MARTENSITIC STAINLESS STEEL MATERIAL

WIPO Patent Application WO/2023/228784

A1

Provided is a martensitic stainless steel material which has high strength and excellent corrosion resistance in a corrosive environment in which SOx and NOx are included. A martensitic stainless steel material according to the present disclosure satisfies the chemical composition set forth in the description, while satisfying formula (1). The yield strength is 862 MPa or more. With respect to this martensitic stainless steel material, the ratio of the number of Mg oxides having a circle-equivalent diameter of 2.0 µm or more to the total number of Ca oxides having a circle-equivalent diameter of 2.0 µm or more, Ca sulfides having a circle-equivalent diameter of 2.0 µm or more and Mg oxides having a circle-equivalent diameter of 2.0 µm or more is 45% or more.　(1): 0.0010 ≤ Ca + Mg ≤ 0.0050 The atomic symbols in formula (1) are assigned with the contents (% by mass) of the corresponding elements.

JP2009191322	CASE-HARDENED STEEL SUPERIOR IN GRAIN-COARSENING RESISTANCE FOR USE IN CARBURIZED PARTS
JPH10121186	CENTRIFUGALLY CAST SLEEVE ROLL AND ITS PRODUCTION
JP4344126	High frequency tempered steel with excellent torsional properties

KANKI KYOHEI (JP)
MATSUO DAISUKE (JP)
ARAI YUJI (JP)

PCT/JP2023/017933

November 30, 2023

May 12, 2023

Click for automatic bibliography generation  

NIPPON STEEL CORP (JP)

C22C38/00; B21B1/16; B21B1/22; B21B3/00; B21B19/04; B21B19/10; C21C7/00; C21D6/00; C21D8/00; C21D9/08; C22C38/54

WO2022075405A1	2022-04-14
WO2022075406A1	2022-04-14
WO2023074657A1	2023-05-04

JP2018035381A	2018-03-08
JP2019143228A	2019-08-29

ASCEND IP LAW FIRM (JP)

View/Download PDF      PDF Help

Previous Patent: MARTENSITIC STAINLESS STEEL MATERIAL

Next Patent: ACOUSTIC SIGNAL PROCESSING DEVICE, ACOUSTIC SIGNAL PROCESSING METHOD, AND PROGRAM