|
CHARACTERISTICS |
The shell of such rolls is
highly wear resistant having minimal drop in
hardness with a good strength to thermal shock,
fracture toughness & resistance to oxidation at
high temperatures. The oxide layer, once formed,
has a good strength to retain it for a longer
period during operation imparting uniform
surface of the roll and ultimately that of the
rolled sheet. The shell matrix contains
martensite, bainite and carbides which impart
excellent wear resistance.
It is recommended to keep the core as nodular
iron (SG Iron). Better roll cooling is is
required for these rolls in the mill. |
|
APPLICATION |
| These rolls are suitable for
initial finishing stands of Hot Strip Mills,
Plate Mills, Skin Pass Mills and finishing for
Checker Plant rolling. |
|
| CHEMICAL
COMPOSITION (SHELL) |
|
C |
Si |
Ni |
Cr |
Mo |
V |
- |
- |
|
2.40 |
0.40 |
1.00 |
15.00 |
1.00 |
0.15 |
- |
- |
|
2.90 |
0.80 |
1.60 |
16.00 |
1.50 |
0.45 |
- |
- |
| CHEMICAL
COMPOSITION (SC CORE) |
|
C |
Si |
Ni |
Cr |
Mo |
V |
- |
- |
|
2.50 |
1.90 |
1.00 |
0.60 |
- |
0.03 |
- |
- |
|
3.00 |
2.70 |
Max |
Max |
- |
0.07 |
- |
- |
| MECHANICAL
PROPERTIES |
|
|
|
65-75(In steps of 5°ShC)
|
|
75-85(In steps of 5°ShC) |
|
|
Neck Properties
(SG Core) |
|
Hardness (°Sh-C) |
U.T.S (N/mm2 |
Impact (J/cm2) |
|
35-45 |
400-500 |
3.50 max |
|
