Title:
BEARING STEEL EXHIBITING EXCELLENT MACHINABILITY AFTER SPHEROIDIZING ANNEALING AND EXCELLENT RESISTANCE TO HYDROGEN FATIGUE AFTER QUENCHING/TEMPERING
Document Type and Number:
WIPO Patent Application WO/2012/073488
Kind Code:
A1
Abstract:
Provided is a bearing steel that exhibits excellent machinability after spheroidizing annealing and excellent resistance to hydrogen fatigue after quenching/tempering. By using a steel composition containing, by mass, 0.85-1.10% carbon, 0.30-0.80% silicon, 0.90-2.00% manganese, up to 0.025% phosphorus, up to 0.02% sulfur, up to 0.05% aluminum, 1.8-2.5% chromium, 0.15-0.4% molybdenum, up to 0.0080% nitrogen, up to 0.0020% oxygen, and more than 0.0015% but no more than 0.0050% tin, with the remainder comprising iron and unavoidable impurities, the formation of WEA is effectively inhibited, even in environments in which hydrogen penetrates, and rolling fatigue life is thus improved. Machinability properties such as cutting and forging performance are also improved.
Inventors:
HIRAI, Yasumasa (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
平井 康正 (〒11 東京都千代田区内幸町二丁目２番３号 ＪＦＥスチール株式会社 知的財産部内 Tokyo, 〒1000011, JP)
平井 康正 (〒11 東京都千代田区内幸町二丁目２番３号 ＪＦＥスチール株式会社 知的財産部内 Tokyo, 〒1000011, JP)
Application Number:
JP2011/006659
Publication Date:
June 07, 2012
Filing Date:
November 29, 2011
Export Citation:
Assignee:
JFE STEEL CORPORATION (2-3 Uchisaiwai-cho 2-chome, Chiyoda-ku Tokyo, 11, 〒1000011, JP)
ＪＦＥスチール株式会社 (〒11 東京都千代田区内幸町二丁目２番３号 Tokyo, 〒1000011, JP)
HIRAI, Yasumasa (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
ＪＦＥスチール株式会社 (〒11 東京都千代田区内幸町二丁目２番３号 Tokyo, 〒1000011, JP)
HIRAI, Yasumasa (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
International Classes:
C22C38/00; C22C38/60
Attorney, Agent or Firm:
SUGIMURA, Kenji (36F Kasumigaseki Common Gate West, 3-2-1 Kasumigaseki, Chiyoda-k, Tokyo 13, 〒1000013, JP)
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Claims:
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