Mn-Si系, Mn-Si-Cr系およびMn-Si-Mo系鋼におよぼすTiおよびBの影響

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タイトル別名
  • Effect of Addition of Ti and B on Mn-Si, Mn-Si-Cr and Mn-Si-Mo Steels
  • Mn-Siケイ , Mn-Si-Crケイ オヨビ Mn-Si-Moケイ コウ ニ オヨボス Ti オヨビ B ノ エイキョウ
  • 構造用高抗張力鋼の研究-III
  • Study on high-strength structural steels-III

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Effects of addition of Ti and B on Mn-Si, Mn-Si-Cr or Mn-Si-Mo structural steel were studied in this report III, while effects of B and Mo on Mn-Si and Mn-Si-Cr steel had been studied in the last report II (Tets-to-Hagane, 47 (1961) 4, p. 585-591).<BR>There were 18 grades of specimens tested. The 1st group contained 6 grades of Mn-Si steel, the 2nd group contained 7 grades of Mn-Si-Cr steel and the 3rd group contained 5 grades of Mn-Si-Mo steel.<BR>All samples were melted with a high-frequency induction furnace and cast into about 7kg ingots, and then forged or rolled down to 16 or 35mm_??_ bars.<BR>Specimens were tested under various conditions such as air-cooling or furnace-cooling after heating and quench-and-tempering.<BR>Tensile strength, yield strength, elongation and reduction of area were determined by tensile test. Hardness-test and microstructure-tests as well as Jominy-end-quenching test to investigate into hardenability of specimens were also made.<BR>The results obtained were summarized as follows:<BR>(1) Addition of B to Mn-Si steel containning 0·3% Ti, improved hardness, tensile strength and yield point, and decreased elongation and reduction of area only a little, under the condition of air-cooling or quench-and-tempering at a point higher than 600°C.<BR>(2) Effects of adding B to Mn-Si-Cr steel with 0·3% Ti on mechanical properties were not recognized apparently.<BR>(3) Addition of B (0·0025-0·0050%) to Mn-Si-Mo steel containning 0·13% Ti was effective on improvement of hardness and tensile strength, while decrease of elongation and reduction of area was slight. This tendency was very evident in the condilion of tempering, especially.<BR>(4) Ti should be treated as a deoxidizer or denitrider. From the viewpoint of mechanical properties, Ti content should be less than 0·3% in Mn-Si-Cr and Mn-Si-Mo steels.<BR>From the viewpoint of hardenability, Ti content should be less than 0.1% in both Mn-Si steel and Mn-Si-Mo steels.<BR>(5) Addition of B improved hardenability of Mn-Si, Mn-Si-Cr and Mn-Si-Mo steels.

収録刊行物

  • 鉄と鋼

    鉄と鋼 49 (2), 149-154, 1963

    一般社団法人 日本鉄鋼協会

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