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Production of hot rolled dual‐phase steel strip by coiling below martensite start temperature
Author(s) -
Maid Olaf,
Massip Antonio,
Streißelberger Alois,
Kaspar Radko
Publication year - 1985
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198500634
Subject(s) - metallurgy , materials science , martensite , nitriding , softening , titanium , dual phase steel , deformation (meteorology) , ferrite (magnet) , composite material , microstructure , layer (electronics)
The laboratory tests showed that a dual‐phase steel can be produced on the basis of the chemical composition given here, providing the coiling temperature is below the martensite start temperature. It is then possible to dispense with an additional air cooling period on the runout table, which is mandatory with production concepts known up to now. The best mechanical properties are attained at a coiling temperature of 200°C. The final rolling temperature should be around A r3 to avoid a heavy ferrite deformation without softening and, on the other hand, to reduce the yield stress increase caused by aging. Nitrogen aging can be suppressed by the addition of small amounts of titanium to bind nitrogen, forming a dispersion of titanium nitrides. The feasibility of this concept under production conditions was confirmed by means of hot rolling tests on a hot wide strip mill.