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PF 301
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 PF 301

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)
                           
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
--
 
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
 
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.)
 
 

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
Back-up rolls
o
o
o
2-Hi mills
Work Rolls
o
o
HC mills
Work rolls
o
o
o
o
Intermediate rolls
o
o
o
o
Back-up rolls
o
o
o
Multi-roll mills
Work rolls
o
1st intermediate rolls
o
o
2nd intermediate rolls (drive)
o
o
o
2nd intermediate rolls (idler)
o
o
Back-up rolls
o
Non-ferrous mill rolls
 
4-Hi mills
Work rolls
o
o
o
Back-up rolls
o
o
o
o
2-Hi mills
Wrok rolls
o
o
Multi-roll mills
Work rolls
o
o
1st intermediate rolls
o
o
2nd intermediate rolls (drive)
o
o
o
2nd intermediate rolls (idler)
o
o
Back-up rolls
o
xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx
   

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