アーク製鋼炉用電極黒鉛の熱応力強度の評価

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This paper is to present a technique to determine the thermal shock resistance of electrode graphite by a basic analysis of non-steady thermal stress in a circular disk heated by an arc discharge at its central area. The thermal shock resistance is defined as Δ=σθk/Eα, (σθ; circumferential tensile thermal stress, k; thermal conductivity, E; Youngs modulus, α; thermal expansion coefficient) and is determined en bloc only by measuring the electric power of the arc discharge using the specific non-dimensional thermal stress S* which is calculated theoretically as the maximum saturation stress in the non-dimensional diffusion time τ>1/4. This technique is also available to measure simultaneously the thermal diffusivity κ=k/cρ (c; specific heat, ρ; density) using the specific non-dimensional diffusion time τ* calculated theoretically as the heat reaching time from the center to the periphery of the disk after the arc discharge heating. The experimental studies for several kinds of graphite for an arc furnace steel making were carried out and compared with the values of σθk/Eα and k/cρ estimated indirectly from these individual mechanical and physical properties.
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