Title:
Cr-Ni ALLOY AND SEAMLESS STEEL PIPE FORMED OF Cr-Ni ALLOY
Document Type and Number:
WIPO Patent Application WO/2019/146504
Kind Code:
A1
Abstract:
Provided is a Cr-Ni alloy which has high yield strength and high resistance to sulfuric acid general corrosion at the high temperature of 250°C. This Cr-Ni alloy has a chemical composition which contains, in mass%, from 0.01% to 0.50% of Si, from 0.01% to 1.00% of Mn, from 21.0% to 27.0% of Cr, 40.0% or more but less than 50.0% of Ni, 4.5% or more but less than 9.0% of Mo, from 2.0% to 6.0% of W, more than 2.0% but 6.0% or less of Cu, from 0.01% to 2.00% of Co, from 0.001% to 0.010% in total of one or two elements selected from the group consisting of Ca and Mg, from 0.005% to 0.200% of sol. Al, and from 0.01% to 0.20% of N, with the balance made up of Fe and impurities. The dislocation density in this Cr-Ni alloy satisfies formula (1). (1): 8.00 × 1014 ≤ ρ ≤ 2.50 × 1015 + 1.40 × 1014 × [Cu + Co]
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Inventors:
TOMIO AKIKO (JP)
UEYAMA MASAKI (JP)
TOMIO YUSAKU (JP)
UEYAMA MASAKI (JP)
TOMIO YUSAKU (JP)
Application Number:
PCT/JP2019/001361
Publication Date:
August 01, 2019
Filing Date:
January 17, 2019
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C30/02; C22F1/00; C22F1/16
Domestic Patent References:
| WO2009119630A1 | 2009-10-01 |
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Other References:
KOICHI NAKAJIMA ET AL.: "Current Advances in Materials and Processes (CAMP-ISIJ", vol. 17, 2004, THE IRON AND STEEL INSTITUTE OF JAPAN, article "Evaluation method of dislocation density by use of X-ray diffraction"
G. K. WILLIAMSONW. H. HALL: "X-RAY LINE BROADENING FROM FILED ALUMINIUM AND WOLFRAM", ACTA METALLURGICA, vol. 1, no. 1, 1953, pages 22 - 31
H. M. RIETVELD: "A Profile Refinement Method for Nuclear and Magnetic Structures", JOURNAL OF APPLIED CRYSTALLOGRAPHY, vol. 2, 1969, pages 65 - 71
See also references of EP 3744865A4
G. K. WILLIAMSONW. H. HALL: "X-RAY LINE BROADENING FROM FILED ALUMINIUM AND WOLFRAM", ACTA METALLURGICA, vol. 1, no. 1, 1953, pages 22 - 31
H. M. RIETVELD: "A Profile Refinement Method for Nuclear and Magnetic Structures", JOURNAL OF APPLIED CRYSTALLOGRAPHY, vol. 2, 1969, pages 65 - 71
See also references of EP 3744865A4
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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