characterization of a covering powder used in continuous casting

‫اﻟﺠﻤﻬﻮرﻳﺔ اﻟﺠﺰاﺋﺮﻳﺔ اﻟﺪﻳﻤﻘﺮاﻃﻴﺔ اﻟﺸﻌﺒﻴﺔ‬
REPUBLIQUE ALGERIENNE DEMOCRATIQUE ET POPULAIRE
‫وزارة اﻟﺘﻌﻠﻴﻢ اﻟﻌﺎﻟﻲ و اﻟﺒﺤﺚ اﻟﻌﻠﻤﻲ‬
MINISTERE DE L’ENSEIGNEMENT SUPERIEUR ET DE LA RECHERCHE SCIENTIFIQUE
Université Hadj Lakhdar
Batna
Centre de Recherche Scientifique et Technique en Soudage et Contrôle.
CSC, BP 64 Chéraga, Alger. Tél. /Fax 021 37 18 21
Université Saad Dahlab
Blida
CHARACTERIZATION OF A COVERING POWDER USED IN
CONTINUOUS CASTING
A.Hamouda1*, H. Meradi1, A. Balaska1 and S. Bouhouche1
Iron and Steel Applied Reseach Unit-Welding and Control Center, URASM-CSC,
BP 196 Annaba 23000 Algeria
*
E-mail : [email protected]
1
Abstract :
Continuous casting of steel is a process in which liquid steel is continuously solidified into a
strand of metal. The components of the continuous casting steel system are the ladle, tundish
and ingots. Covering powders are spread on the surface of the bath of the molten metal of the
ladle and tundish, in order to avoid reoxydation, reduce heat loss near the surface, assimilate
any non-metallic material and lubrification for isolation of the ingot from the mould. These
powders are silica based materials in order to control fusion rate and viscosity.
The aim of this work is to study the behavior of a covering powder made of algerian variety
of raw materials (such as diatomite). The diatomite is rich of amorphous silica which is
considered to be low toxicity, crystalline silica and specially quartz is highly toxic. The
morphological, thermal and structural studies were followed by electron scanning microscopy
(MEB), differential scanning calorimetry (DSC/ATG) and X-ray diffraction (XRD) using the
MAUD program based on the Rietveld method combined with a Fourier analysis in order to
describe quantitative analysis of amorphous phases.
Key-words: continuous casting, covering powder, XRD, diatomite.
Conférence Internationale sur le Soudage, le CND et l’Industrie des Métaux, IC-WNDT-MI’10
Oran, 28 - 30 novembre 2010. Site web : http://www.csc.dz/wcndt-10