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Back up rolls are used to support the work roll of hot strip mill, because the rolling force of strip roll is relatively large. the microstructure of the back up rolls are bainitic / martensitic matrix and complex carbides finely distributed. And there are two production processes, static casting and forging.
Chemical component:| Grade | C | Si | Mn | Cr | Ni | Mo | Barrel Hardness (HSD) |
| 3%Cr | 0.30-0.50 | 0.30-0.60 | 0.40-1.0 | 2.50-3.50 | 0.60-1.50 | 0.30-0.60 | 55-65 |
| 4%Cr | 0.30-0.50 | 0.30-0.60 | 0.40-1.0 | 3.50-4.50 | 0.60-1.50 | 0.30-0.60 | 60-65 |
| 5%Cr | 0.30-0.50 | 0.30-0.60 | 0.40-1.0 | 4.50-5.50 | 0.60-1.50 | 0.50-0.80 | 65-75 |
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