ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
Up to now, no technology exists for producing as-cast thixotropic steel at the industrialor pilot level. The existing processes need to reheat a billet that has been previously cast andwrought on separate equipment. The new processing route, we are developing, will allow producingas-cast steel (or high melting point alloy) with thixotropic properties.CRM has developed and patented a continuous casting technology, which by using a speciallydesigned nozzle (HJN nozzle-hollow jet nozzle), allows to combine powder injection and a lowsuperheat. It has been proven by pilot and industrial trials that the combination of iron powderinjection and a low superheat leads to achieve a globular solidification structure in the core of acontinuously cast steel billet. Several industrial trials on continuous caster have been carried outboth with carbon and stainless steel but also on copper in order to modify the solidification structureof these materials.The application of this HJN technology is being studied in order to achieve a globular structure onas-cast steel with the objective to obtain a thixotropic behaviour of the material after an adequatereheating. Casting trials have been performed on CRM continuous casting pilot-line. Specificallydesigned equipment has been built for use in a steel foundry. The influence of the solidification rate,the superheat, the amount and the composition of the powder has been studied
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.141-143.415.pdf
Permalink
