |
| Special-shaped Slitter Knife | Custom stepped / beveled non-standard edge design | Slitting thick plates, special alloys and high-strength hard-to-cut metals |
| Upper & Lower Paired Blade Set | Used in pairs for mutual shearing | Universal fit for all longitudinal slitting lines for all metal thicknesses |
5. Serving Industries
Metallurgy: Steel mills, aluminum plants and professional coil processing centers
Metal Fabrication: Precision sheet metal factories, strip slitting workshops
Automotive Manufacturing: Precision strip supply for vehicle structural parts and body panels
Home Appliance & Electronics: Stamping raw materials for shells, brackets and transformer cores
Special Material Processing: Galvanized steel, color-coated steel, copper and titanium strip slitting
6. Standard Manufacturing Workflow
6.1 Premium Raw Material Selection
Adopt high-toughness alloy steel, wear-resistant die steel and powder high-speed steel to enhance blade impact resistance and anti-fatigue performance.
6.2 Integrated Vacuum Heat Treatment
Adopt vacuum gas quenching + cryogenic treatment + multi-time tempering. Hardness deviation controlled within ±1 HRC. This process eliminates internal stress, refines metal grains and effectively prevents edge chipping and blade deformation.
6.3 Full CNC Precision Machining
Complete turning, milling, grinding and wire cutting via CNC equipment, controlling dimensional tolerance in every process to ensure stable finished precision.
6.4 Custom Edge Grinding
Sharp small-angle edge: For thin sheets and soft non-ferrous metals
Thickened large-angle edge: For thick plates, high-strength steel and hard alloys
6.5 Optional Surface Reinforcement
Optional nitriding, TiN coating and DLC coating reduce friction and metal adhesion. Mirror polishing protects coating layers when slitting galvanized and color-coated steel.
7. Blade Installation, Operation & Maintenance Guide
7.1 Pre-installation Inspection
Check blade edge for chipping, notches and collision scratches
Clean spindle and fitting surface completely; confirm correct assembly direction
Fasten bolts symmetrically with standard torque to avoid eccentric load
7.2 Clearance & Overlap Adjustment
Adjust lateral clearance and vertical overlap based on metal thickness, grade and tensile strength:
Excessive clearance: Serious edge burrs and corner collapse
Insufficient clearance: Accelerated edge wear, higher energy consumption and shorter service life
Tip: Test slitting first, optimize clearance parameters and record data for repeated use.
7.3 Daily Operation & Storage Rules
Clean metal chips and oil stains on blade edges during operation
Coat spare blades with anti-rust oil, store separately in professional blade boxes
Store blades in dry, flat environment; avoid collision and stacking extrusion
8. Material Selection Reference Table
| Processing Material | Recommended Blade Grade | Hardness (HRC) | Product Features |
| Stainless Steel Strip | Cr12Mo1V1 / D2 | 60–62 | Great edge retention, zero burr cutting, long service life |
| Mild Steel / Cold Rolled Steel | Cr12MoV / SKD11 | 58–60 | High impact toughness, fit for continuous mass production |
| Aluminum / Copper Non-ferrous Metal | High Speed Steel / Special Alloy Steel | 58–62 | Ultra-sharp edge, anti-sticking, smooth cutting performance |
| Galvanized / Color-coated Sheet | Mirror Polished Cr12MoV | 58–60 | High surface smoothness, protect original plate coating |
International Equivalent Tool Steel Grade Chart
| China GB | USA ASTM | Japan JIS | Germany DIN | Germany W-Nr | France NF | Russia GOST | UK BS |
| Cr12MoV | — | SKD11 | X165CrMoV12 | 1.2601 | — | X12M | — |
| Cr12Mo1V1 | D2 | — | X155CrMo12-1 | 1.2379 | X160CrMoV12 | — | BD |
| 4Cr5MoSiV1 | H13 | SKD61 | X40CrMoV5-1 | 1.2344 | X40CrMoV5 | 4X5MФ1С | BH13 |
| W18Cr4V | T1 | SKH2 | S18-0-1 | 1.3355 | HS18-0-1 | P18 | BT1 |
| W6Mo5Cr4V2 | M2 | SKH9 | S6-5-2 | 1.3343 | — | P6M5 | BM2 |
9. ALAS Heavy-duty Circular Slitter Knives
ALAS Machinery manufactures industrial rotary shear blades for long-cycle, heavy-load coil slitting work. Our blades deliver rigid body strength and sharp cutting edges, to eliminate edge burrs, reduce metal deformation and maximize raw material utilization.
9.1 ALAS Core Technical Strength
Micron-level precision: ±0.002mm thickness tolerance, low axial runout for accurate gap setting
Stable vacuum heat treatment: 58–64 HRC uniform hardness, stress relief, anti-chipping & anti-deformation
Mirror smooth surface: Prevent built-up edge and cold welding when cutting adhesive copper, aluminum and galvanized steel
9.2 ALAS Exclusive Blade Materials
Cr12MoV / D2 / SKD11 (58–62 HRC): Universal grade for carbon steel & stainless steel slitting
H13 / SKD61 (56–60 HRC): Optimized for hot rolled steel and thick plate heavy cutting
M2 / SKH51 High Speed Steel: Professional grade for ultra-thin metal foil and non-ferrous metal slitting
9.3 ALAS After-sales Maintenance Tips
Set knife clearance according to material thickness and tensile strength
Clean spindle and spacers before assembly to avoid blade shifting
Keep spare blades horizontal, anti-rusted and well-separated for storage
10. Why Choose ALAS Slitter Blades?
Factory Direct Supply: In-house CNC production, fast custom delivery, stable quality
Full-process QC: Strict inspection from raw material to finished shipment
Full Machine Adaptability: Standard & special blades fit all global slitting machine brands
One-stop Service: Free material selection, on-site installation, blade regrinding and full after-sales support
Final Note: Whether for high-strength steel, stainless steel or sticky non-ferrous metal slitting, ALAS circular slitter knives provide steady precision and long service life to safeguard your slitting line efficiency.
