To reveal the possible use of laser technology in the ferrous metallurgy we started an M.E.(Ministry of Education) project in 1998. Based on the laser equipment of BAYATI and the experience of its collaborators and operated by DUNAFERR Research Institute we examined the following four fields: • laser cutting, • laser surface heat-treatment (quenching), • laser surface alloying, • laser cladding.In this paper the authors evaluated the most important results of the work done, the application areas of each method and the odds of the further steps.* Only the project managers of studies of R&D theme are indicated as authors of this paper.

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A new equipment was developed to investigate the thermal fatigue behaviour of laser surface treated layers. The equipment is appropriate to study the thermal fatigue of rollers. The compared test materials were CMo3 grade hardened and tempered steels with laser quenched, TiC alloyed and Stellite 6 coated surfaces. The comparison of the surfaces based on the time of the first crack net appearance, the hardness profile of the surface and the morphological parameters of the cracks.

Diverse technologies in domestic enamelling production for machining, cutting and joining process are applied. The experiments presented in this paper focused on the opportunities of replacement of the drawn tubes built in heat exchangers longitudinal seam pipes produced by DUNAFERR Co. Ltd. The steel grade which satisfies the requirement of two-side enamelling, formability and after-fire sag resistance has been investigated. It has been shown that the coldrolled DC 04 EK-B steel grades stand all demands needed and therefore are able to replace the imported drawn tubes presently used.

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