EN
EN
Hot Rolling Mill Rolls
The Cr3-Cr5 alloy cast steel backup roll features a working layer made of high-strength high-alloy steel and a core made of high-strength ductile iron. Through optimized heat treatment processes, the working layer is heated to a high temperature and then quenched by atomization, forming a uniformly refined bainite matrix. Its normal temperature structure consists of a bainite matrix + granular carbides.
Share:
Material Characteristics
Produced by centrifugal casting, the working layer has a dense structure and fine equiaxed grains. Strengthening grain boundary elements are used in the chemical composition to fully strengthen the structure. At the same time, alloys that improve the high-temperature strength of the material are added, significantly increasing the high-temperature thermal strength of the working layer. It exhibits high strength, excellent toughness, and fatigue resistance.
Application Scope
Suitable for backup rolls in the finishing and roughing stands of cold and hot strip steel mills, as well as those in medium and heavy plate mills, coil coating machines, and levelers.
Chemical Composition
|
Element |
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Mo |
V |
|
Cr3 |
0.4-0.6 |
0.2-0.6 |
0.6-1.2 |
≤0.035 |
≤0.030 |
2-3.5 |
0.3-0.8 |
0.3-0.7 |
0.15 |
|
Cr4 |
0.4-0.6 |
0.5-0.7 |
0.6-0.8 |
≤0.030 |
≤0.025 |
3.84 |
0.3-0.8 |
0.3-0.7 |
0.05-0.1 |
|
Cr5 |
0.4-0.6 |
0.4-0.7 |
0.5-0.8 |
≤0.030 |
≤0.025 |
4.2-5.5 |
0.3-0.8 |
0.3-0.7 |
0.05-0.2 |
Microstructure and Properties
|
Material |
Roll Body Hardness |
Hardness Uniformity |
Hardness Drop (HSD) |
Roll Neck Hardness (HSD) |
Tensile Strength (Mpa) |
|
Cr3 |
55-65 |
3-5 |
3-5 |
≤45 |
≥600 |
|
Cr4 |
60-70 |
3-5 |
3-5 |
≤45 |
≥600 |
|
Cr5 |
60-75 |
3-5 |
2-4 |
≤45 |
≥700 |
Related Products
