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This report contains the joint contributions of the collaborative ECSC project between Centro Sviluppo Materiali (CSM), Arcelor, Instituto de Soldadura e Qualidade (ISQ), Società delle Fucine (Sdf) and the TNO, Institute of Industrial Technology. The main aim of the work was the development of a new grade of Cr-Mo steel for petrochemical plants, with improved mechanical and hydrogen-resistant properties. In order to achieve this objective, a semi-empirical approach based on a laboratory-scale production route was used. The main results of the research activities were as follows: - definition of an innovative steel composition with tailored additions of Ti, Co and B and low C content, at laboratory scale, with tensile properties 20 % higher than that for reference materials, with improved resistance to hydrogen attack; - development of welding consumable and welding procedures to obtain good weldability and welded joints with hardness value below 250 HV; - production of an industrial heat and scale up of the results obtained at laboratory scale; - a real welded joint using coupons tram industrial plate was produced, with the procedure defined in the preliminary work at laboratory scale. The Industrial heat, having lower boron content than the aimed one, showed some dishomogeneity in the obtained microstructures and properties, confirming the important role of this element in the control of steel hardenability. The principal benefits achievable through the increased properties are the reduction of thickness and weight of the reactors. The reduction of workability, transportation and erection costs were evaluated.

Additional information

Authors: TASSA O, Centro Sviluppo Materiali (CSM), Roma (IT);BOURGES P, Arcelor, La Défense (IT);PILLOT S, Arcelor, La Défense (IT);MENDES RODRIGUES M, Instituto de Soladura e Qualidade, Oreias (PT);DE CESARIS A, Società delle Fucine, Terni (IT);VAN WORTEL H, TNO Institute of Industrial Technology, Delft (NL)
Bibliographic Reference: EUR 21419 EN (2005), 100 pp. Euro: 15
Availability: (Catalogue Number: KI-NA-21419-EN-S)
ISBN: ISBN 92-894-9999-0
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