Stainless steel sheet

Patent metadata

Field	Value
Publication number	US-2016281189-A1
Application number	US-201414778291-A
Country	US
Kind code	A1
Filing date	Mar 13, 2014
Priority date	Mar 19, 2013
Publication date	Sep 29, 2016
Grant date	—

Abstract

A stainless steel sheet having excellent formability which makes it possible to manufacture brake disks for automobiles by performing severe forming. The stainless steel sheet having a chemical composition comprising, by mass %, C: 0.015% or more and less than 0.100%, Si: 0.01% or more and 1.00% or less, Mn: 0.01% or more and 2.00% or less, P: 0.040% or less, S: 0.030% or less, Cr: 10.0% or more and less than 14.0%, Ni: 0.01% or more and 0.70% or less, Al: 0.001% or more and 0.200% or less, N: 0.005% or more and 0.080% or less, O: 0.0060% or less, B: 0.0002% or more and 0.0030% or less, V: (10×B content (%))% or more and 0.300% or less, and Fe and unavoidable impurities as a balance.

First claim

1 . A stainless steel sheet having a martensite structure formed by performing quenching, the steel sheet having a chemical composition comprising:
C: 0.015% or more and less than 0.100%, by mass %; Si: 0.01% or more and 1.00% or less, by mass %; Mn: 0.01% or more and 2.00% or less, by mass %; P: 0.040% or less, by mass %; S: 0.030% or less, by mass %; Cr: 10.0% or more and less than 14.0%, by mass %; Ni: 0.01% or more and 0.70% or less, by mass %; Al: 0.001% or more and 0.200% or less, by mass %; N: 0.005% or more and 0.080% or less, by mass %; O: 0.0060% or less, by mass %; B: 0.0002% or more and 0.0030% or less, by mass %; V: (10×B content (%))% or more and 0.300% or less, and remaining Fe and unavoidable impurities as a balance.

2 . The stainless steel sheet according to claim 1 , wherein V: (20×B content (%))% or more and 0.200% or less, by mass %.

3 . The stainless steel sheet according to claim 1 , wherein V: (20×B content (%))% or more and 0.050% or less, by mass %.

4 . The stainless steel sheet according to claim 1 , the chemical composition further comprising at least one group selected from the groups A to C consisting of:
A: at least one selected from the group consisting of Nb: 0.01% or more and 0.40% or less, by mass %, and Ti: 0.01% or more and 0.40% or less, by mass %; Group B: at least one selected from the group consisting of Mo: 0.01% or more and 0.30% or less, by mass %, Cu: 0.01% or more and 1.20% or less, by mass %, and Co: 0.01% or more and 0.20% or less, by mass %; and Group C: Ca: 0.0003% or more and 0.0030% or less, by mass %.

5 . The stainless steel sheet according to claim 2 , the chemical composition further comprising at least one group selected from the groups A to C consisting of:
Group A: at least one selected from the group consisting of Nb: 0.01% or more and 0.40% or less, by mass %, and Ti: 0.01% or more and 0.40% or less, by mass %; Group B: at least one selected from the group consisting of Mo: 0.01% or more and 0.30% or less, by mass %, Cu: 0.01% or more and 1.20% or less, by mass %, and Co: 0.01% or more and 0.20% or less, by mass %; and Group C: Ca: 0.0003% or more and 0.0030% or less, by mass %.

6 . The stainless steel sheet according to claim 3 , the chemical composition further comprising at least one group selected from e groups A to C consisting of:
Group A: at least one selected from the group consisting of Nb: 0.01% or more and 0.40% or less, by mass %, and Ti: 0.01% or more and 0.40% or less, by mass %; Group B: at least one selected from the group consisting of Mo: 0.01% or more and 0.30% or less, by mass %, Cu: 0.01% or more and 1.20% or less, by mass %, and Co: 0.01% or more and 0.20% or less by mass %; and Group C: Ca: 0.0003% or more and 0.0030% or less, by mass %.

7 . The stainless steel sheet according to claim 1 , wherein the steel sheet has a hardness in the range of 20 to 45 HRC (Rockwell Hardness C-Scale).

8 . The stainless steel sheet according to claim 1 , wherein the steel sheet has a Lankford coefficient (r value) in the range of 1.0 or more.

9 . The stainless steel sheet according to claim 1 , wherein the steel sheet has a hole expansion ratio (λ) in the range of 140% or more.

Assignees

• Jfe Steel Corp

Inventors

• Fujisawa Mitsuyuki
• Ota Hiroki
• Ogata Hiroyuki

Classifications

• C22C38/02

  containing silicon · CPC title

• C22C38/001

  containing N · CPC title

• C22C38/54

  with boron · CPC title

• C22C38/46

  with vanadium · CPC title

• C21D2211/008

  Martensite · CPC title