Dassnagar manufactures world class coil to coil annealing lines for processing of flat rolled silicon steel, CRGO
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Coil to Coil Annealing Line

Overview

Silicon steel (CRGO) coils are hard and brittle with elongated grain structure. For desired grain refinement, mechanical properties and bright surface finish, they are processed in a protective atmosphere in direct oil fired Continuous Annealing (Normalising)  furnaces.

Classification

They are categorized into two types :

  • Bell Annealing Furnace
  • Coil to Coil Annealing Line
CASE STUDY
Tata Ryerson Continuous Roll Forming Line
Tata Steel Coil Dividing Line
Raymond Steel Normalising Line

Offerings

Dassnagar make Annealing lines are of the coil to coil variety encompassing sophisticated equipment in the form of dual pay off reels, straightener, stitcher, direct oil fired annealing furnace with recuperator, looper car, re-circulating spray quench system, sludge separator, drier, shot blasting unit, rewind reel, coil car for transportation of coils and coil storage.

The annealing furnace section encompasses sophisticated automation designed in collaboration with Pittsburgh based Allegheny Ludlum corporation. Annealing process details are available in the collaborators website.

 

Salient Features

  • wide processing range 1.8 mm to 2.5 mm
  • achieved productivity > 36,000 tpa, line speed 20 mpm,
  • roll design and roll crown system - specially calculated for each furnace for ultimate control and durability.
  • entry and exit bridle roll units maintain proper strip tension inside furnace section - no sag at all,
  • swivel type steering roll unit for strip guiding - horizontal looper car for strip accumulation to prevent strip burning inside furnace,
  • shot blasting unit for removal of oxide scales,
  • strip lead & tail end joining - double row strip stitcher,
  • direct heat recovery from the strip, reduced risk of oxidation, thermal shock, -  improved furnace transient performance,
  • squeezer roll assembly after rinsing section squeezes water from strip surfaces,
  • re-circulating spray quench system with sludge separator,
  • dual uncoiler (pay of reel) ensures non-stop line RUN during coil change,
  • auto tail out function ensures that the coil is processed till the last end,
  • precise strip tension measurement and control sag thru PLC,
  • in house manufacturing of all equipment to maintain quality,
  • servicing within 48 hrs in any corner of the world,
  • readily shippable spare parts
line specification  |  equipment list
Process Lines - For Sale
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