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skd-11 steel plastic crusher blades for industrial granulator machines

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Plastic Crusher Blade

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Plastic Crusher Blade Material Selection Guide

The material of plastic shredder blades directly determines shredding effect, service life, and equipment stability. Different plastics—including hard & brittle, soft & tough, and fiber‑reinforced thick materials—have distinct requirements for blade hardness, toughness, and shear performance.

This guide matches suitable blade materials for three major plastic groups: ABS / PS / rigid PVC, PE / PP / PA / film, and Fiber‑reinforced / thick / mixed materials. It explains core characteristics, mechanical properties, chemical composition, and application scenarios to support professional material selection.

Plastic Characteristics & Blade Selection Principles

The hardness, toughness, and fiber content of plastics create different stress conditions during shredding:

Hard & brittle plastics generate strong instantaneous impact

Soft & tough plastics easily wrap around blades and cause adhesion

Fiber‑reinforced plastics cause severe edge wear

Blade selection follows these principles:

Hard plastics: high hardness, wear resistance, impact resistance

Soft plastics: high toughness, strong shear force, smooth cutting surface

Fiber‑reinforced materials: ultra‑high wear resistance, chipping resistance

Accurate material matching reduces operating costs and improves crushing efficiency.

Blade Materials for Hard & Brittle Plastics

Application Scope

ABS, PS, hard PVC, hard plastic profiles, rigid plastic blocks

Material Performance Requirements

These materials are hard and brittle. During crushing, blades endure strong impact, which can cause chipping, cracking, and rapid dulling. Blades must have high hardness, wear resistance, and impact toughness.

Recommended Material: SKD‑11

SKD‑11 is a high‑carbon, high‑chromium alloy tool steel widely used for precision crushing blades.

Chemical Composition of SKD‑11

C: 1.40–1.60%

Cr: 11.00–13.00%

Mo: 0.80–1.20%

V: 0.20–0.50%

Si: 0.40% max

Mn: 0.60% max

High carbon and chromium provide strong hardness and wear resistance; molybdenum and vanadium improve toughness and dimensional stability.

Core Mechanical Properties

Hardness after heat treatment: HRC 60–64

Excellent wear resistance and edge retention, maintaining a sharp cutting edge for a long time

Good impact toughness, resistant to chipping and breakage during impact from hard plastics

High edge strength, suitable for high‑speed cutting of hard brittle materials

Advantages in Application

Reduces frequent sharpening and blade replacement, lowering maintenance costs

Withstands instantaneous impact force during hard plastic crushing, ensuring stable operation

Maintains consistent shredding effect for long-term use

Blade Materials for Soft & Tough Plastics

Application Scope

PE, PP, PA, soft PU, plastic film, woven bags, soft sheets

Material Performance Requirements

Soft plastics have high elasticity and ductility. They are difficult to cut cleanly and tend to wrap around blades or stick to edges. Blades need high toughness, strong shear capacity, and finely ground smooth surfaces.

Recommended Material: 9CrSi

9CrSi is a classic chromium‑silicon alloy tool steel suitable for general soft plastic crushing. For ultra‑thin films and woven bags, special alloy tool steel can be used.

Chemical Composition of 9CrSi

C: 0.85–0.95%

Cr: 1.20–1.50%

Si: 1.00–1.30%

Mn: 0.30–0.60%

P: 0.030% max

S: 0.030% max

Chromium enhances hardness and wear resistance, while silicon improves toughness and heat resistance, making it suitable for the continuous shearing of soft plastics.

Core Mechanical Properties

Hardness after heat treatment: HRC 58–62

High toughness, not easy to break or chip during high‑speed shearing motion

Good machinability, supporting precise grinding of the cutting edge to achieve a smooth surface

Moderate wear resistance, matching the low‑abrasion characteristics of soft plastics

Advantages in Application

Smooth cutting edge reduces material wrapping and adhesion, ensuring efficient shredding

Cost-effective, avoiding unnecessary waste for small-batch or regular soft plastic crushing

Easy to process and sharpen, reducing maintenance difficulty

Blade Materials for Fiber‑Reinforced / Thick / Mixed Materials

Application Scope

Glass fiber reinforced plastics, carbon fiber composites, thick plastic blocks, mixed waste plastics, hard thick plates

Material Performance Requirements

Fiber additives cause severe abrasive wear. Thick and mixed materials subject blades to combined stress: impact, abrasion, and shear. This places the highest demand on overall blade performance.

Recommended Material: DC‑53

DC‑53 is a high‑strength, high‑toughness alloy tool steel designed for heavy‑duty crushing, with better comprehensive performance than SKD‑11.

Chemical Composition of DC‑53

C: 1.00–1.10%

Cr: 7.50–8.50%

Mo: 1.80–2.20%

V: 0.20–0.50%

Si: 0.10–0.35%

Mn: 0.20–0.50%

Higher molybdenum content than SKD‑11 significantly improves toughness and high‑temperature stability, while appropriate chromium content ensures wear resistance.

Core Mechanical Properties

Hardness after heat treatment: HRC 62–65

Superior wear resistance compared to SKD‑11, effectively resisting wear from fiber-reinforced materials

Excellent chipping and fracture resistance, adapting to the strong impact of thick material crushing

Good high-temperature stability; the cutting edge is not easily deformed during long-term continuous crushing

Advantages in Application

Significantly extends blade service life when crushing fiber-reinforced plastics, reducing replacement frequency

Withstands complex stress from mixed materials, ensuring stable operation and consistent shredding effect

Suitable for heavy-duty continuous work, improving equipment productivity

Common Mistakes & Practical Selection Recommendations

Avoid Blind Selection of High‑End Materials

Using SKD‑11 or DC‑53 for small‑batch soft plastic waste causes unnecessary cost increases. For soft plastics, 9CrSi is sufficient; match materials according to plastic types: hard plastics with SKD‑11, fiber / thick / mixed materials with DC‑53.

Do Not Use Non‑Standard Blade Sizes

Incorrect dimensions lead to uneven assembly gaps, abnormal vibration, and long-term damage to blade shafts and the crusher body. Always use original or standard-sized blades.

Do Not Ignore Edge Precision

Rough edges worsen wrapping and adhesion when processing soft plastics. Always use precision‑ground blades to maintain shredding efficiency and reduce equipment failure.