ISSN 2594-5297
54º Seminário de Laminação e Conformação — vol. 54, num.54 (2017)
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Weight reduction is the main target of all carmakers, which results in a continuous development of new steel grades. Latest 3rdgeneration advanced high-strength steel grades (AHSS) are complex materials with special chemical compositions and multiphase microstructures. The pickling, annealing and galvanizing processes of these grades aresomewhatdifferent due to the changed chemical compositions and microstructures. Therefore, these innovative steel grades place new demands on the plant technology of pickling, annealing and galvanizing lines. The most significant challenges for the pickling process are sludge occurrence during pickling, varying pickling times, weld ability of the materials, changed visual appearance and required high surface qualities. The most important topic concerning annealing line is a precisely controlled and very flexible heating and cooling process in the furnace.One of the new requirements in galvanizing linesis the prevention of surface faults caused by bare spots, which can occur since these materials feature a higher content of alloying elements like silicon or manganese. Prevention is possible with the special pre-oxidation technologies.Due to the higher strength of the material also the mechanical equipment has to be designed differently in these lines. This paper describes the influences of the changed chemical composition and material characteristics of modern steel grades on the pickling, annealing and galvanizing process and gives an overview about the technical solutions.
Palavras-chave
Pickling, Annealing, Galvanizing, High-strength steel grades
High-strength steel grades
Como citar
Morganti, Francisco;
Brühl, Fritz;
Sasse, Caesar.
INFLUENCES OF MODERN AHSS-GRADES ON THE PICKLING, ANNEALING AND GALVANIZING PROCESS
,
p. 40-51.
In: 54º Seminário de Laminação e Conformação,
São Paulo,
2017.
ISSN: 2594-5297
, DOI 10.5151/1983-4764-30151
