Process for manufacturing of a steel product and product obtained

摘要

For the production of a steel component (15), e.g. for construction, the steel has an initial metastable phase to give it a first set of characteristics. The material is processed in a second phase by a thermodynamic action which gives the steel a second set of characteristics. The first phase is austenite, and the second phase is bainite or martensite. The component has alternating soft zones (10) and hard zones (11) with a circular cross-section (B,C). During the second phase the hard zones resist distortion to give only an out-of-round shape (B'), and the soft zones (10') collapse readily into a star shape (C').