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Bimetallic White Iron

Duablock®

Overview

Duablock® is a composite material used in mining applications experiencing severe wear. This product consists of a white iron casting bonded to a backing plate. Duablock®’s wear resistant microstructure, along with its impact absorbing backing plate, makes it perfect for high abrasion and high impact applications.

Manufacture
The Duablock® casting is produced by Bradken’s in-house foundries where an automated moulding machine allows for high volume, low-cost manufacturing. A heat treatment process is used to create a metallurgical bond between the casting and mild steel backing plate, whilst maximising its wear and impact resistance.
Composition
The Duablock® casting is an enhanced white iron alloy based on O21988/JN/HBW555XCr16. The major alloying elements, chromium, carbon and molybdenum, give this material its superior abrasion and impact-resistant properties.
The typical chemical composition is given below:
Carbon

2.4%–3.6%

Silicon

0.2%–1.0%

Manganese

0.5%–1.5%

Chromium

14.0%–18.0%

Molybdenum

1.2%–3.4%

Microstructure

The microstructure of Duablock® is crucial in providing superior wear performance. The heat treatment cycle transforms the softer as-cast microstructure into hard, wear-resistant material. This microstructure consists of a network of interconnected eutectic M7 C 3 carbides in a martensitic matrix.

The typical properties are given below:
Bulk Hardness

650–750 HV50

Carbide Hardness

≥1200 HV0.5

Volume Fraction of Carbides

7500 kg/m3

Duablock® Bimetallic White Iron

Manufacturing Process

Manufacturing Process

Duablock® Microstructure

Duablock® Lined Chute

Resources

Download Duablock PDF - English
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Download Duablock PDF - Portuguese
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Download Duablock PDF- Spanish
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Download Duablock PDF- French Canadian
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Download Duablock PDF - Russian
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