TSR | Expert of Mill Rolls
Trust Stemming from Reliability
Cast Back Up Rolls are produced to a high hardness level of up to 75 HSC through a Differential Hardening process. The superior wear and mechanical hardening resistance are related to the bainitic / martensitic matrix and complex carbides finely distributed. In the Differential Hardening process the monoblock rolls are first heat treated to produce a fine pearlite necks and core structure followed by the differential hardening of the working layer (Austenitize, water quench and double tempering) to develop the optimum microstructure in the working layer.
The rolls are monoblock cast so no shell / core interface problems.
| MATERIAL | GRADE | CHEMISTRY |
BARREL HARDNESS (HSC) |
|||||
| C | Si | Mn | Cr | Ni | Mo | |||
| Cast Back-up Roll | 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 | 55-62 |
| 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 | |
| TYPICAL PHYSICAL PROPERTIES | |||
| Neck Hardness (HSC) | Tensile Strength (N/mm2) | Unevenness of Barrel Surface Hardness (HSC) | Difference of Shell Thickness |
| ≤42 |
shell ≥1500 core & necks ≥750 |
＜3 | ＜10 |
Hardness Distribution
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