Thyssenkrupp Automotive Ag

Thyssenkrupp Federn Und Stabilisatoren Gmbh

Matthias Hüttner

Lutz Manke

Hans Dziemballa

Alexander Borowikow

Reinhard Uhrich

Hans Vondracek

The invention relates to a method for the thermomechanical treatment of steel. According to said method, the parent material is heated to a temperature in excess of the re-crystallization temperature, the structure is austenitized, held at an equalized temperature and then formed and subsequently quenched to form martensite and tempered. Round steel bars, whose re-crystallization temperature is adjusted over the bar length in a compensation furnace, constitute the parent material. The round steel bars are subsequently re-modeled by cross-rolling, remaining substantially straight and after the critical deformation degree has been exceeded are subjected to dynamic re-crystallization processes. The round steel bars are then subjected to a post-heating process above the Ac3 temperature, in order to undergo a complete static re-crystallization and finally are quenched from the austenitic state to form martensite and tempered.

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Strassberg, Germany

Matthias Hüttner