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Patent Searching and Data


Title:
HIGH-STRENGTH SPRING STEEL WIRE, HIGH-STRENGTH SPRINGS AND PROCESSES FOR PRODUCTION OF BOTH
Document Type and Number:
WIPO Patent Application WO/2008/102573
Kind Code:
A1
Abstract:
The invention provides a high-strength spring excellent in corrosion fatigue characteristics; a steel wire for high -strength springs; and processes for the production of both. A steel wire for high-strength springs which contains by mass C: 0.35 to 0.50%, Si: 1.00 to 3.00%, Mn: 0.10 to 2.00%, P: 0.015% or below, and S: 0.015% or below with the balance consisting of Fe and unavoidable impurities, characterized in that in the differential scanning calorimetry accompanied with heating from 50°C to 600°C at a temperature rise rate of 0.25°C/s, an exothermic reaction peak is present only at 450°C or above; high-strength springs; and a process for the production of high-strength springs, characterized by conducting tempering under the conditions satisfying the following relationship (wherein T[K] is tempering temperature; t[s] is tempering time; and Si%[mass%] is content of Si): 16000 < (T-40Œ[Si%]) Œ (31.7+log t) < 23000

Inventors:
KUBOTA MANABU (JP)
HASHIMURA MASAYUKI (JP)
Application Number:
PCT/JP2008/050226
Publication Date:
August 28, 2008
Filing Date:
January 07, 2008
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
KUBOTA MANABU (JP)
HASHIMURA MASAYUKI (JP)
International Classes:
C22C38/00; C21D9/02; C21D9/52; C22C38/04; C22C38/60; F16F1/02
Foreign References:
JP2006291291A2006-10-26
JPH09324219A1997-12-16
JP2004143482A2004-05-20
JP2002356747A2002-12-13
Other References:
See also references of EP 2058414A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (Toranomon 37 Mori Bldg.5-1, Toranomon 3-chome,Minato-k, Tokyo 23, JP)
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