02 SECONDARY REFINING

Purifying Excellence:
The Secondary Refining Phase in Steel Manufacturing
VACUUM DEGASSING (V.D.)
  • Vacuum Degassing unit – Mechanical Pumping System supplied by M/s. Edward Mech. Pumps, U.K.
  • Can achieve 1m bar in 6 minutes & capable of achieving as low as 0.30 m bar.
  • Help us with the production of lower gas content & cleaner steel.
35 Ton Ladle Refining Furnance (LRF)
  • Equipped with Automatic Ferro Alloy Feeding system
Cored Wire Feeding
  • Cored Wire feeding at VD station helps in fine adjustment of “Ca” and in modification of inclusions & “S” content control as per customer requirement.
  • It also facilitates the deep injection of additives into the steel without excessive ingress of air/oxygen.

STEPS TAKEN TO IMPROVE CLEANLINESS OF STEEL

  • Controls Tapping oxygen from EAF & measured soluble oxygen with the help of celox instrument.
  • Sulphur content after desulphurization is < 0.010%
  • We keep VD lifting Aluminum content < 0.030%
  • Mild Purging after each wire addition ‘CaSi’ and ‘S’ is minimum of 5 minutes, so that proper flotation of inclusions up into the slag.
  • For sequence heats Tundish level is being maintained at approx. 3 MT minimum.
  • Vesuvius Turbo Stop used in the Tundish during casting.
  • EMS (Electromagnetic Stirrer) is being used in CCM.
  • Hydraulic mold oscillator installation which helps us to improve the cleanliness of steel.
  • Higher reduction ratio, Rolling of 50 mm diameter from 320 X 250 mm billet size.
  • The first and last billets/ tundish material is not being rolled for critical grades/applications.