This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
The Development of High Strength Galvanized Steels for Automotive Applications
Annotation ability available
Sector:
Language:
English
Abstract
Results of a continuing program to develop a family of Cb-microalloyed high strength galvanized steels are described here. Laboratory and production data indicate that “in-line” annealed fully recrystallized sheet products having yield strengths ranging from 40 ksi (276 MPa) to 60 ksi (414 MPa) can be produced on selected galvanizing lines. Statistical analyses of production data for these steels indicate that the variation in mechanical properties from coil to coil is quite small. Sheet products having yield strengths ranging from 70 ksi (483 MPa) to 140 ksi (965 MPa) with limited ductility are over produced by recovery annealing. Pre-annealing followed by galvanizing is currently being used for such products. However, laboratory work shows that “in-line” recovery annealing should be successful for these products. Limited production of “in-line” recovery annealed 120 ksi (828 MPa) min. yield strength product supports these studies.
Hot rolled high strength galvanized steels are also being produced. These steels range in yield strength from 40 ksi (276 MPa) to over 80 ksi (552 MPa). Limited laboratory and production data indicate that galvanizing can cause either aging or simultaneous aging and softening depending on the annealing temperature. However, the effect upon tensile properties is minimal.
The future for high strength galvanized steels looks bright because of the continuing emphasis on weight reduction and corrosion protection by the major automobile producers. Continuing development and production efforts are expanding the variety of the various H. S. galvanized steel products aimed at meeting automotive demands.
Authors
Citation
Smith, G., Aichbhaumik, D., Gronceski, G., and Brinsky, J., "The Development of High Strength Galvanized Steels for Automotive Applications," SAE Technical Paper 830515, 1983, https://doi.org/10.4271/830515.Also In
References
- Cotterill P. Mould P. R. Recrystallization and Grain Growth in Metals, Chapters 5 and 6 John-Wiley and Sons, Inc. N.Y. 1976
- Meyer L. Heisterkamp F. Mueschenborn “Columbium, Titanium and Vanadium in Normalized, Thermomechanically Treated and Cold Rolled Steels,” Proceedings Microalloying ‘75 Washington, D.C. 1975 153 167
- Davidson A. P. West D. F. “ Structural and Textural Aspects of Deformation and Recrystallization of Low-Carbon Steels Containing Dispersions of Nb (CN),” Metal Science 13 March-April 1979 170 178
- Jones J. J. Weiss I. “Effect of Precipitation on Recrystallization in Microalloyed Steels,” ibid 238 245
- Mitchell J. W. Chang U. I. “Resistance-Spot Welding of Microalloyed Steels for Automotive Applications,” Proceedings Microalloying ‘75 Washington, D.C. 1975
- Myers R. H. Walpole R. E. Probability and Statistics for Engineers and Scientists MacMillan Co., Inc. 2nd Ed. N.Y. Chapters 3 and 4.
- Box G. E. P. Hunter W. G. Hunter J. S. Statistics for Experimenters John Wiley and Sons, Inc., N.Y. Chapter 3.