Community Research and Development Information Service - CORDIS


Final report on Contract No 7210-PR/047, 1 July 1997 to 30 June 2000

The main objective has been to increase the behaviour of some steel components through the modification of the inclusion type, looking for an inclusion engineering of deformable non-metallic inclusions, less hazardous on fatigue behaviour. This leads to the use of a silicon-killed route and the control of the secondary steelmaking process.

Progressively steelmakers have introduced changes in their production routes (EAF, LF and billet casting, or LD, LF, optional LH and bloom casting) to place the inclusion composition on the zone of low melting point of the ternary diagram CaO-SiO(2)-Al(2)O. End-producers' work has been focused on testing cleanliness of the wire rod using fatigue tests (Nakamura and spring tests) to verify the suitability of the process modifications (acid slags, low basicity, reduction of aluminium, thallium, and total oxygen contents as low as possible).

Fatigue test results were satisfactory in the last stages of the project, finding no inclusion as a cause of failure in, at least, one heat per steelmaker, produced with the final process modifications. The cleanness level attained was good, although the size of casting semi-products plays an important role in the final results, as higher rolling reductions lead to cleaner wire rods.

The objectives of the project were largely achieved, but further work is needed to guarantee repeatability during standard production sequences.

Additional information

Authors: BERTRAND C, Sidenor I+D, Basauri (ES);MOLINERO J, Sidenor I+D, Basauri (ES);ELVIRA R, Sidenor I+D, Basauri (ES);VALENTIN P, Saarstahl, Völklingen (DE);SCHIFFERI H, VASD, Leoben (AT);WILD M, H. Garphyttan, Garphyttan (SE);BARTHOLD G, Innotec, Markfredwitz (DE)
Bibliographic Reference: EUR 20316 EN (2002), pp.138. Euro: 20.50
Availability: EUR-OP reference: KI-NA-20316-EN-S Available from EUR-OP sales agents. URL:
ISBN: ISBN: 92-894-3651-4
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