160 m/min galvanizing unit

Project name: 160 m/min galvanizing unit

Customer name: shandong east ding steel rolling co., LTD

The nature of the project: new project

Undertake: Beijing JieRui general contracting

A time: on May 10, 2012

Production: under construction

Operation: good

一、 annual production capacity

Annealing reduction furnace production capacity according to 0.35 x1000mm, 160 m/min, production unit maximum hours of 26 t/h, unit general labor hours for the whole year 7200 h, sets the maximum annual production capacity of 200000 tons.

Second, the raw material and product data

The raw material

Raw material status: cold-rolled hard steel coil

The steel grade, Q195, Q235, (SPCC), SPCD

The strip thickness: 0.15 ~ 0.8 mm

Strip width: 800 ~ 1250 mm

Coil diameter: / phi phi 508 mm to 610 mm

: coil diameter from 1100 mm to 1100 mm

Coil weight: 25 largest t

Mechanical properties: yield strength: б = Max 710 n/s was

The finished product

The strip thickness: 0.15 ~ 0.8 mm

Strip width: 800 ~ 1250 mm

Coil diameter: / phi phi 508 mm to 610 mm

Coil diameter: maximum phi 1800 mm

Coil weight: 20 biggest t

State of the coating

Product surface condition: the ordinary zinc or zinc finishing

The coating weight: 40 ~ 200 g/m2

Coating protection: passivation

Execution standard: GB/T2518-2008

Three, the production process is briefly

From cold rolling workshop of steel coils by workshop crane on the lead across the car, which is then sent to coil galvanized unit entrance, crane steel coil respectively to No. L or N02 steel coil car. Cut steel coil bundle band, the skip on the coil to uncoiler shrinking core shaft, the car fell back in situ, uncoiling machine core shaft open brace steel coil, uncoiler roller pressure, pressure steel coil. Reverse rotation uncoiling machine, to take the lead on top. Positive point decoiler and decoiler roller, will lead to the pinch roll after the uncoiler, lift the uncoiler roller, pinch roll under pressure. Point move decoiler and pinch roll at the same time, continue to take the lead to the entrance in the shearing machine cut lead the super thick and irregular parts, and then continue to take the lead to wait before welding machine. Entry section two uncoiling machine, two pinch roll and two scissors, a set of production process equipment normal operation, another group is in the ready state. When an open book on the coil after the operation, the coil with tail with a new uncoiling machine volume take the lead in welding.

After welding of steel tension roll pass into the entry loop, so the strip into the degreasing speed stability, is advantageous to the degreasing cleaning stability. After the strip out of the entrance loop tension roll into the degreasing, spray after alkali washing, alkali scrub and electrolytic degreasing to remove surface dirt and grease, repass first-class water scrubbing and spray water washing to remove surface residual alkali liquor, to obtain a clean surface of the steel base. After cleaning of steel strip, after drying the rectifying roller, roller into the tension roller and test strip under the zhongheng tension into reducing annealing furnace.

Steel strip inside the furnace is heated to the annealing temperature, and oxide film on the surface of the strip in the furnace is embedded under the action of hydrogen atmosphere be restored. And then the temperature needed for galvanized steel strip after rapid cooling, the thermal tension roll into the ceramic pot. In pot with internal dip, and then after sink roll to the vertical ascend, galvanized strip steel. After leaving the liquid level in zinc pot strip above the two sides of a pair of air knife will scrape the surface excess plating solution, plating thickness control implementation.

Steel strip after chi dao, continue up to ascend into cooling period after plating coating solidified, then through turning into levels continue to cooling fan, then turned to straight down, again into the quenched groove, before entering the quenching tank, strip cooled to below 160 ℃, with temperature drop after quenched groove water-cooled below 45 ℃, after drying into the finishing area correction, the steel strip with tension roll group into the machine, the machine's main function is to improve the light steel with the mechanical properties and flatten zinc, steel belt is approved by the tension roll group into the tensile machine stretching to improve the strip shape.

After correction of steel belt, passivation treatment, passivation treatment using dip-coating squeezed dry. Steel plate after passivation into drying device. The tension roll into the export looping.

Unit set up the entry loop and export loop ensures that the unit running process, parking, entry and exit section roll process segment can still maintain normal operation.