Coil to coil Normalising Line, silicon steel processing lines, coil cars, multi-roll straightener
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Case Study - III

Raymond Steel Ltd  -  Coil to coil Normalising Line

Background

Raymond Steel Steel was established as a part of the group's diversification plans to manufacture world class special steels. The plant located near Nashik in Maharashtra, has an installed capacity of 200,000 tons per per annum, consisting 30,000 Mt of high quality cold rolled grain oriented silicon steel and 135,000 tons of CRCA coil/sheets. Raymond Steel has a technical collaboration with Allegheny Teledyne Incorporated of USA, world leaders in the manufacture of specialty steels. They were looking for a silicon steel processing line - manufacturer who could supply them with a Coil to coil Normalising line which would impart the  desired grain refinement, mechanical properties and bright surface finish to the CRGO coils. The Normalising furnace process design was based on Allegeny Teledyne technology. 

CASE STUDY
Tata Ryerson Roll Forming Line
Tata Steel Coil Dividing Line
Raymond Steel Normalising Line

The Challenge

Raymond Steel has developed the entire spectrum of International quality silicon steel to meet most of the electrical machinery requirements. The CRGO steel is characterized by lower than guaranteed core losses, superior magnetic induction and excellent electrical properties. The steel will be utilised depending on grade in several applications ranging from FHP motors to turbo generators and hydro generators.

The Solution

Dassnagar bagged the contract by competing with a galaxy of renowned silicon steel processing line manufacturers, by offering a Coil to Coil Normalising line with an annual productivity of 30,000 tpa. The 105 meter long line encompasses sophisticated equipment in the form of dual pay off  uncoiler reels, pinch roll, five roll straightener, double row stitcher, entry and exit bridle roll tensioner, swivel type steering roll units (to guide strip vertically), horizontal strip accumulator in the form of a looper car, re-circulating air and spray quench system, sludge separator, drier, shot blasting unit, rewind reel (recoiler), entry and exit coil cars for transportation of coils.

Benefits

  • achieved productivity > 35,000 tpa, @line speed 20 mpm,
  • normalising quality within tolerance limits set by Allegeny Ludlum
  • entry and exit bridle roll units maintain proper strip tension - no sagging inside furnacel,
  • swivel type steering roll unit maintains precise vertical strip alignment  - horizontal looper car runs at constant speed preventing strip burning inside furnace,
  • shot blasting- scale removal quality - excellent,
  • 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,
  • dual uncoiler (pay of reel) ensures non-stop line operation,
  • auto tail out function ensures that the coil is processed till the last end,
  • precise strip tension measurement and control sag thru PLC control unit,

Conclusion

The Normalising Line was successfully commissioned in June 2002 with an achieved productivity of 35,000 tpa.

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