1. Technical Parameters of Roll
When the material is GCr15, 9Cr2Mo, Cr12 and Cr12MoV,heat treatment quenching hardness: HRC60 ˚～ 63 ˚；
When the material is H13, 3Cr2W8V,heat treatment quenching hardness: HRC50 ˚～ 55˚；
High chromium alloy molybdenum vanadium heat treatment quenching hardness: HRC55 ˚～ 60 ˚, the service life is three times that of H13 and 3Cr2W8V.
2. Surface Roughness of Roll
Hole profile and inner hole surface: 0.8
End face and other surfaces: 1.6.
It is not allowed to have cracks, bumps, rust, etc. on the roll. The round corner of the aperture shall be smooth and free of edges and corners.
3.Accuracy Requirements
| Allowable tolerance of aperture radius R | ||||
| Five rolls in front | Roll after the sixth frame | Internal hole accuracy | Keyway width tolerance | Outer diameter and width |
| -3inch<(±0.05-0.15mm<) | -2<(±0.05mm<) | IT7 | 9 | 14 |
| 4inch and above<(±0.05-0.25mm<) | 3inch and above<(±0.08mm<) | |||