Push pull pickling lines

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Push pull pickling line

As car manufacturers continue to seek increasingly lightweight, high-strength steel products, the pickling process has become challenging due to the oxides produced by the alloying metals. The robust and efficient design of Fives' push pull pickling line ensures superior oxide removal from hot rolled coils. Particularly suited to lines processing changing strip width or thickness, the benefits of a push pull line include:

  • Granite tank protection
  • High turbulence acid circulation
  • Wide range of product thickness (1– 16mm)
  • Advanced chemical control for low consumption and low effluents
  • Efficient rinsing and drying
Turbulent pickling tanks

High efficiency turbulent pickling tanks

To further increase pickling efficiency, the pickling tanks are designed with a highly turbulent circulation system. While non-turbulent pickling systems experience decreasing pickling efficiency along the length of the tank, turbulent pickling tanks utilise acid injection from both sides to ensure aggressive turbulence throughout the strip.

Hot acid is injected directly at the strip edge, perpendicular to the direction of strip travel, ensuring a turbulent flow pattern is established. 

Advantages:

  • Elimination of pickling ‘dead zones’
  • Increased efficiency results in reduced pickling time, especially when combined with scale breaking
  • Low acid consumption as result of low over-pickling; low accumulation of sludge
  • Uniform heat distribution over tank length, regardless of line speed
  • Side injection across strip edge, notably the most difficult area to pickle

This translates to reduced acid recovery costs, reduced and simplified maintenance, and precise control over the pickling process for a better quality end product. The system is controlled from the operator desk, where temperatures are monitored, stored and can be adjusted in accordance with operational requirements. When the pickling line stops, the pickling fluid automatically drains into the circulation tank. Bypass heating is carried out automatically for fast line restart. Pickling solution is added to the last pickling tank and cascades to the first pickling tank where an equal quantity of pickle liquor is drawn off to ensure a consistent acid concentration.

Push pull pickling line advanced design for AHSS

Fives utilizes advanced 3D modeling and stress analysis to ensure superior quality equipment design. The push pull pickling line includes a range of benefits as standard, including:

  • Spray bar design allows for bar removal while line is running; spray bars can be changed quickly
  • The efficient and effective counter flow cascade uses less water
  • The control system continuously monitors water quality and the amount of water used
  • The use of condensate eliminates the need for demineralized water
  • The easy-maintenance external circulation tank has a larger circulation volume for pump protection

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