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Advanced high strength cold rolled sheet steels (AHSS) with optimised profiling properties produced through different lines (AHSS-PROFILE)
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Advanced high strength cold rolled sheet steels (AHSS) with optimised profiling properties produced through different lines (AHSS-PROFILE)

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The current work aimed to develop cold rolled steel sheets with Rm > 1000 MPa optimised for roll forming to be produced in existing continuous annealing lines with either gas (CAL-GQ) or water quenching (CAL-WQ) and in hot dip galvanising (HDG) lines. The result of the project is a significant improvement in roll formability for materials produced in all three lines, compared to state of the art materials of the same strength level. The three steels developed within the project also reached the target values in terms of bendability (Ri/t < 2) and hole expansion ratio (punched) >25%. For the HDG line, the optimum microstructure consisted of bainite and small amounts of untempered martensite to reach the necessary strength level. A key to produce these steels is to avoid polygonal ferrite by using a relative high annealing temperature and well balanced amount of hardenable elements. For CAL-GQ with overaging section, the optimum microstructure consists of lower bainite, tempered martensite, and possibly a few percent ferrite. The process window in this line is largest, even Rm > 1200 MPa materials were produced in this line with good formability. For CAL-WQ with tempering section, the optimum microstructure is a highfraction martensite DP steel tempered at relative high temperature. This steel can be produced with very lean chemistries but controlling the amount and distribution of martensite is challenging.
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ISSN 1831-9424
ISBN 978-92-79-54039-4
DOI 10.2777/622704
Numero di catalogo KI-NA-27615-EN-N
ISSN 1018-5593
ISBN 978-92-79-54038-7
DOI 10.2777/844354
Numero di catalogo KI-NA-27615-EN-C
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ISSN 1831-9424 ISBN 978-92-79-54039-4 DOI 10.2777/622704 Numero di catalogo KI-NA-27615-EN-N
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ISSN 1018-5593 ISBN 978-92-79-54038-7 DOI 10.2777/844354 Numero di catalogo KI-NA-27615-EN-C
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