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Ferritic stainless steel sheet, such as 17%Cr stainless steel, tend to form a surface defect called roping (or ridging) during deep drawing process. The metallurgical causes generating the roping are analysed and discussed in terms of texture and microstructure heterogeneities resulting from detailed metallographical and X-ray analysis on 17Cr steels showing various levels of roping. Possible methods for preventing the roping phenomenon have been investigated. One of the most effective ways to modify the textural and microstructural pattern involves the cold rolling of a ferrite matrix containing a certain quantity of hard phases, like the martensite, homogeneously dispersed in the system. This is possible with some operation of austenitizing heat treatments (infracritical annealing) and cold rolling. Several production cycles have been tested in laboratory with different sequences of operations of infracritical annealing and cold rolling. The manufacture of an industrial heat having a particular chemical composition to verify the applicability of new cycle including infracritical annealing.

Additional information

Authors: FORTUNATI S, Centro sviluppo materiali SpA, Roma (IT);CAMPOPIANO A, Centro sviluppo materiali SpA, Roma (IT)
Bibliographic Reference: EUR 16697 IT (1997) 147pp., FS, ECU 25.00
Availability: Available from the (2)
ISBN: ISBN 92-828-0955-2
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