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New cold‐rolled deep‐drawing grades
Author(s) -
Herman JeanClaude,
Durme Christophe Van,
Neutjens Joeri
Publication year - 1999
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199905666
Subject(s) - formability , annealing (glass) , metallurgy , materials science , grain size , elongation , anisotropy , hot rolled , deep drawing , plasticity , composite material , ultimate tensile strength , physics , quantum mechanics
An unstabilised ultra low carbon steel (12 ppm of C) offers an attractive combination of formability properties like yield strength, elongation, mean r ‐value and BH‐index. The major drawback is its large planar anisotropy. This is attributed to the large grain‐size of the hot‐rolled product. An increase in the cooling rate (using ultra fast cooling technology) or a decrease in the coiling temperature do not refine the hot‐band grain size. However, an optimisation of the cold‐rolling and the annealing sequences result in a better balance of the drawing properties. Alloying elements like Cr, B, V, Al. Si or reduction of Mn content exert only a minor influence on the final properties. An addition of Nb (mass contents of 0.01 %) improves the drawability but decreases the BH‐index when conventional continuous annealing temperatures are applied.