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Special Alloy Cast Steel
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These are high alloy rolls which have been developed to meet the conditions in specific applications including backup rolls and vertical edging rolls.
The rolls are alloyed with manganese, chromium and molybdenum and are given a sophisticated multi-stage heat treatment to produce the combination of properties most appropriate for the mill duty.
The structure produced depends upon the hardness and the carbon content and varies from a fine pearlite to a very fine pearlite with some bainite. With the higher carbon rolls there will also be some free carbide present.
The high strength associated with good resistance to wear, spalling and firecracking make Special Alloy Cast Steel rolls very suitable for use in a range from backup rolls to early roughing work rolls.
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Applications
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| Product |
Type of Mill |
Position |
| Plate |
4 High |
Backup Rolls |
| Wide Strip |
2 & 3 High |
Roughing |
| Wide Strip |
4 High Continuous |
Backup Rolls |
| Wide Strip |
4 High Continuous |
Vertical Edgers |
| Wide Strip |
4 High Continuous |
Roughing & Early Finishing Work Rolls |
| Tube |
Pilger |
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Typical Mechanical Properties
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N/mm2 |
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| Property |
Low Carbon |
High Carbon |
| Bending Strength |
1375 |
1080 |
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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 |
| AS4 |
525-565 |
40-46 |
0.7/0.8 |
0.3/0.8 |
0.8/1.4 |
0.5 max |
1.3/1.9 |
0.2/0.6 |
| AS5 |
540-575 |
42-48 |
0.8/1.0 |
0.3/0.8 |
0.8/1.4 |
0.5 max |
1.3/1.9 |
0.2/0.6 |
| AS6 |
550-590 |
44-50 |
1.0/1.2 |
0.3/0.8 |
0.8/1.4 |
0.5 max |
1.3/1.9 |
0.2/0.6 |
| AS7 |
565-600 |
46-52 |
1.2/1.4 |
0.3/0.8 |
0.8/1.4 |
0.5 max |
1.3/1.9 |
0.2/0.6 |
| AS8 |
575-620 |
48-55 |
1.4/1.6 |
0.3/0.8 |
0.8/1.4 |
0.5 max |
1.3/1.9 |
0.2/0.6 |
| BH4 |
555-590 |
45-50 |
0.6/1.0 |
0.3/0.8 |
0.5/1.3 |
1.0 max |
1.5/2.5 |
0.2/0.5 |
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