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Hot Rolling Mill Rolls
Semi-high speed steel roll is a type of multi-element alloy cast steel roll. With a chromium (Cr) content of over 5% and the addition of alloying elements such as molybdenum (Mo) and vanadium (V), it is a newly developed material and the preferred choice for modern cold rolling mills to produce high-grade steel sheets.
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Material Characteristics
Due to the further increase in alloy content (Cr, Ni, Mo, V, etc.), the amount of M₂C and MC carbides in semi-high speed steel increases accordingly. The fine and uniformly distributed high-hardness carbides further improve the wear resistance and surface roughness retention of the roll. After tempering, this material exhibits a significant secondary hardening effect, and increasing the tempering temperature significantly enhances the accident resistance of the roll.
Application Scope
Suitable for roughing work rolls of hot strip steel mills; work rolls and intermediate rolls of cold strip steel mills.
Roll Performance Parameters
|
Roll Application |
Hardened Layer Depth (mm) |
Roll Body Hardness (HSD) |
Roll Body Hardness Uniformity (HSD) |
Roll Neck Hardness (HSD) |
|
Work Roll / Intermediate Roll |
>45 |
70-103 |
≤3 |
35-70 |
Working Layer Microstructure and Properties
|
Material |
Roll Body Hardness (HSD) |
Roll Body Hardness Uniformity (HSD) |
Hardness Drop (HSD) |
|
High Chromium Steel |
75-85 |
3 |
3 |
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