特殊鑄鋼の研究 (II) : Cr-Mo 鑄鋼の機械的性質に及ぼす Si の影響

概要

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Influence of C and Si on the hardness, tensile strength and impact resistance of Cr-Mo cast steels (Cr 1%, Mo 0.35%) were investigated. As the result of these investigation, it has been ascertained that the addition of Si to Cr-Mo cast steels gives a considerable influence upon the mechanical properties, that is, not only to improves the tensile strength, but also toughness such as elongation, reduction of area and impact resistance, and that the moderate quantity of Si are 1% for cast steel contained with C 0.25∿0.3%, Cr 1%, Mo 0.35% The most suitable quantity of Si has an intimate relation with the C content, and the effective limiting amount moves to the lower Si side according to the C content increases. The maximum tensile strength are obtained by adding Si up to 2% for 0.3% C Steel, Si 1.0∿1.2% for 0.4% C steel and Si 1% for 0.5% C steel. In case of tempering the impact value of Cr-Mo-Si cast steel shows the minimum values at 300°∿400℃, that is, due to the first temper brittleness. The Cr-Mo cast steel shows some inferiorities in mechanical properties as compared with the same forged steels, but the tensile strength in tempering at 600°or 700℃, are so improved as the forged special steels. In addition to these charaderistic, the Cr-Mo-Si cast steel is not recognized any significant difference in strength at the longitudinal and transverse direction.
社団法人日本鉄鋼協会の論文
1951-06-25