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(11) | EP 2 562 272 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Method for producing steel product having excellent mechanical properties, steel product produced with the method and its use |
| (57) The invention relates to a method for producing a steel product having excellent
mechanical properties and to a steel product produced by the method and used, in particular,
for manufacturing components for automotive industry, inter alia. In addition, the
invention relates to the use of a strain hardened steel pipe and to the manufacturing
of said component. The invention is based on the idea that in the micro structure
of a steel pipe to be heated very rapidly there is provided a strain hardened structure
that is not soft annealed prior to the very rapid heating. Further, it is essential
for the invention that the very rapid heating is followed by immediate cooling such
that the micro structure formed in the steel product comprises at least 30% by volume
martensite and/or bainite. The invention has significant advantages as to both a production
chain and mechanical properties of the product.
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