Juan Manuel Salgado-Lopez
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José Luis Ojeda-Elizarrarás
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José Trinidad Pérez-Quiroz
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Hector Javier Vergara-Hernández
This work shows the influence of the normal anisotropy
(“r” value) in the deep drawing of AISI 439 ferritic
stainless steel sheets. In order to do so, quantitative
chemical analysis, metallographic analysis, tensile
mechanical properties, and the determination of the “r”
value and the “n” value were carried out in two different
AISI 439 steel sheets of two different suppliers. In recent
years, this ferritic stainless steel has been applied in a
deep drawing process of automotive components. In this
way, it must be said that one of these ferritic stainless
steel sheets cracked due to exhaustion of formability
during deep drawing after few steps. On the other hand,
the second ferritic stainless steel sheet showed neither
cracking nor other type of defects. The results of the
tests, which were carried out in this work, probed that
the“r” value has a strong influence on the forming
behaviour of ferritic steel during deep drawing. This
information is very relevant because the AISI 439
standard does not consider the planar anisotropy or the
strain hardening coefficient as relevant for designation,
but this type of steel is being applied in many forming
operations of different components.