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V-Chrome
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A new generation of differentially hardened alloy cast steel back up rolls has been developed to meet the ever advancing requirements of modern strip mills.
It was clear that there was a need for a back up roll whose campaign times could be substantially extended while retaining a good even wear profile that would maintain close gauge control.
This goal is achieved by the production of a monobloc static cast roll with an analysis derived in part from a family of tool steel materials. The rolls are produced to a high hardness level of up to 70 Shore C. The greatly enhanced wear properties produced can be related to a secondary hardening phenomenon that occurs during the complex heat treatment cycle applied. Examination of the microstructure reveals many very fine carbide globules present in a matrix of tempered acicular products.
Although presenting a real advance in roll technology, the rolls still retain the benefits of the traditional differentially hardened alloy cast steel materials, showing excellent durability, high strength and spall resistance.
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Applications
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| Product |
Type of Mill |
Position |
| Wide Strip |
Hot and Cold |
Backup Rolls |
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Typical Mechanical Properties
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N/mm2 |
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| Property |
Barrel Surface |
Journals & Axis |
| Tensile Strength |
1200 |
600 |
| Bending Strength |
1650 |
825 |
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Typical Hardness Gradient
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Micrograph x 500
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Typical Analysis
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| Code |
Leeb E |
Shore C |
C |
Si |
Mn |
Ni |
Cr |
Mo |
| V-Chrome |
680-710 |
65/70 |
0.3/0.7 |
0.3/0.8 |
0.3/1.0 |
1.0 max |
3.5/6.0 |
1.0/2.0 |
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