The working layer of an ULTIMA® roll consists of a highly alloyed martensitic matrix with a carefully controlled dispersion of high hardness complex carbides and differ significantly from the carbidespresent in conventional cast iron rolls. ULTIMA® meets the demands of different mill designs operating with a variety of rolling conditions, mill speeds and cooling conditions, but unlike many high-alloyed materials, ULTIMA® does not require complex cooling systems with high water pressure and bespoke spray systems.
| GRADE | ULTIMA®I | ULTIMA®II | ULTIMA®III | ULTIMA®IV | ULTIMA®V |
|---|---|---|---|---|---|
| APPLICATION | Rod and Bar Finishing Stands |
Rod and Bar Finishing Stands and Light Sections |
Oval and Round Passes in Intermediate Stands |
Spring Flats | Narrow Strip Mills |
| C% | 1.50-2.50 | 1.50-2.50 | 1.50-2.50 | 2.00-3.00 | 2.50-3.50 |
| Cr% + Mo% + W% | >8 | >8 | >8 | >12 | >2 |
| Ti% + V% + Nb% | >4 | >4 | >4 | >1 | >2 |
| Carbide% | 5-10 | 10-15 | 15-20 | 20-30 | 25-40 |
| HSc | 70-85 | 70-85 | 70-85 | 70-85 | 70-85 |
| Tensile Strength MPa | 700-900 | 700-900 | 700-900 | 600-800 | 200-400 |
| Bending Strength MPa | 900-1300 | 900-1300 | 900-1300 | 800-1000 | 300-400 |
| Modulus of Elasticity GPa | 225-235 | 225-235 | 225-235 | 190-120 | 110-140 |
| Microstructure |  |
 |
 |
 |
 |
*The hardness is obtained during a complex heat treatment process. For production, we need a range of 5 ShC which needs to be specified in the roll order.
Our technical team can help to determine the most suitable grade, degree of hardness and manufacturing method to meet with individual mill conditions and specifications.