Alloy Definite Chill Rolls
Double Pour, Flake or Nodular Core.
Alloy definite chill rolls are double poured to maintain the desired level of toughness and thermal properties in the journals and barrel axis. The increased hardness is obtained by alloy additions mainly nickel. Chromium and molybdenum which modify the matrix structure to produce harder acicular phase. The core material can be either flake or nodular iron according to the requirement. The flake core display better thermal properties while the nodular iron achieves greater mechanical strength.
Application
These rolls are used in finishing stands of Bar mills and strip mills.
Chemical Composition
| Hardness Shore C | C | Mn | Si | Cr | Ni | Mo | S | P | UTS Kgf/mm. Sq. |
|---|---|---|---|---|---|---|---|---|---|
| 70-75 | 3.00 3.40 |
0.60 0.90 |
0.70 1.10 |
1.20 1.50 |
2.50 3.50 |
0.25 0.40 |
0.050 Max. |
0.10 Max. |
40-45 |
| 75-80 | 3.10 3.40 |
0.60 0.90 |
0.70 1.10 |
1.50 2.00 |
2.50 3.50 |
0.30 0.40 |
0.050 Max. |
0.10 Max. |
40-45 |
| Core Grey Iron |
3.00 3.30 |
0.40 0.70 |
1.30 1.50 |
0.30 Max. |
0.20 0.50 |
- | 0.050 Max. |
0.15 Max. |
20-25 |
| Ductile Nodular Iron |
3.00 3.30 |
0.40 0.70 |
1.30 2.00 |
0.30 Max. |
0.50 Max. |
- | 0.015 Max. |
0.10 Max. |
35-45 |
