Introduction:
Back up rolls are important spare parts in rolling mill. The quality of forging rolls directly affects the quality of sheets & coils. By our years of experience, we can supply good quality forging roll with uniformity hardness, premium wear resistance and anti-thermal crack performance.
1. No macroscopic segregation and few microscopic segregations.
2. Very few and subtle non-metal inclusion; dispersed distribution.
3. Compact and homogeneous structure.
4. High toughness and strength
5. Beneficial for improvement of anti-fatigue and heat impact ability of the roll.
Manufacturing:
Material and Properties:
The following table gives a general overview of our main grades for rolls and all kinds of the material are in forging process.
| Type |
Main Material |
Hardness |
Hardness Uniformity |
Depth of hardness |
Size |
| Back-up Roll |
9Cr2Mo (2% Cr) |
55-80 HSD |
4HSD |
30mm |
¢500-800mm |
| 70Cr3Mo (3% Cr) |
55-80 HSD |
4HSD |
60mm |
¢500-1800mm |
| 45Cr4NiMoV (4% Cr) |
55-80 HSD |
4HSD |
75mm |
¢1000-1800mm |
| YB-70 (5% Cr) |
55-80 HSD |
4HSD |
100mm |
¢1000-1800mm |
Applications:
The back up rolls are used in cold rolling mill of 4Hi, 6Hi reversing reduction mill and tandem mills, as well as temper mills and skin pass mills. ALso, the back up rolls are used in hot strip rolling mill.
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