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Strength forming of steel has significant advantages and could be an asset in the inter-material competition if it were more widely used than deep drawing in Europe. The present research reported here has shown that for the dent resistance it is only from a certain deformation level that deep drawing becomes more favourable than stretching. That means that deep drawing is the most appropriate deformation path for a deformation level higher than 10%. In the majority of car body stamped parts for which the dent resistance is a major specification and where the deformations are lower than 6%, interesting potentialities for stretching appear. The evolution of the roughness is more progressive in stretching than in deep drawing with the result that a moderated roughness can be secured in a deformation range less than 10%, corresponding to the external parts. Powdering affecting the quality of galvannealed steel sheets during the drawing is lower in stretching than in deep drawing, the ratio being 1 to 5.

Additional information

Authors: DEFOURNY J, Centre de Recherches Métallurgiques, Liège (BE);FOURNEAUX P, Centre de Recherches Métallurgiques, Liège (BE);MONFORT G, Centre de Recherches Métallurgiques, Liège (BE)
Bibliographic Reference: EUR 15472 FR (1996) 53pp., FS, ECU 8.50
Availability: Available from the (2)
ISBN: ISBN 92-827-6181-9
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