Martensitic stainless steel sheet

Patent metadata

Field	Value
Publication number	US-2019119775-A1
Application number	US-201716090649-A
Country	US
Kind code	A1
Filing date	Mar 9, 2017
Priority date	Apr 12, 2016
Publication date	Apr 25, 2019
Grant date	—

Abstract

A martensitic stainless steel has a chemical composition containing, by mass %, C: 0.030% or more and less than 0.20%, Si: 0.01% or more and 2.0% or less, Mn: 0.01% or more and 3.0% or less, P: 0.050% or less , S: 0.010% or less, Cr: 10.0% or more and 16.0% or less, Ni: 0.01% or more and 0.80% or less, Al: 0.001% or more and 0.50% or less, Zr: 0.005% or more and 0.50% or less, and N: 0.030% or more and less than 0.20%, with the balance consisting of Fe and inevitable impurities.

First claim

1 . A martensitic stainless steel comprising a chemical composition containing, by mass %,
C: 0.030% or more and less than 0.20%, Si: 0.01% or more and 2.0% or less, Mn: 0.01% or more and 3.0% or less, P: 0.050% or less, S: 0.010% or less, Cr: 10.0% or more and 16.0% or less, Ni: 0.01% or more and 0.80% or less, Al: 0.001% or more and 0.50% or less, Zr: 0.005% or more and 0.50% or less, and N: 0.030% or more and less than 0.20%,
with the balance consisting of Fe and inevitable impurities.

2 . The martensitic stainless steel sheet according to claim 1 , wherein the chemical composition further contains, by mass %, at least one selected from the group consisting of
Cu: 0.01% or more and 3.0% or less, Mo: 0.01% or more and 0.50% or less, and Co: 0.01% or more and 0.50% or less.

3 . The martensitic stainless steel sheet according to claim 1 , wherein the chemical composition further contains, by mass %, at least one selected from the group consisting of
Ti: 0.001% or more and 0.50% or less, Nb: 0.001% or more and 0.50% or less, and V: 0.001% or more and 0.50% or less.

4 . The martensitic stainless steel sheet according to claim 1 , wherein the chemical composition further contains, by mass %, at least one selected from the group consisting of
B: 0.0002% or more and 0.0100% or less, Ca: 0.0002% or more and 0.0100% or less, and Mg: 0.0002% or more and 0.0100% or less.

5 . The martensitic stainless steel sheet according to claim 1 , having a tensile strength of 1300 MPa or more, an elongation of 7.0% or more, and an ultimate deformability of 0.5 or more.

6 . The martensitic stainless steel sheet according to claim 2 , wherein the chemical composition further contains, by mass %, at least one selected from the group consisting of
Ti: 0.001% or more and 0.50% or less, Nb: 0.001% or more and 0.50% or less, and V: 0.001% or more and 0.50% or less.

7 . The martensitic stainless steel sheet according to claim 2 , wherein the chemical composition further contains, by mass %, at least one selected from the group consisting of
B: 0.0002% or more and 0.0100% or less, Ca: 0.0002% or more and 0.0100% or less, and Mg: 0.0002% or more and 0.0100% or less.

8 . The martensitic stainless steel sheet according to claim 3 , wherein the chemical composition further contains, by mass %, at least one selected from the group consisting of
B: 0.0002% or more and 0.0100% or less, Ca: 0.0002% or more and 0.0100% or less, and Mg: 0.0002% or more and 0.0100% or less.

9 . The martensitic stainless steel sheet according to claim 6 , wherein the chemical composition further contains, by mass %, at least one selected from the group consisting of
B: 0.0002% or more and 0.0100% or less, Ca: 0.0002% or more and 0.0100% or less, and Mg: 0.0002% or more and 0.0100% or less.

10 . The martensitic stainless steel sheet according to claim 2 , having a tensile strength of 1300 MPa or more, an elongation of 7.0% or more, and an ultimate deformability of 0.5 or more.

11 . The martensitic stainless steel sheet according to claim 3 , having a tensile strength of 1300 MPa or more, an elongation of 7.0% or more, and an ultimate deformability of 0.5 or more.

12 . The martensitic stainless steel sheet according to claim 4 , having a tensile strength of 1300 MPa or more, an elongation of 7.0% or more, and an ultimate deformability of 0.5 or more.

13 . The martensitic stainless steel sheet according to claim 6 , having a tensile strength of 1300 MPa or more, an elongation of 7.0% or more, and an ultimate deformability of 0.5 or more.

14 . The martensitic stainless steel sheet according to claim 7 , having a tensile strength of 1300 MPa or more, an elongation of 7.0% or more, and an ultimate deformability of 0.5 or more.

15 . The martensitic stainless steel sheet according to claim 8 , having a tensile strength of 1300 MPa or more, an elongation of 7.0% or more, and an ultimate deformability of 0.5 or more.

16 . The martensitic stainless steel sheet according to claim 9 , having a tensile strength of 1300 MPa or more, an elongation of 7.0% or more, and an ultimate deformability of 0.5 or more.

Assignees

• Jfe Steel Corp

Inventors

• Nakamura Tetsuyuki
• Ishikawa Shin
• Kami Chikara

Classifications

• C21D8/02

  during manufacturing of plates or strips (C21D8/12 takes precedence) · CPC title

• C21D8/0226

  Hot rolling · CPC title

• C21D9/46 Primary

  for sheet metals · CPC title

• C22C38/54

  with boron · CPC title

• C22C38/52

  with cobalt · CPC title