Project Name: 1450mm Push-Pull Pickling Production Line
Customer name: Tianjin Xinyu Color Plate Co., Ltd
Project nature: new construction
Undertaking method: Jingjie Ruisi general contracting
Signing time: February 21, 2010
Production: Under construction
Progress: Good
1. Basic parameters:
Material: CQ, DQ, DDQ, HSLA
Tensile strength: Max.550N/mm2
Yield strength: Max.340N/mm2
Raw material volume: 1 million tons/year hot-rolled coil
Strip thickness: 2.0~4.5 mm
Strip width: 800~1280mm
Inner diameter of steel coil: 762/610
Outer diameter of steel coil: Max. 2000mm
Min. 1100mm
Steel coil weight: Max.28t
Raw material requirements
Thickness tolerance: 5% of the rated tolerance range of the strip
Width tolerance: The width tolerance of the whole roll is 0/10mm
Straightness: 220-I units
Convexity: 50m
Tower shape: the whole roll is less than 50mm
The interlayer between layers is less than 10mm
Sickle bend: No more than 4mm for every 2000mm in length
Other requirements: The incoming material should not have corner cracks, cracks and upward bends of 90? The surface of hot-rolled strip steel should not have spots, impurities, dry oil and paint brought out during rolling.
Annual output: 1 million tons/year hot-rolled pickling coil
Product Specifications:
Strip thickness: 1.8~4.5mm
Strip width: 800~1280mm
Inner diameter of steel coil: 610
Outer diameter of steel coil: 2000mm
Coil weight: Max. 28t
Main technical parameters of the unit
Entrance segment
Inlet section speed: Max. 180m/min
Strapping speed: Max. 100 m/min
Uncoiler tension: Max. 2t
Process section
Pickling process speed: Max. 180m/min
Strapping speed: Max. 100m/min
Outlet section (trimming section)
Exit Section Speed: Max. 180m/min
Strapping speed: Max. 100m/min
Tension of ****** reeling: 6t
Pickling data
Number of pickling tanks: 6 pcs
Pickling tank length: 13.5m
Number of rinsing sections: 5 sections
Pickling medium hydrochloric acid
The acid concentration was 190~210 gHCl/L, with an average of 200 gHCl/L
Pickling temperature 75-85°C
Rinse the medium condensate / demineralized water
The concentration of iron ions in waste acid was 110~130 g/L, with an average of 120 g/L
Pickling iron loss 0.4~0.45 % (Fe, estimated)
2. This pickling unit has the following characteristics
1. The design of pickling unit (including design, manufacturing, supply, installation, commissioning and service) refers to foreign advanced technology.
2. The inlet feeding adopts double uncoiling, saving the feeding auxiliary time.
3. The entrance of the acid tank is equipped with a nine-roller straightening machine to ensure the ****** plate type through the belt.
4. There is a gas preheating equipment in front of the pickling tank, which improves the pickling efficiency and saves energy.
5. Adopt advancedThe pickling process - shallow tank turbulent flow pickling, short pickling time, high pickling efficiency. 6. It adopts 5-stage string countercurrent rinsing process, which has low water consumption and good cleaning effect. 7. Use gas hot air and water steam drying to save energy. 8. The outlet is equipped with portal disc shears, and the double tool holder configuration greatly reduces the time of replacing the shear blade and improves the operation rate. 9. In order to ensure that the strip is cut in the middle when entering the trimming disc shear, a CPC correction device is set up before the trimming disc shear to finely correct the strip to ensure the trimming accuracy of the strip. 10. There is an electrostatic oiling machine at the outlet to ensure the thickness and uniformity of the oil film on the surface of the strip, save fuel consumption, and ensure the oiling quality of the takeaway hot-rolled pickling board. 11. The outlet adopts the form of single winding, and the winding machine is equipped with an EPC edge centering device, which can automatically float and center according to the detection of the edge of the strip to achieve high-quality winding effect.