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4-Hi Cold Rolling Mill


Due to different numbers of rollers, the metal coil cold rolling mill is divided into 2 Hi, 4 Hi, 6 Hi, and 12 Hi AGC.
The 4-Hi cold rolling mill, one of metal coil cold rolling mill, is made from good quality raw material. A four-high cold rolling mill has four rolls, two small and two large. The two small rolls are work rolls in contact with metal coil, and the two large rolls are backup rolls which contact the back side of the small work rolls. At the same time, we are upgrading with the latest technological equipments when producing this cold rolling mill.


1. The 4-Hi cold rolling mill is a kind of portable type.
2. One stand and two frames are made from fabricated steel plates.
3. The number 2 Rolls on this cold rolling mill are made of chilled material.
4. It is equipped with heavy duty reduction gear.
5. The screw down system is manual.
6. We adopt one number C.I. casting flywheels.
Due to the different of many aspects, such as input coils, output coils, max roiling force and max rolling force, etc, the 4-Hi cold rolling mill is divided into 8 types:

The detail specification as follows:

1. Φ175/Φ450×450 4 Roller Reversible Cold Rolling Mill

Input and Output:
Input coils: max 3mm coil thickness, max 370mm width
Output coils: min. 0.3mm thickness, max 370mm width
Coil Specification:
(1) Inner diameter: 508mm
(2) Outer diameter: 1500mm
(3) Max.coil weight: 10T
Max.rolling force: 3000KN
Max.rolling speed: 120m/min
Recoiling tension: max 40KN
Main motor: 320KW DC, V=680/1600r/min
Material of rollers: 9Cr2Mo
Press-down motor: YZ2-11KW
Column section size: 250×310mm
Layout flow:
Coil car, left recoiler/decoiler-----4-hi cold rolling mill----right recoiler/decoiler

2. Φ225×850/Φ700×820 Four Roller Reversible Cold Rolling Mill

Coil material: carbon steel Q195, Q235, 08AL, SPHC, SPHD, etc.
Input coil: 2.0~4.0×600~750 mm
Finished coil: 0.3~1.0×600~750 mm
Max rolling force: 6500KN
Max rolling speed: ≤480 m/min
Installation power of the rolling mill: 3300KW
Layout Flow:
Coil loading----Decoiler (CPC)---pinch feeder ---- Recoiler (left) ----4-hi reversible cold rolling mill-----Recoiler (right)----coil discharging.
Electric Control:
DC drive electric control system: Simens
PLC control


1. The second type of cold rolling mill controls rolling speed and its tension.
2. The stable rolling is ensured.
3. This machinery great guarantee the safety.
Hydraulic AGC System
Functions: AGC (hydraulic control of press-down seam), AFC (constant rolling force control), pre-control of thickness gauge, monitoring, etc
Stable rolling: 0.3mm ±4.5μm; 0.5-0.8mm ±7μm
Speed-up and speed-down rolling: 2%h≤±10μm

3. Φ180/Φ650

×850 Stainless Steel Four Roller Reversible Cold Rolling Mill

Material: Stainless steel 201, 304, 430
Input thickness: 3.0mm, input width: 750mm
Finished thickness: 0.3mm, finished width: 750mm
Rolling speed: V≤120m/min, rolling pressure: P≤8000KN
Electric motor press-down: YZ model, 30KW×2
Two stands: closed style, section size 410×500mm
Hydraulically balance upper rollers and lower rollers
Work rollers: work roller diameter × working surface width Φ180×850mm (Φ165×850mm), and rolling bearing
Support rollers: diameter × working surface width Φ650×820mm, FCDP80112410 bearing
Driving style: drive support rollers.
Main motor: Z560-3A, N=630KW, n=424/1200rpm, I=1559A (Made by Hengli in Hangzhou)
Structure of recoiling block: hydraulic rectangular pyramid Φ500×850mm
Z4-355-32, N=355KW, n=600/1600rpm, I=877A

4. Φ60/Φ200×250 Four Hi Non-Ferrous Metal Reversing Cold Rolling Mill

Coil material: non-ferrous metal
Input thickness and width: max 2mm, 180mm
Output thickness: min. 0.015-0.3mm
Press-down motor: 2.2KW×2
Screw rod: S70×4, press down speed: V=0.05mm/s
Main motor: 15KW
Speed reducer: JZQ650, ratio=23.34, mould=6
Recoiling drum: Φ300×350
Recoiling motor: 8KW

