| Hitachi Symbol |
Material Substance | Main Usage | Characteristics |
|---|---|---|---|
| FB-5 | 3%Cr Steel | Tandem Mill Back Up Roll Reversing Mill Back Up Roll |
General Use |
| FB-7 | 5%Cr Steel | Tandem Mill Back Up Roll Reversing Mill Back Up Roll |
High Hardness Deep Hardness penetration |
| NBR | Special Material | Continuous Tandem Mill Back Up Roll | Fatigue Resistance Wear Control |
| NBX | Special Material | Hot Strip Mill Back Up Roll for High Speed Steel Work Roll | Wear Resistance Abrasion Resistance |
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