Ferritic/martensitic oxide dispersion strengthened steel with enhanced creep resistance and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-10011893-B2
Application number	US-201414485409-A
Country	US
Kind code	B2
Filing date	Sep 12, 2014
Priority date	Mar 5, 2014
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

Provided are a ferritic/martensitic oxide dispersion strengthened steel with increased high temperature creep resistance, including 0.02 to 0.2 wt % of carbon (C), 8 to 12 wt % of chromium (Cr), 0.1 to 0.5 wt % of yttria (Y 2 O 3 ), 0.2 to 2 wt % of molybdenum (Mo), 0.01 to 0.5 wt % of titanium (Ti), 0.01 to 1 wt % of manganese (Mn), 0.01 to 0.3 wt % of vanadium (V), 0 to 0.3 wt % of zirconium (Zr), 0 to 0.5 wt % of nickel (Ni), and the remaining content of iron (Fe), and a method of manufacturing the same. The ferritic/martensitic oxide dispersion strengthened steel may be useful as a material for core structural components of a nuclear power system, ultra supercritical pressure steam generator components of a thermal power plant, or engine components of an airplane due to a high tensile strength at 700° C. and excellent creep resistance.

First claim

What is claimed is:

1. A steel product comprising:
a matrix of ferritic/martensitic oxide dispersion strengthened steel, the matrix comprising:
iron (Fe),
0.02 to 0.2 wt % of carbon (C),
8 to 12 wt % of chromium (Cr),
0.1 to 0.5 wt % of yttria (Y 2 O 3 ),
0.2 to 2 wt % of molybdenum (Mo),
0.01 to 0.5 wt % of titanium (Ti),
0.01 to 1 wt % of manganese (Mn),
0.01 to 0.3 wt % of vanadium (V),
0.3 wt % or less but more than 0 wt % of zirconium (Zr),
0.5 wt % or less of nickel (Ni), and
free of tungsten (W),

wherein the ferritic/martensitic oxide dispersion strengthened steel comprises Y—Ti—O-based mixed oxide and Y—Zr—O-based mixed oxide that are dispersed throughout the matrix,
wherein, with 0.2 to 2 wt % of molybdenum (Mo) and without tungsten (W), the ferritic/martensitic oxide dispersion strengthened steel is configured to inhibit generation of a Laves phase in the matrix.

2. The steel product of claim 1 , wherein the ferritic/martensitic oxide dispersion strengthened steel further comprises nickel in an amount of 0.5 wt % or less.

3. The steel product of claim 1 , wherein the steel product comprises one selected from the group consisting of a nuclear fuel cladding, a duct in a reactor, a wire in a reactor, an end plug in a reactor, a rotor in an supercritical pressure steam generator of a thermal power plant, a shaft in an supercritical pressure steam generator of a thermal power plant, a disk in an airplane engine, and a nozzle in an airplane engine.

Assignees

• Korea Atomic Energy Res

Inventors

• Kim Tae Kyu
• Noh Sanghoon
• Choi Byoung-Kwon
• Kim Ki-Baik
• Jeong Yong-Hwan

Classifications

• B22F3/20

  by extruding · CPC title

• B22F3/18

  by using pressure rollers · CPC title

• B22F3/15

  Hot isostatic pressing · CPC title

• B22F5/00

  Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product · CPC title

• C22C38/28

  with titanium or zirconium · CPC title