• METALS products
  • Stainless steel: pickling
  • Hot annealing and pickling lines

Annealing and pickling lines for hot-rolled stainless steel strip

ANDRITZ provides customized annealing and pickling lines for the entire range of stainless steel strip dimensions.

ANDRITZ METALS supplies custom-tailored hot annealing and pickling lines (HAPL) with or without inline equipment, such as rolling mills (so called DRAP or WRAP lines).


Annealing furnace of a cold annealing and pickling line

Product description

  • Hot annealing pickling line:
  • Processing of stainless steel from a tandem or Steckel hot rolling mill.
  • Thermal processing to achieve uniform metallurgical structure and subsequent surface treatment (shot blasting and pickling) prior to cold rolling.
  • White rolling, annealing, and pickling (WRAP) line:
  • Tandem rolling of pickled hot-rolled strip, followed by annealing and pickling to produce final cold-rolled and annealed strip in one line.
  • Direct rolling, annealing, and pickling (DRAP) line:
  • Hot APL with direct inline rolling prior to annealing in order to produce thinner products with cold-rolled tolerances in gauge.

Mill section of a rolling, annealing, and pickling line (RAPL)

Strengths and benefits

  • DRAP and WRAP: combination of process steps, less equipment, less inventory, and fewer personnel
  • All machines required are made entirely by ANDRITZ
  • ANDRITZ is market leader in this field
  • Many references all over the world
  • Technological know-how, especially for greenfield producers
  • Combination of pickling and acid regeneration, acid management for several lines
  • Effluent-free lines, heat recovery from furnace

Suitable E&A models

Mathematical model for all processes (annealing, pickling, etc.)

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