5. Φ480/Φ1150×1380 Stainless Steel Four Roller Reversible Cold Rolling Mill

Material: Stainless steel 201, 304, 430
Input thickness: ≤3.0mm, input width: 1000mm
Finished thickness: 0.20-0.30mm, finished width: 1000mm
Rolling speed: V≤100m/min, rolling pressure: P≤800T
Inner coil diameter: min. 508mm, coil weight: max. 10T
Rolling column section size 420×520mm, material ZG35
Work rollers: work roller diameter × working surface width Φ480×1380㎜, Material 9Cr2Mo, FCD needle bearings
Support rollers: diameter × working surface width Φ1150×1380㎜, Material: Φ1150×1380㎜, FC bearings
Lubricating style: oil mist lubrication
Roller-changing style: hydraulically driven to change rollers
The balance of support rollers is hydraulic controlled
Main motor: Z4 motor, power 1200KW
Main speed reducer: ZLY630
Structure of recoiling block: hydraulic rectangular pyramid Φ508×1380㎜
Main motor: Z4 motor, 450KW
Electric Control System:
590 digital speed adjusting equipment
Mitsubishi PLC system

6. Φ140/Φ190/Φ450×450 Four Stand Four Hi Tandem Cold Rolling Mill

Material: normal carbon steel, high strength special steel
Input: ≤3×360㎜, output:≥0.3×360㎜
Rolling strength: 3000KN
Output rolling speed: 210m/min
1#,2# stand: Φ190×450㎜, drive through work rollers,
3#,4# stand: Φ140×450㎜, drive through backup rollers
Backup rollers: Φ450×450
Main motor: P=355KW 600/1600r/min
Recoiling drum: Φ480- Φ500㎜×450mm
Recoiling power: 110KW
Recoiling force: ≤1500㎏
Eurotherm 590 speed control + PLC

7. Φ225/Φ650×750 Five Stand Four Hi Tandem Cold Rolling Mill

Layout flow: Decoiler---Coil-loading car----2-roller pinch feeder and 5 roller straightener----Shear and TIG welder----Spiral Accumulator----Central aligner----Processing platform----Five-stand Four-Hi Tandem Cold Rolling Mill----Recoiler----Coil discharging car
Other equipments: electric control system, lubrication system, hydraulic system
Material: plain carbon steel
Input: 3.0mm x 650mm
Output: 0.4mm x 650mm
Output rolling speed: 240m/min
Rolling force: 6000KN
Work roller: Φ225 x 750
Backup roller: Φ650 x 680
Z4 series motors for rolling mill and recoiler
Column section size of each stand: 420 x 520mm
Drive through work rollers.

8. Φ380/Φ880×1600 Aluminium Four Hi Irreversible Coil Cold Rolling Mill

Material: aluminium, aluminium alloy
Tensile strength: ≤340
Input thickness and width: max 9mm, 800~1350mm
Input coil specification:
(1) Inner diameter 508mm
(2) Outer diameter: max 1600mm
(3) Max 5T
Finished coils:
(1) Width: 800~1300mm
(2) Thickness: 0.2-0.5mm
Max rolling force: 12000KN
Rolling speed: normally 110m/min, max 240m/min
Work roller: Φ380×1600
Backup roller: Φ880×1550
Motors: Main Mill: 750KW×2, Decoiler: 225KW×2, Recoiler: 225KW×2

Technical Parameters:

Type Φ70/Φ210×250 Φ135/Φ350×350 Φ140/Φ450×450 Φ175/Φ500×550
Work rollers (mm) Φ70 Φ135 Φ140 Φ175
Roller length (mm) 250 250-350 450 500
Rolling force (Tons) 80 120 280 280
Input thickness (mm) 1.5 ≤2.7 ≤3 ≤4
Finished thickness (mm) 0.08 ≥0.15 ≥0.3 0.3
Width (mm) 30-200 ≤250 360 400
Rolling speed (m/min) 180 180 180 210
Main motor (KW) 22 55 75 90
Press-down motor (KW) 2.2 4 6 7.5
Press-down speed (mm/s) 0.06 0.08 0.08 0.08
Speed reducer JZQ650 JZQ850 ZLY450 JZQ1000
Weight (Tons) 8.5 19 22 24
Type Φ190/Φ535×600 Φ180/Φ650×850 Φ205×900/Φ650×850 Φ480/Φ1150×1380
Work roller (mm) Φ190 Φ180 Φ205 Φ480
Roller length (mm) 600 850 850 1380
Input thickness (mm) 3 3 3 3
Output thickness (mm) 0.5 0.4 0.25 0.3
Width (mm) 500 750 800 1000
Rolling force 4000KN 5000KN 5500KN 800T
Rolling speed (m/min) 150 150 210 120
Main motor (KW) 450 630 630 1200
Press-down motor 30 44 44 60
Shanghai Ivy Import & Export Co., Ltd is a professional manufacturer and supplier of 4-Hi cold rolling mill in China. We still have other products: metal cut to length line, including thin coil cut to length line, middle thick coil cut to length line and thick coil leveling cut to length line; roll forming machine like C, Z, U, L purlin forming machine, guardrail, deck, keel forming machine etc; welded pipe making machine like Φ25 high frequency welded pipe production line, HG32 HF welded pipe making machine etc. With good quality and affordable price, our products has been exported to many countries, such as Germany, Holland, India, Indonesia, New Zealand, Syria, United Arab Emirates, Russia, Kuwait, South Africa, and Bangladesh.