焼ならしした中炭素鋼の引張性質におよぼすSiおよびMn量の影響
1973 年 59 巻 1 号 p. 112-124
詳細
1973 年 59 巻 1 号 p. 112-124
Effects of Si and Mn additions on the tensile properties of medium carbon steels have been investigated to assess the utility as non-ardened high strength steels. Results concerning 0.3%C-Si-Mn steels are summarized as follows:
(1) The tensile strength increases 9.5 kg/mm2 per 1% of Si+Mn up to the transitional value of 1.7%Mn, over which the strength is raised only with a rapid fall of elongation due to lowtemperature transformation.
(2) The larger the Si/Mn ratio in the steels up to about 6, the higher strength can be obtained with little decrease of elongation, so far as the steels keep ferrite-pearlite structure.
(3) The limit to strengthen these steels holding at least 18% elongation is estimated to about 90 and 70 kg/mm2 for tensile and yield strengths respectively. Concerning with 0.47%C-Si-Mn steels,
(4) The larger the Si/Mn ratio up to about 2, the higher elongation can be obtained.
(5) The limit to strengthen these steels holding at least 18% elongation is estimated to about 977and 63 kg/mm2 for tensile and yield strength respectively.
