Internal quality improvement of slabs from caster 3, SMS II RSP with soft reduction technology

There’s a little bit of SAIL in everybody’s life

SMS-II (Equipments)3 LD Converters3. Ladle heating furnaces. RHOB to be commissioned in near future

3 Conventional Slab CasterCaster-1 & 2 commissioned in 1996, Mansmann Demag makeCaster-3 commissioned in 2013, SMS Siemag Make

There’s a little bit of SAIL in everybody’s life

ROURKELA STEEL PLANT

Advanced facilities in Caster-3 :1. Dynamic Solidification Control2. Soft Reduction3. Online width change4. Hydraulic mould oscillation5. Hydraulic Segment Adjuster6. Online sub entry nozzle change

In continuous casting of semis like slabs blooms center segregation and centre porosity are prevalent.

Due to volume contraction associated with the solidification process of liquid steel the shrinkage cavity is produced at the crater of final solidification region.

The appearance and intensity of center segregation and porosity are normally closely related to steel grade, superheat, casting speed & cooling history.

There’s a little bit of SAIL in everybody’s life

Soft reduction technology is used to compensate the

solidification shrinkage

In this process roll gap is reduced by a calculated

amount in the mushy zone. The compression

produced by the soft reduction enables the

condensed liquid steel to flow in the reverse

direction of casting & also prevents inter dendritic

flow in the transverse direction which may lead to

redistribution of solute elements in the liquid steel

Online soft reduction is used along with DSC model

which accurately predict the mushy zone.

There’s a little bit of SAIL in everybody’s life

There’s a little bit of SAIL in everybody’s life

There’s a little bit of SAIL in everybody’s life

The use of soft reduction technology has improved the acceptability of the slabs for

producing high strength steel with qualified mechanical properties.

The center porosity and center segregation has improved to Mannesmann standard 1 in most of the cases.

There’s a little bit of SAIL in everybody’s life

no soft reduction

There’s a little bit of SAIL in everybody’s life

with soft reduction

There’s a little bit of SAIL in everybody’s life

Thank you

There’s a little bit of SAIL in everybody’s life