Title:
STEEL SPRING WIRE, SPRING, STEEL SPRING WIRE PRODUCTION METHOD AND SPRING PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2018/012158
Kind Code:
A1
Abstract:
A steel spring wire is configured from steel, which consists of 0.5 mass% to 0.8 mass% of carbon, 1.0 mass% to 2.5 mass% of silicon, 0.2 mass% to 1.0 mass% of manganese, and 0.5 mass% to 2.5 mass% of chromium, the balance being made of iron and unavoidable impurities, and which has a tempered martensite structure. The hardness of a surface layer region, which is the region within 10 µm of the outer circumferential surface, is harder than the region that is not the surface layer region by only greater than 0 HV to 50 HV.
Inventors:
OKADA FUMINORI (JP)
SHIMIZU KENICHI (JP)
UWANO TAKAFUMI (JP)
SHIMIZU KENICHI (JP)
UWANO TAKAFUMI (JP)
Application Number:
PCT/JP2017/021367
Publication Date:
January 18, 2018
Filing Date:
June 08, 2017
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
SUMITOMO (SEI) STEEL WIRE CORP (JP)
SUMITOMO (SEI) STEEL WIRE CORP (JP)
International Classes:
C22C38/00; B21C3/02; C21D1/06; C21D7/06; C21D8/06; C21D9/02; C22C38/34
Foreign References:
| JP2014206219A | 2014-10-30 | |||
| JP2014055343A | 2014-03-27 | |||
| JP2012052218A | 2012-03-15 | |||
| JP2014227581A | 2014-12-08 |
Other References:
See also references of EP 3486344A4
Attorney, Agent or Firm:
KITANO, Shuhei et al. (JP)
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