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14 November 2023, 12:17

Water quenching & tempering line

Amir Hossein Nematkhah
Wrote by
Amir Hossein Nematkhah
Water quenching & tempering line

 

 

Location    Components
Downstream the rolling mill finishing stands.
  1. Water quenching line
  2. Waterbox
  3. Waterbox by-pass roller table
  4. Valve bench
Dute

In-line quenching and self-tempering of deformed bars.

 

 
 


 

A- Water quenching line

The water quenching line includes:

- Two (2) water boxes (waterbox A and B) each one consisting of:

  •  a fabricated steel structure where the cooling elements (coolers, water strippers, air dryer, by-pass pipes) are

          fixed to the frame on machined support/delivery pipe arrangements for a perfect alignment. Quick

          locking/unlocking by hand wheel;

  • water system with external main pipe and delivery pipes to each cooling element;
  • ON-OFF valve for each cooling element;
  • water sprayers inside the box to externally cool the by-pass pipes;
  • protection cover.

- A roller table to convey the bar to the downstream services when the in-line treatment is not required. Included in

   a separate item.

- A shifting car designed to support and shift the waterboxes and the roller table into working position in accordance

  with the product being rolled. It consists of a welded steel frame mounted on idle wheels running on foundation

  rails; shifting movement by hydraulic cylinders. Maintenance platforms along the waterboxes.

 


B- Waterbox

Each water box of the water cooling line includes:

A water box consisting of:

  •  a fabricated steel structure where the cooling elements (coolers, water strippers, air dryer, by-pass pipes) arefixed to the frame on machined support/delivery pipe arrangements for perfect alignment.
  • Quick locking/unlocking by hand wheel.
  • water system with external main pipe and delivery pipes to each cooling element.
  • ON-OFF valve for each cooling element.
  • water sprayers inside the box to externally cool the by-pass pipes.
  • protection cover with opening/closing by hydraulic element.



 


C- Waterbox by-pass roller table

Installed on waterbox side, on the shifting car.

Consisting of:

  • Fabricated steel frame with covers between rollers.
  • Independently driven rollers mounted on double supports with roller bearings..

 


D- Valve bench

The valve bench is a welded steel structure housing all the components necessary to control water flowrate, such as:

  • flow control valve(s)
  • electropneumatic converter(s)
  • magnetic flow meter(s)
  • pressure regulator(s)
  • pressure gauge(s)
  • pressure transmitter(s)
  • miscellaneous valves (ball valve, butterfly valve, etc).

The valves are controlled by a PLC to obtain a given flowrate according to the temperature set for the cooling process.



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