Invention Grant
- Patent Title: Nickel-containing steel for low temperature
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Application No.: US17751338Application Date: 2022-05-23
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Publication No.: US11578394B2Publication Date: 2023-02-14
- Inventor: Tetsuya Namegawa , Manabu Hoshino , Shinichi Omiya , Takayuki Kagaya
- Applicant: NIPPON STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: NIPPON STEEL CORPORATION
- Current Assignee: NIPPON STEEL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Main IPC: C22C38/00
- IPC: C22C38/00 ; C22C38/04 ; C22C38/06 ; C22C38/54 ; C21D1/18 ; C21D6/00 ; C21D8/02 ; C22C38/16 ; C22C38/44 ; C22C38/46 ; C22C38/48 ; C22C38/50

Abstract:
A nickel-containing steel for low temperature according to an aspect of the present invention has a chemical composition within a predetermined range, in which a metallographic structure of a thickness middle portion contains 2.0 vol % to 20.0 vol % of an austenite phase, an average grain size of prior austenite grains is 3.0 μm to 15.0 μm, an average aspect ratio of the prior austenite grains is 1.0 to 2.4, a plate thickness is 4.5 mm to 30 mm, the chemical composition and the average grain size of the prior austenite grains are further limited depending on the plate thickness, a yield stress at room temperature is 460 MPa to 710 MPa, and a tensile strength at the room temperature is 560 MPa to 810 MPa.
Public/Granted literature
- US20220282362A1 NICKEL-CONTAINING STEEL FOR LOW TEMPERATURE Public/Granted day:2022-09-08
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