Title:
CHROMIUM-BASED TWO-PHASE ALLOY PRODUCT AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2017/168640
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a product obtained using a low cost chromium-based two-phase alloy having high corrosion resistance and good mechanical characteristics at levels not lower than the prior art, and to provide a method for producing same. This chromium-based two-phase alloy product is a product obtained using a chromium-based two-phase alloy in which two phases, namely ferrite phases and austenite phases, are mixed together, the product being characterized in that: the chemical composition of the chromium-based two-phase alloy comprises primary components, secondary components, impurities and optional secondary components; the primary components comprise 34-70 mass% of Cr, 17-45 mass% of Ni and 10-35 mass% of Fe, with the content by mass of Cr being the highest and the total content of Ni and Fe being 30-65 mass%; the secondary components comprise 0.1-2 mass% of Mn and 0.1-1 mass% of Si and contain more than 0 mass% and not more than 1 mass% of Ti, more than 0 mass% and less than 0.5 mass% of V and more than 0 mass% and not more than 0.02 mass% of N; the impurities contain not more than 0.04 mass% of P, not more than 0.01 mass% of S, not more than 0.03 mass% of C, not more than 0.02 mass% of N and not more than 0.03 mass% of O; and the product has a forged structure in which the average crystal grain diameter is 30 µm or less as a microstructure, a ferrite phase occupancy ratio of 15-85%, and a 0.2% proof stress of 600 MPa or more and a breaking elongation 5% or more in a room temperature tensile test.
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Inventors:
OGATA MAKOTO (JP)
NOUJIMA MASAFUMI (JP)
KIMURA TOMONORI (JP)
AONO YASUHISA (JP)
NOUJIMA MASAFUMI (JP)
KIMURA TOMONORI (JP)
AONO YASUHISA (JP)
Application Number:
PCT/JP2016/060432
Publication Date:
October 05, 2017
Filing Date:
March 30, 2016
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
C22C27/06; C22C30/00
Domestic Patent References:
| WO2016052445A1 | 2016-04-07 |
Foreign References:
| JPS512413B1 | 1976-01-26 | |||
| JPH07118809A | 1995-05-09 | |||
| JPS62260037A | 1987-11-12 | |||
| JP2006152412A | 2006-06-15 | |||
| JPH07197181A | 1995-08-01 |
Attorney, Agent or Firm:
POLAIRE I.P.C. (JP)
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