Title:
STEEL WIRE FOR SPRING
Document Type and Number:
WIPO Patent Application WO/2023/013174
Kind Code:
A1
Abstract:
This steel wire for a spring is provided with a steel main body that has a linear shape, and an oxide layer that covers the outer peripheral surface of the main body. The steel constituting the main body contains 0.6-0.7 mass% C, 1.7-2.5 mass% Si, 0.2-1 mass% Mn, 0.6-2 mass% Cr, and 0.08-0.25 mass% V, the remainder consisting of Fe and unavoidable impurities. The composition of the steel constituting the main body is a tempered martensite composition. The oxide layer includes a high Si concentration layer having a maximum Si concentration of 2.5-5.5 times that of the main body. The main body includes a grain boundary oxide layer disposed so as to constitute the outer peripheral surface thereof and having a thickness of 0.5-2.5 μm.
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Inventors:
IZUMIDA HIROMU (JP)
NAKAJIMA TETSUYA (JP)
KONTANI HIROTO (JP)
NAKAJIMA TETSUYA (JP)
KONTANI HIROTO (JP)
Application Number:
PCT/JP2022/016153
Publication Date:
February 09, 2023
Filing Date:
March 30, 2022
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
International Classes:
C22C38/00; C22C38/34; C21D8/06; C21D9/52
Domestic Patent References:
| WO2021255848A1 | 2021-12-23 |
Foreign References:
| JP2004115859A | 2004-04-15 | |||
| JP2004300481A | 2004-10-28 | |||
| JP2017082251A | 2017-05-18 | |||
| JP2017201051A | 2017-11-09 |
Attorney, Agent or Firm:
KITANO, Shuhei et al. (JP)
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