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  • 1.
    Basu, Somnath
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Lahiri, Ashok Kumar
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Seetharaman, Seshadri
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Distribution of phosphorus and oxygen between liquid steel and basic oxygen steelmaking slag2009In: Revue de métallurgie (Imprimé), ISSN 0035-1563, E-ISSN 1156-3141, Vol. 106, no 1, p. 21-+Article in journal (Refereed)
    Abstract [en]

    The efficiency of dephosphorisation is governed by the thermodynamic behaviour of phosphorus and oxygen in molten metal, and P2O5 and FeO in slag. The equilibrium distribution of phosphorus and oxygen, for a wide range of chemical compositions simulating the evolution of slag composition during a typical BOF blow, has been experimentally determined. A mathematical model for estimation of the activity coefficients, as a function of the chemical composition, was also attempted.

  • 2.
    Edström, John Olof
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
    Steel research in Sweden2005In: Revue de métallurgie (Imprimé), ISSN 0035-1563, E-ISSN 1156-3141, Vol. 102, no 1, p. 103-105Article in journal (Refereed)
    Abstract [en]

    The author describes the steel research organisation that has been developed in Sweden from the middle of the twentieth century and reports on the most recent assessments of its cost effectiveness. Jernkontoret has been the central organization of the Swedish steel industry since1747. Jernkontoret originated several famous Swedish Institutes or Universities, such as the Royal Institute of Technology (KTH), Lulea University of Technology, Dalarna University, the Swedish Institute for Metal Research and MEFOS. The work of the institutes is funded by commissions from the Swedish or the foreign industry, and grants from the Swedish state and the European Union. Total costs of steel research in Sweden is on the order of 100 M-C per year. A recent Jernkontoret report concluded that the state aided joint research in the Swedish steel industry generated at least a fivefold return.

  • 3. Granbom, Ylva
    Influence of niobium and coiling temperature on the mechanical properties of a cold rolled dual phase steel2007In: Revue de métallurgie (Imprimé), ISSN 0035-1563, E-ISSN 1156-3141, Vol. 104, no 4, p. 191-197Article in journal (Refereed)
    Abstract [en]

    Dual-phase (ferrite-martensite) low-carbon sheet steels are produced by annealing in the intercritical temperature range to produce ferrite-austenite mixtures, followed by accelerated cooling to transform the austenite phase into martensite. Dual-phase steels have gained considerable importance over the conventional HSLA steels due to the high strength and formability achieved. A good formability is achieved by high deformation hardening, due to a fine distribution of martensite. A cold rolled DP-grade (TS 600 Wa), coiled at 550 degrees C, was compared with a steel of approximately the same analysis but with the addition of 0.015 wt% Nb, coiled at 520 and 600 degrees C respectively. The Nb-addition refines the ferrite grain size substantially and a more uniform grain shape is achieved. The smaller grain size of the ferrite and martensite phases, results in a material with better formability. It appears that coiling at 520 degrees C results in a slightly better formability than coiling at 600 degrees C. The material shows a lower (alpha ->gamma start temperature, probably due to easier dissolution of thinner carbides, compared to the strip coiled at 600 degrees C. The recrystallization and phase transformation behavior was studied using the laser ultrasonic technique (LUS). Developing the LUS-technique for use in-line during annealing would open new ways of optimizing and controlling the mechanical properties of the final strip.

  • 4.
    Gyllenram, Rutger
    et al.
    KTH.
    Ekerot, Sven
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
    Jönsson, Pär
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
    Lubricating the recycling machine2012In: Revue de métallurgie (Imprimé), ISSN 0035-1563, E-ISSN 1156-3141, Vol. 109, no 5, p. 349-358Article in journal (Refereed)
    Abstract [en]

    When introducing a new control paradigm in industry or society one has to accept that it is an evolutionary process where people, methods and processes must develop simultaneously, and this takes time. The recycling of material has been studied intensely for the last ten years using different approaches to material flow analyses, MFAs. They have given a good view of the magnitude of material flows but their use has been limited by lack of relevant data. In the case of recycling, data must be acquired from the practitioners of the trade and in order to get it, the value of the output for them and for society must be proved and visualized. This paper is based on a MFA model developed at KTH for steel flows in Sweden (part of the Swedish environmental research program, the "Steel-Eco-Cycle"). The aim of the work reported on here was to initiate the process of motivating better sampling of data in industry and society for performing MFAs. The KTH model is based on a product-to-product approach for steel, describing the recycling machine. Data is presented in a simplified model for Sweden with total figures and figures per capita. Areas where improvements can be made are identified and ways to "lubricate" the recycling machine are discussed. The main idea is to provide a way of describing flows that can be of use to recyclers and steel producers and form a basis for discussions on improvements. Finally, the underlying model is briefly described and the uncertainties of data are discussed.

  • 5.
    Hertzman, Staffan N.
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
    Charles, J.
    GM APERAM I R&D, St Denis, France.
    On the effect of nitrogen on duplex stainless steels2011In: Revue de métallurgie (Imprimé), ISSN 0035-1563, E-ISSN 1156-3141, Vol. 108, no 7-8, p. 413-425Article in journal (Refereed)
    Abstract [en]

    One of the key issues in the development of the modern duplex stainless steels was the introduction of nitrogen as an alloying element. This was made possible by e. g. the AOD process and has meant that the problems with earlier grades regarding weldability could be solved. The prime reason for the lower weldability, namely a coarse-grained heat affected zone with inferior properties was then removed. Further beneficial effects of nitrogen increases in the new generation of duplex grades were pointed out: localized corrosion resistance particularly in chloride containing solutions, enhancement of fatigue properties, improved creep properties particularly when considering heat treatment ... The paper will outline the influence of nitrogen additions in duplex grades by means of thermodynamic calculations including phase diagrams, TTT phase precipitation diagrams from metallographic investigations, mechanical and corrosion properties. Metallographic investigations, corrosion resistance properties and mechanical properties will be presented. The specific links between welded joints microstructures and properties with different nitrogen contents will be discussed.

  • 6.
    Jönsson, Pär
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
    Jonsson, Lage
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
    Alexis, Jonas
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Bentell, Lars
    Focus on clean steel within Jernkontoret's Research - an overview2008In: Revue de métallurgie (Imprimé), ISSN 0035-1563, E-ISSN 1156-3141, Vol. 105, no 6, p. 317-326Article in journal (Refereed)
    Abstract [en]

    Some highlights from the Jernkontoret Research with focus on the modeling work of the lost decade are presented. First the concept of a fundamental mathematical model is discussed. Thereafter, a short review of growth and separation models based on fundamental modeling of ladles is presented. Then, recent modeling efforts within Jernkontoret's Research are highlighted.

  • 7.
    Narayanan, Krishnamurthy
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Energy and Furnace Technology.
    Wang, W.
    KTH.
    Blasiak, Wlodzimierz
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Energy and Furnace Technology.
    Ekman, T.
    Flameless oxyfuel combustion: technology, modeling and benefits in use2006In: Revue de métallurgie (Imprimé), ISSN 0035-1563, E-ISSN 1156-3141, Vol. 103, no 5, p. 210-217Article in journal (Refereed)
    Abstract [en]

    Flameless oxyfuel combustion used in industrial furnaces gives a uniform temperature and heat flux distribution along with high available heat. NOx emissions can be maintained at extremely low levels, meeting the most demanding environmental regulations. Since 2003 the experimental results from flameless oxyfuel technology have been proven in industrial installations such as reheating and annealing furnaces as well as in ladle preheating stations.

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