Sahaviriya Steel Industries PLC

Process & Facilities

Push Pull Pickling Line (PPPC)

push pull pickling line

Hot Rolled Coid

Thickness 1.20 - 6.50 mm
Width 600 - 1,650 mm
Inner Diameter 760 / 610 mm

 


Pay off Reel, Flattener, and Entry Crop Shear

Before processing through pickling and oiling line, hot-rolled coil is unwraped, its surfaces are improved until smooth, and its head end is then sheared off.

Stitcher and Notcher

For processing through tension section, the stitcher welds the steel strip of one coil to the coil following it. The strip's edge is sheared in a concave pattern. Coiled steel of over 4 mm in thickness cannot be stitched or notched, and thus must be processed one coil at a time.

Tension Leveler

Steel strip with a thickness of 1.20- 4.00 mm must be smoothed out with a tension leveler before pickling. Steel strip with a thickness of 4 mm or more is conveyed directly into the pickling process.

 

Pickling Tank

Smooth steel strip is covered with a film of oxides. This deposit of rust is removed by means of hydrochloric acid in four different tanks, each with its own specific strength. The first tank has the weakest solution, and the last is the most powerful. In each tank is a squeegee roll, which prevents the acid from following along with the steel strip as it moves through. Used acid is treated and recycled in an acid regeneration plant. The fumes from the acid, meanwhile, are absorbed by water in a scrubber. The air emerging from this process is, therefore, free of acid vapour.

 

Rinsing Tank

The steel strip that emerges from pickling is washed in five different rinsing tanks. The water from the fifth tank is sent back to be used in the first tank, and is later treated and recycled.

 

Air Dryer

The steel strip is then dried in blasts of hot air until no moisture adheres to it, thus preventing a recurrence of rust.

 

Side Trimmer and Inspection Station

The side trimmer ensures that the steel strip is of the exact width desired by the customer. The upper and lower sides of the strip are then inspected for quality.

 

Electrostatic Oiler

Having been rinsed, trimmed, and inspected, the steel strip is then oiled to guard against corrosion. A film of oil with a negative charge is sprayed over the steel, which has a positive charge. This electrostatic method ensures firm adhesion of the oil and a complete, consistent coating of the steel's surface.

 

Exit Crop Shear and Exit Mandrel

The steel strip is finally cut, wound into a coil, fitted with a strap, weighed, and given an attractive wrapping before delivery to the customer.

 

Hot Rolled Coil Pickled and Oiled

Inner Diameter 508 / 610 mm
Outer Diameter 915 - 2,150 mm

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