Restricted Yield Strength Variation in High Strength Low Alloy Steels
Abstract:
Variability in the yield strength of High Strength Low Alloy sheet steel Is a major concern of the automotive Industry and other industries Involved in forming sheet metal. In order to have a material with a more consistent forming behavior, restrictions have been Imposed on the permissible yield strength variation. Achieving uniform properties requires identifying those components of the processing sequence that may have significant effect on yield strength variability of the product. Alloy design Is examined and optimized with regard to steelmaklng, hot strip mill processing capabilities, batch and galvanize line annealing capabilities. The use of low carbon steels containing columblum or columblum and vanadium together with silicon for solid solution strengthening achieves a family of steels that minimize yield strength variation. Cold rolled steels utilize that portion of the annealing cycle that achieves a fully recrystallization structure for steels with yield strengths of 50 ksi (345 HPA) and 60 ksi (414 MPa) and a recovered structure for steels with minimum yield strength of 70 ksi (483 MPA) and 80 ksi (552 MPA).
Keywords:
vanadium, yield strength, HSLA steel.
Author:
E. G. Hamburg
Affiiation
Jones & Laughlin Steel Corporation, Pittsburgh, Pennsylvania
PDF:
Source:
Vanadium Structural Steels - Reprint of papers on vanadium steel from the proceedings of “ASM HSLA Steels Technology and Applications Conference, Philadelphia, USA, Oct., 1983, pp.121-128
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