High Chromium Cast Iron Composite

Wear-Resistant Material Overview

High chromium cast iron is a third-generation wear-resistant material. It offers high hardness with some toughness.

However, cracks and breakage have often been seen due to low toughness. To fix this, a new composite method has been used.

Composite Material Innovation

A layer of carbon steel is added under the high chromium cast iron. This steel base is tough and absorbs impact.

As a result, the whole material becomes tougher while keeping its hardness and wear resistance.

✅ Key Features:

• Bonding strength: Over 300 MPa

• Surface hardness: Over 63 HRC

• Impact toughness: Over 140 J/cm²

• Easy to weld, screw, or cut

Technical Features

🔥 High-Temperature Furnace Compounding

A special furnace process removes chromium oxide from the surface. It bonds the layers tightly and lowers stress by slow cooling.

🔬 Microstructure Adjustment

Heat treatment changes the structure:

• Top Layer (Cast Iron): Martensite, residual austenite, and fine carbides

• Base Layer (Steel): Pearlite and ferrite

⚙️ Performance Design

The thickness of each layer can be changed to match different uses. This helps balance wear resistance and structure.

💪 Overall Performance

This material performs better than single-layer materials. It offers:

• High surface hardness (HRC > 63)

• Strong layer bonding (> 200 MPa)

• High impact toughness (> 140 J/cm²)

Technical Principles

📉 Wear Behavior

The wear process follows the PARIS formula:
da/dN = C(ΔK)^n and h = Gb / 4π(1-γ)σf

⚙️ Functional Gradient Design

• Hard top layer: High chromium cast iron

• Tough base: Steel

• Smooth transition: Multi-layer alloy layer (less than 0.5 mm thick)

Product Innovation

💡 Hardness + Toughness Combined

The new material solves the old problem of poor toughness. A strong bond is created using a gradual transition layer.

🏭 Applications

This material is used in:

• Mining

• Metallurgy

• Power plants

• Cement plants

• Sugar factories

• Brick making

• Roadwork

It helps reduce metal loss from wear.

🛠 Production Advantage

Compared to traditional welding and casting, this method:

• Removes dilution layers

• Improves bonding

• Reaches shear strength up to 300 MPa