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Improving the r-value of warm rolled and annealed low carbon steel by adding chromium

journal contribution
posted on 2000-08-01, 00:00 authored by Matthew BarnettMatthew Barnett
The r-value of warm rolled and annealed low carbon steel sheet is prohibitively low for many forming applications. It can be improved by removing carbon from solution but this requires costly vacuum degassing as well as titanium and/or niobium addition. The present work explores the cheaper possibility of using Cr addition to improve the r-value and hence drawability of warm rolled and annealed steel strip. The addition of Cr was found to increase the degree of in-grain shear band formation occurring during rolling. This can be explained by the effect that Cr has on the strain rate sensitivity of the flow stress. When the Cr added grades were annealed the r-value was increased by up to 0.8. The maximum r-value seen here was 1.7. The optimum rolling conditions comprised an average warm rolling temperature of 675 °C and a total rolling reduction of 80%. The optimum annealing condition was a simulated batch annealing cycle. More work is required to understand the complex annealing phenomena displayed by these steels.

History

Journal

Steel research

Volume

71

Issue

8

Pagination

295 - 302

Publisher

Wiley

ISSN

0177-4832

Publication classification

CN.1 Other journal article

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