鋼板の加熱絞りの際に發生する表面龜裂に就て

概要

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In the case of hot pressing of thick or medium plates, such as end plates of boilers or disc plates for automobiles, numerous surface cracks may occur at the outer side of bends. In order to affirm the causes of such cracks, the actual working conditions and mechanism of the cracks produced were investigated, and the properties of steel plate, particularly under hot conditions, as well as the state of the variation of the properties due to oxidation when the material was heated in various gases were experimented. Further, specimens containing different percentages of copper, sulphur, oxygen, etc. were prepared, and the properties of such specimens under hot conditions and the effects of these elements upon the production of surface cracks were experimentally investigated. The results show that the principal cause for the surface cracks is the overheated working of the steel plate and is particularly the surface oxidation. Oxygen augments considerably the surface cracks and red-heat brittleness, whilst copper and sulphur increase red-heat brittleness in the existence of oxygen and also facilitate the surface cracks accompained with the surface oxidation. Although copper and sulphur exist in certain amounts as impurities, the surface cracks do not occur when the oxidation is prevented.
社団法人日本鉄鋼協会の論文
1938-07-25