Rotary Slitter Blades: Definition & Uses
What Are Rotary Slitter Blades?
Rotary slitter blades (also called circular slitter knives) are high-precision round cutting tools.
They are used on metal coil slitting lines.
They work in pairs (upper and lower) and rotate at high speed.
Their job is to cut wide metal coils into narrow, custom-width strips with clean edges.
These blades are made from strong materials:
Alloy tool steel (D2)
High-speed steel (HSS)
Cemented carbide
After precision grinding and heat treatment, they are:
Hard and durable
Wear-resistant
Stable in size
They are the most important cutting part of a metal slitting line.
What Are Rotary Slitter Blades Used For?
Main Purpose
High-speed, high-precision longitudinal cutting of metal coils.
Materials They Cut
Carbon steel, hot-rolled and cold-rolled steel
Stainless steel, galvanized steel, color-coated steel
Aluminum, aluminum foil, copper, brass
Special alloys and titanium strips
Common Industries
Steel mills and metal service centers
Metal processing factories
Automotive industry
Home appliance manufacturing
Hardware production
Special metal material processing
Typical Applications
Cut large coils into fixed-width strips
Make custom narrow strips for further processing
Produce parts for cars, appliances, and hardware
Cut coated materials without damaging surfaces
Blade Metal Materials International Grade Corresponding Table
China (GB) | USA(ASTM) | Japan (JIS) | Germany (DIN) | Germany (W-Nr) | France (NF) | Russia (ROCT) | U.K (BS) |
Cr12MOV | - | SKD11 | X165CrMov12 | 1.2601 | - | X12M | - |
Cr12Mo1V1 | D2 | - | X155Cr12Mo12 | 1.2379 | X160CrMoV12 | - | BD |
4Cr5MoSiVI | H13 | SKD61 | X40CrMoV5-1 | 1.2344 | X40CrMoV5 | 4X5MO1C | BH13 |
LD | - | - | - | - | - | - | - |
W18Cr4V | T1 | SKH2 | S18-0-1 | 1.3355 | HS18-0-1 | P18 | BT1 |
W6Mo5Cr4V2 | M2 | SKH9 | S6-5-2 | 1.3343 | - | P6M5 | BM2 |
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Why Choose Our Rotary Slitter Blades?
Source Manufacturer
Own production workshop, complete CNC machining equipment, support for customized orders, and controllable delivery time;
Quality Assurance
Full-process quality inspection, from material selection to finished products, ensuring blade accuracy and wear resistance;
Full Specification Compatibility
Covering round, irregular, upper/lower blades, compatible with all models of slitting machines, meeting the processing needs of different industries;
After-Sales Support
Providing one-stop service including blade selection, installation guidance, and precision grinding and repair, solving processing problems.
Slitting Machine Blades
Stainless Steel Slitting Blades
Steel Strip Slitting Blades
Cemented Carbide Slitting Blades
For ordinary carbon steel strip (cold-rolled/hot-rolled), Cr12MoV or SKD-11 blades are recommended, used with standard round blades or paired blades. Their Rockwell hardness is HRC 58–60. These blades offer excellent toughness, wear resistance, and stable service life, making them suitable for high-volume, routine slitting operations.
For stainless steel strip (304, 316, 430), Cr12MoV1 or D2 blades are recommended, used with round blades or paired blades. The hardness should be controlled at HRC 60–62. These blades offer strong wear resistance, are less prone to chipping, and achieve burr-free and non-burring slitting results.
For soft non-ferrous metals such as aluminum, copper, and brass, high-speed steel (HSS) or alloy tool steel blades are recommended, used with precision-ground round blades. This ensures a smooth cut surface and effectively reduces material adhesion to the blade and surface scratches.
For galvanized and color-coated strips, Cr12MoV material blades are selected and used with mirror-polished round blades; the hardness is HRC 58–60, and the surface is nitrided or mirror-polished; this can effectively protect the coating on the strip surface and avoid zinc loss, paint scratches and other issues during the slitting process.