Carbon Steel 4-Hi Skin Pass Mill ( leveling machine, skin pass mill, temper rolling)

It is used for leveling the annealed cold rolling strips in order to enhance the surface hardness,strength.

1. Technical Code 

² Specification : Cold rolling steel after cold rolling and annealing

² Raw material: CS, high-quality steel, low-alloy steel

² Standard No.: SPCC, SPCD, ST-12, Q235, Q345, 20#

² Material performance: σs=360N/mm

² Thickness: 0.20~1.5mm

² Width: 800~1250mm

² Coil ID: Φ508mm

² Coil OD: Φ900~Φ2000mm

² Max. Weight: 25t 

² Coil Weight Standard: 19.25kg/mm(max.)

   Finish Products: 

² Thickness: 0.520~1.5mm

² Width: 800~1250mm

² Coil ID: Φ508mm

² Coil OD: Φ900~Φ2000mm

² Max. Weight: 25t

² Coil Weight Standard: 19.25kn/mm(max.)

² Elongation: dry leveling 0.3~3%  wet leveling 0.5~10%

² Finish precision(refer to National Cold Rolling Quality Standard)

   Standards of elongation performance: 

² Elongation of dry leveling: 0.3~3%  Max. absolute deviation≤±5%

² Elongation of wet leveling: 0.5~10% Max. absolute deviation≤±3%

2. Main technical parameter

² Max. rolling pressure: 7000KN 

² Pre-designing max. rolling speed: 360m/min

² Threading speed: 30m/min

² Uncoiling tension: 3.2~32KN

² Coiling tension:5.3~53KN 

² Size of work roll: Φ420/Φ380*1450mm

² Size of supporting roll: Φ800/Φ740*1450mm

² Diameter of drum of pay off reel: Φ508mm

² Diameter of drum of coil: Φ508mm

3. Loading standard and performance:

² DC speed regulation

² Hydraulic press-down roller, pressure, APC auto-control

² Work roll positive bending roll control 

² The line tension and elongation auto-control

² Pay off reel CPC auto-centering

² Speed auto-control according to the rolling code

² Two kinds of leveling process: dry/wet leveling

² The electric antomatization is adopted PLC control (S7-400series).

² The line has the function of auto-accelerating/decelerating, broken strip protection, over-loading protection, fault alarm and auto-stopping.

² HMI function

² Under work roll drives singly

Carbon Steel 4-Hi Skin Pass Mill ( leveling machine, skin pass mill, temper rolling)