Al が鑄鋼の機械的性質および熱間龜裂に及ぼす影響

概要

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In January 1952, many large castings failed by pin-holes in a plane carbon steel casting shop, (Mito Steel Works, Hitachi, Ltd, ) To meet these accidents deoxidizing alminium was increased from 0.03% to 0.06% for the purpose of decreasing the gas pressure in molten steel. This action made decreased pin-holes, while hot tears had been increased so that aluminum addition was changed to the initial quantity, and in its place the quantity of Fe-Si was increased. Then the effect of alminium on the mechanical properties was traced up to hot tears. It was confirmed that the quantity of alminium as deoxidizer had little effect on the mechanical properties and the tendency to hot tears was inceased. These were, however, limited in heavy steel castings of dry-sand moulding. It was suggested that the case of a green sand moulding or small casting was out of question.
社団法人日本鉄鋼協会の論文
1954-04-25