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PF
301
|
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Forged
steel rolls include work and back-up rolls for
cold rolling. For this purpose, the
state-of-art facilities are employed in
manufacturing these rolls, of which are
steel-making (EAF), refining (ESR or LF/VD)
and forging (3150t hydraulic press) equipment
to produce the high quality forged steel
blanks. As for heat treatment equipment, the
reproducibility of barrel hardness and the
depth of hardness are guaranteed by mean of
the computer control; As for the heat
treatment procedure, we take on the
pre-heat-treatment, the specific
induction-heating quenching (progressive or
integral), the cold treatment and the
tempering, so as to provide the rolls with
high and homogeneous hardness in the work
layer with superior wearability, high
toughness and sufficient resistance to
accident, the depth of hardened layer may be
over 30mm, so when these high quality work
tolls are applied on the modern wide cold
strip mills at home and abroad, the
satisfactory performance have been obtained.
Typical
High Quality Product of Forged Steel Roll -
Cold Strip Mill Rolls:
The
cold strip mill is a modernistic and new type
mills, since the quality requirement of the
strip steel products is very high, then the
strict demands hace been put to the work rolls.
This type of roll manufactured by PFC, such as
the work rolls used on the 1700mm cold strip
mill of Wu han Iron & Steel Corp. more than
1000 pieces have been provided. The practice
proved that it appears a high rolling tonnage
between roll change, lower roll-consumption and
long service life, the reputations have been
gained from users.
Microstructure:
The
microstructure of barrel surface corresponding
with high and homogeneous hardness, consists of
cryptocrustalline and fine acicular martensite,
fine and uniform carbide and a little of
residual austenite..
|
|
|
 |
|
Chemical
composition(%)
|
| Symbol |
C
|
Si
|
Mn
|
Cr
|
Ni
|
Mo
|
v
|
|
| FSC-1 |
0.85-0.95
|
0.25-0.45
|
0.20-0.35
|
1.70-2.10
|
<
0.25
|
0.20-0.40
|
--
|
|
| FSC-2 |
0.80-0.90
|
0.15-0.45
|
0.20-0.55
|
1.80-2.40
|
<
0.25
|
0.20-0.40
|
0.05-0.15
|
|
| FSC-3 |
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-4 |
0.75-0.95
|
0.20-1.00
|
0.20-0.50
|
2.80-3.60
|
<
0.80
|
0.15-0.40
|
--
|
|
| FSC-5 |
0.60-0.80
|
0.30-0.80
|
0.40-0.90
|
2.50-3.50
|
<
0.80
|
0.20-0.60
|
--
|
|
| FSC-6 |
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-7 |
0.80-1.00
|
0.20-0.90
|
0.20-0.40
|
7.50-8.50
|
<
0.80
|
0.25-1.20
|
0.10-0.40
|
|
| FSC-8 |
1.35-1.70
|
<
0.40
|
0.20-0.65
|
11.0-13.0
|
--
|
0.40-1.00
|
0.15-0.30
|
(0.30-0.60)(Co)
|
| FSC-9 |
0.33-0.43
|
0.80-1.20
|
0.20-0.50
|
4.75-5.50
|
--
|
1.10-1.60
|
0.30-0.60
|
|
| FSC-10 |
0.80-0.90
|
<
0.40
|
<
0.40
|
3.80-4.40
|
--
|
4.50-5.50
|
1.75-2.20
|
5.50-6.75(W)
|
| |
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BARREL
HARDNESS (HS)
|
|
FCS-1
|
FCS-2
|
FCS-3
|
FCS-4
|
FCS-5
|
FCS-6
|
FCS-7
|
FCS-8
|
FCS-9
|
FCS-10
|
|
60-70
|
60-80
|
76-80
|
60-80
|
60-70
|
65-75
|
75-85
|
77-85
|
65-71
|
80-95
|
|
90-100
|
90-100
|
90-100
|
90-100
|
65-80
|
90-100
|
90-100
|
86-90
|
75-82
|
--
|
| |
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HARDNESS
RECOMMENDATION
(HS)
|
|
PROTION
|
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
|
|
Note:
Hardness
homogeneity of
barrel is
generally <
3 HS
|
| |
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HARDENING
DEPTH OF BARREL:
|
|
Diameter
of barrel (mm)
|
>
£X 300
|
£X
301-600
|
£X
601-1020
|
|
Hardening
depth (mm)
|
>
8
|
>
10
|
8-12
|
| The
minimum hardening
depth of work rolls
symbolized with
FSC-1 can be
guaranteed
respectively
according to the
nominal diameter as
the table above, the
hardening depth of
work rolls for other
symbol will be
provided according
to bilateral
agreement. |
| |
|
THE
CAPACITY OF MAKING
|
|
Diameter
of barrel (mm)
|
Length
of barrel (mm)
|
weight
(t)
|
|
£X1020
(Max.)
|
3500
(max.)
|
12
(Max.)
|
| |
| |
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APPLICATION
OF FORGED STEEL
ROLLS FOR COLD
ROLLING MILLS
|
|
MILL TYPE
|
ROLL TYPE
|
FSC
|
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
|
Rolls for cold
plate and strip
mills
|
|
|
4-Hi mills
|
Work rolls
|
o
|
o
|
o
|
o
|
|
o
|
|
|
|
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Back-up rolls
|
|
o
|
o
|
|
o
|
|
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|
|
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|
2-Hi mills
|
Work Rolls
|
o
|
o
|
|
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|
HC mills
|
Work rolls
|
|
|
|
o
|
|
o
|
|
o
|
|
o
|
|
Intermediate rolls
|
|
o
|
o
|
o
|
o
|
|
|
|
|
|
|
Back-up rolls
|
o
|
o
|
|
|
o
|
|
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Multi-roll mills
|
Work rolls
|
|
|
|
|
|
|
|
|
|
o
|
|
1st intermediate
rolls
|
|
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|
o
|
o
|
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|
2nd intermediate
rolls (drive)
|
|
|
|
|
|
|
o
|
o
|
o
|
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2nd intermediate
rolls (idler)
|
|
|
|
|
|
|
|
o
|
o
|
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Back-up rolls
|
|
o
|
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Non-ferrous mill
rolls
|
|
|
4-Hi mills
|
Work rolls
|
o
|
o
|
o
|
|
|
|
|
|
|
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Back-up rolls
|
o
|
o
|
|
o
|
o
|
|
|
|
|
|
|
2-Hi mills
|
Wrok rolls
|
o
|
o
|
|
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|
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|
|
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|
Multi-roll mills
|
Work rolls
|
|
o
|
|
|
|
|
|
|
|
o
|
|
1st intermediate
rolls
|
|
|
|
|
|
|
|
o
|
o
|
|
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2nd intermediate
rolls (drive)
|
|
|
|
|
|
|
o
|
o
|
o
|
|
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2nd intermediate
rolls (idler)
|
|
|
|
|
|
|
|
o
|
o
|
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Back-up rolls
|
|
o
|
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xxxx |
xxxx |
xxxx |
xxxx |
xxxx |
xxxx |
xxxx |
xxxx |
xxxx |
xxxx |
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