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Hot Rolling Mill Rolls
The high chromium steel centrifugal work roll is produced by the centrifugal casting method. The core material is high-strength ductile cast iron, and the working layer is a cast steel material containing alloying elements such as Cr, Mo, Ni, and V. The matrix structure consists of tempered martensite + carbides + a small amount of retained austenite.
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Material Characteristics
After differential heat treatment, the high chromium steel roll has improved matrix structure uniformity, more complete transformation of retained austenite, and a more stable stress state. It exhibits excellent comprehensive high-temperature properties such as good wear resistance, thermal crack resistance, and bite performance.
Application Scope
Suitable for roughing work rolls of hot continuous rolling mills.
Chemical Composition
|
Position |
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Mo |
V |
Mg |
|
Working Layer |
1.0-1.8 |
0.3-1.0 |
0.5-1.3 |
≤0.2 |
≤0.03 |
10-18 |
1.0-1.8 |
1.5-2.3 |
0.2-1.0 |
- |
|
Core |
3.2-4.0 |
2.0-3.0 |
0.2-1.0 |
≤0.2 |
≤0.03 |
Trace |
Trace |
Trace |
Trace |
≥0.04 |
Working Layer Microstructure and Properties
|
Material |
Roll Body Hardness (HSD) |
Roll Body Hardness Uniformity (HSD) |
Hardness Drop (HSD) |
|
High Chromium Steel |
75-85 |
3 |
3 |
Core Microstructure and Properties
|
Material |
Roll Body Hardness (HSD) |
Roll Body Hardness Uniformity (HSD) |
Hardness Drop (HSD) |
|
High Chromium Steel |
75-85 |
3 |
3 |
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