The forged steel rolls for cold mills are widely applied to work rolls, intermediate rolls and back up rolls. The good performance of Lonsun rolls thanks to the high and homogeneous hardness in the work layer with superior wear ability, high toughness and excellence resistance to accident, and the depth of hardness layer may be over 30mm.
Chemical Composition
Symbol |
C |
Si |
Mn |
Cr |
Ni |
Mo |
V |
W |
FSC-1 |
0.80-0.95 |
0.15-0.45 |
0.20-0.55 |
1.70-2.40 |
≤0.25 |
0.20-0.40 |
0-0.15 |
- |
FSC-2 |
0.80-0.95 |
0.25-1.00 |
0.20-0.70 |
2.40-3.50 |
≤0.25 |
0.20-1.00 |
0.05-0.15 |
- |
FSC-3 |
0.75-0.95 |
0.20-1.00 |
0.20-0.50 |
2.80-3.60 |
≤0.80 |
0.15-0.40 |
- |
- |
FSC-4 |
0.60-0.80 |
0.30-0.80 |
0.40-0.90 |
2.50-3.50 |
≤0.80 |
0.20-0.60 |
- |
- |
FSC-5 |
0.70-0.95 |
0.20-0.90 |
0.20-0.50 |
4.00-6.00 |
≤0.80 |
0.15-1.20 |
≤0.35 |
- |
FSC-6 |
0.33-0.43 |
0.80-1.20 |
0.20-0.50 |
4.75-5.50 |
≤0.80 |
1.10-1.60 |
0.30-0.60 |
- |
FSC-7 |
0.80-0.90 |
≤0.40 |
≤0.40 |
3.80-4.40 |
≤0.80 |
4.50-5.50 |
1.75-2.20 |
5.50-6.75 |
Barrel Hardness (HS)
HARDNESS |
FSC-1 |
FSC-2 |
FSC-3 |
FSC-4 |
FSC-5 |
FSC-6 |
FSC-7 |
BERREL |
60-80 |
76-80 |
60-80 |
60-70 |
65-75 |
65-71 |
80-95 |
SURFACE |
90-100 |
90-100 |
90-100 |
65-80 |
90-100 |
75-82 |
- |
Recommended Hardness (HS)
Portion |
Application |
Hardness |
Barrel |
Finishing work rolls for strip and plate mills |
90-96 |
Cold work rolls and temper rolls for non-ferrous strip, foil and bright sheet |
≥95 |
|
Neck |
Small diameter cold work rolls installed with needle roller bearing |
≥80 |
Cold work rolls with particular requirement of resistance to wear on bearing portion |
50-70 |
|
Work rolls without special requirement |
30-50 |