Effect of Molybdenum Content on Hardenability of Boron and Molybdenum Combined Added Steels

  • Kyohei IshikawaEmail author
  • Hirofumi Nakamura
  • Ryuichi Homma
  • Masaaki Fujioka
  • Manabu Hoshino
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


The upper limit of the Mo-B combined effect on hardenability was investigated in 0.15%C-B added steels containing 0 to 1.5%Mo. The hardenability of Mo-B steels increases up to 0.75%Mo suppressing the precipitation of Fe23(C,B)6. In contrast, the effect decreases over 0.75%Mo where Mo2FeB2 precipitates instead of Fe23(C,B)6. By thermodynamic calculation, it is suggested that Mo2FeB2 precipitates during reheating and the precipitation of Mo2FeB2 decreases the solute B content in reheating, which determines the limit of the Mo-B combined effect.


Hardenability Boron Segregation Molybdenum Combined effect 


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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  • Kyohei Ishikawa
    • 1
    Email author
  • Hirofumi Nakamura
    • 1
  • Ryuichi Homma
    • 2
  • Masaaki Fujioka
    • 1
  • Manabu Hoshino
    • 1
  1. 1.Nippon Steel & Sumitomo Metal Corporation, Steel Research LaboratoriesFuttsuJapan
  2. 2.Nippon Steel & Sumitomo Metal Corporation, Kimitsu R&D LaboratoriesChibaJapan

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