High-strength stainless steel
AssigneePosco
InventorsJong Jin Jeon, Mi-Nam Park, Sang Seok Kim
Life of this patent
Estimating the term…
Abstract
A stainless steel with a yield strength of 2,200 MPa or more is disclosed through the generation of the strain-induced martensite phase and the increase of the martensite phase strength. A high strength stainless steel according to an embodiment of present disclosure includes, in percent (%) by weight of the entire composition, C: 0.14 to 0.20%, Si: 0.8 to 1.0%, Mn: more than 0 and 0.5% or less, Cr: 15.0 to 17.0%, Ni: 4.0 to 5.0%, Mo: 0.6 to 0.8%, Cu: 0.5% or less, N: 0.05 to 0.11%, the remainder of iron (Fe) and other inevitable impurities, and C+N: 0.25% or more and Md30 value satisfies 40° C. or more.
Claims5
A high strength stainless steel comprising, in percent (%) by weight of the entire composition, C:
- 0.14 to 0.20%, Si:
- 0.8 to 1.0%, Mn:
- more than 0 and 0.5% or less, Cr:
- 15.0 to 17.0%, Ni:
- 4.0 to 5.0%, Mo:
- 0.6 to 0.8%, Cu:
- 0.5% or less, N:
- 0.05 to 0.11%, the remainder of iron (Fe) and other inevitable impurities, and
- C+N:
- 0.25% or more and Md30 value represented by a following Equation (1) satisfies 40° C. or more
- Md30(° C.)=551−462*(C+N)−9.2*Si−8.1*Mn−13.7*Cr−29*(Ni+Cu)−18.5*Mo (1)
- (Here, C, N, Si, Mn, Cr, Ni, Cu, Mo mean the content (% by weight) of each element).
Dependencies are inferred from the claim text.