Modifikace zařízení pro kontinuální lití z geometrie čtvercové na kruhovou

MODIFICATION OF BILLET CONTINUOUS CASTING MACHINE FROM SQUARE TO ROUND GEOMETRY

článek ve sborníku ve WoS nebo Scopus

en

Start up of a six strands billet continuous casting machine with open casting technology was launched in 1999. The machine is used in ArcelorMittal Ostrava plc. for casting of billets with a square section of 115 and 160 mm. This caster can produce small slabs as well. First, trial production of the billets with round section (130 mm) was set on the 1st December 2006. The billets of diameter 130 mm are used for the production of seamless pipes. There is no information that this small section of diameter 130 mm is produced on conventional casters. The modification required, among others, expects to re-design the secondary cooling section. A test bench for the study and optimization of spray cooling at round geometry was built at the Heat Transfer and Fluid Flow Laboratory. The paper describes the process of secondary cooling optimization with help of heat transfer measurements and numerical modelling. The secondary cooling headers use water full cone nozzles and the cooling intensity is controlled by setting pressure. The heat transfer tests of nozzles provide a distribution of cooling intensity, described by heat fluxes and heat transfer coefficient, around the cooled body. Particular results from the view of solution and implementation in steel plant conditions are described. The paper gives a description of plant experience obtained from trial casting.

Požadovaná modifikace, mimo jiné předpokládá nový návrh sekundárního kontinuálního lití. V laboratoři přenosu tepla a a proudění byla postavena testovací lavice s kruhovou geometrií pro studium a optimalizaci chlazení. Článek popisuje proces optimalizace sekundárního chlazení za pomoci měření přenosu tepla a numerického modelování.

Start up of a six strands billet continuous casting machine with open casting technology was launched in 1999. The machine is used in ArcelorMittal Ostrava plc. for casting of billets with a square section of 115 and 160 mm. This caster can produce small slabs as well. First, trial production of the billets with round section (130 mm) was set on the 1st December 2006. The billets of diameter 130 mm are used for the production of seamless pipes. There is no information that this small section of diameter 130 mm is produced on conventional casters. The modification required, among others, expects to re-design the secondary cooling section. A test bench for the study and optimization of spray cooling at round geometry was built at the Heat Transfer and Fluid Flow Laboratory. The paper describes the process of secondary cooling optimization with help of heat transfer measurements and numerical modelling. The secondary cooling headers use water full cone nozzles and the cooling intensity is controlled by setting pressure. The heat transfer tests of nozzles provide a distribution of cooling intensity, described by heat fluxes and heat transfer coefficient, around the cooled body. Particular results from the view of solution and implementation in steel plant conditions are described. The paper gives a description of plant experience obtained from trial casting.

kontinuální lití, přenos tepla , HTC, sekundární chlazení, tryska, experiment

continuous casting, billet, heat transfer, heat flux, HTC, secondary cooling, nozzle, experiment

2008

03.06.2008

associazione Italiana di Metallurgia

Milano

88-85298-65-6

6th European Conference on Continuous Casting

1–10

10