Development of a New Sub-Entry Nozzle for Casting Narrow Section in CSP® at BPSL India
(Room 410)
16 May 16
10:30 AM
-
11:00 AM
Tracks:
Tundish to Mold Refractories
To produce seamless steel pipe for 300mm, narrow slabs are being cast in 800mm wide CSP® funnel mold in Bhushan Power and Steel Limited. To reduce refractory cost per ton in this highly competitive market, long casting sequence must be achieved while maintaining high quality standards.
A new refractory Sub-Entry-Nozzle or SEN has been developed with the challenging objectives of long sequence casting and high quality standards for the rolled products.
To achieve these goals, the mold flow behavior, particularly in the meniscus region, has to remain stable regardless of the large nozzle immersion range.
Numerical simulations were conducted with the objectives of achieving improved mold flow stability and better mold powder melting in these small mold cavities inside which the SEN is located.
The new SEN design, R3SB is used to cast regularly over 40 heats with mold level fluctuations remaining below 2mm range. Obviously the installation and the utilization of the SEN by experienced BPSL personnel have been optimized to achieve these long casting sequences.
High erosion resistance zirconia slag line sleeve and high performance refractory materials have been successfully implemented, extending the casting sequence length to reduce the overall refractory cost per ton allowing BPSL to remain competitive in this price sensitive markets.