Sidebar

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