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Hot Rolling Mill Rolls
The high Ni-Cr indefinite chill cast iron roll is manufactured by centrifugal composite casting. The core is made of high-strength ductile cast iron, and the working layer is made of high Ni-Cr cast iron. It features high wear resistance, excellent spalling resistance and good crack resistance.
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Material Characteristics
The matrix structure of the high Ni-Cr roll consists of bainite + 25-30% carbides + 2-3% graphite. The main carbide type is Fe₃C, supplemented by (Fe·Cr)₃C. The matching of graphite and carbides achieves a balance between wear resistance and thermal crack resistance.
Application Scope
Suitable for work rolls in the later finishing stage of hot continuous rolling, ESP and CSP mills, as well as work rolls and backup rolls in leveling stands.
Chemical Composition
|
Position |
C |
Si |
Mn |
Cr |
Mo |
Ni |
Mg |
|
Working Layer |
3.0-3.8 |
0.50-1.30 |
0.50-1.30 |
1.40-2.20 |
0.20-1.00 |
4.0-4.8 |
- |
|
Core |
3.0-3.6 |
1.5-2.5 |
0.3-0.7 |
- |
- |
- |
0.04-0.08 |
Working Layer Microstructure and Properties
|
Material |
Roll Body Hardness (HSD) |
Roll Body Hardness Uniformity (HSD) |
Hardness Drop (HSD) |
|
High Nickel-Chromium |
70-80 |
5 |
5 |
Core Microstructure and Properties
|
Material |
Hardness (HSD) |
Tensile Strength (MPa) |
Impact Toughness (J/cm²) |
|
Pearlitic Ductile Cast Iron |
35-45 |
≥450 |
2-4 |
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