Case hardened steel and method for producing same

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United States of America Patent

PATENT NO 9115415
APP PUB NO 20130174943A1
SERIAL NO

13823814

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Abstract

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A case hardened steel with excellent cold forgeability and excellent impact properties after case hardening processing contains C, Si, Mn, S, Cr, Al, Ti, Nb, B, and N, with the balance being iron and unavoidable impurities. Of precipitates containing Ti and/or Nb, precipitates having a size of not less than 20 μm2 are at a number density of not more than 1.0/mm2. Of precipitates containing Ti and/or Nb, precipitates having a size of more than 5 μm2 and less than 20 μm2 and containing Mn and S are at a number density of more than 0.7/mm2 and not more than 3.0/mm2. The ferrite fraction is more than 77% by area.

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Patent Owner(s)

  • KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.);KOBE STEEL, LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Nagahama, Mutsuhisa Kobe, JP 7 21
Okamoto, Nariaki Kobe, JP 2 6

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