Method for producing martensitic precipitation-hardening stainless steel and method for producing martensitic precipitation-hardening stainless steel products

The method for producing martensitic precipitation-hardening stainless steel optimizes cooling rates and temperatures to balance 0.2% yield strength and toughness, addressing the weakness of existing technologies under high aging temperatures.

JP7830994B2Active Publication Date: 2026-03-17PROTERIAL LTD
View PDF 7 Cites 0 Cited by

Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-02-24
Publication Date
2026-03-17

Smart Images

  • Figure 0007830994000004
    Figure 0007830994000004
  • Figure 0007830994000001
    Figure 0007830994000001
  • Figure 0007830994000002
    Figure 0007830994000002
Patent Text Reader

Abstract

To provide a method for producing a martensitic precipitation hardening stainless steel excellent in a balance between 0.2% proof stress and toughness upon applying aging treatment conditions with a high aging treatment temperature, and a product produced thereby.SOLUTION: There is provided a method for producing a martensitic precipitation hardening stainless steel in which a heat treatment stock having a composition of a martensitic precipitation hardening stainless steel is subjected to solution treatment and aging treatment so as to be a heat-treated material. In the solution treatment, the heat treatment stock is heated at 1,020 to 1,080°C so as to be held, and then rapidly cooled. In the aging treatment, the heat treatment stock is heated at 570 to 630°C so as to be held and then subjected to a first cooling step of cooling the same at the average cooling rate of 50°C / h or less from 300 to 500°C and a second cooling step of cooling the same at the average cooling rate of air cooling or more subsequently to the first cooling step. Also provided is a product produced by this production method.SELECTED DRAWING: Figure 1
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Heat treatment method for improving low carbon martensite precipitation hardening stainless steel yield ratio

    CN110628997A

  • JP18387A

  • Production of structural member

    JP1994235020A

  • Production of martensitic precipitation hardening type stainless steel

    JP1995258729A

  • Production of corrosion resisting high strength member

    JP1996085824A