HIGH-STRENGTH STEEL MEMBER
First Claim
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1. A high-strength steel member having a chemical composition of, in terms of percent (%) by mass:
- C;
from 0.10 to 0.50%,Si;
from 0.02 to 2.00%,Mn;
from 0.05 to 2.00%,Cr;
from 0.10 to 2.00%,Ti;
from 0.20 to 1.00%,N;
from 0.0020 to 0.0250%,Al;
from 0 to 0.100%,V;
from 0 to 0.50%,Nb;
from 0 to 0.50%,Mo;
from 0 to 1.00%,B;
from 0 to 0.0100%,Cu;
from 0 to 2.00%,Ni;
from 0 to 3.00%, anda balance consisting of Fe and impurities,having a tensile strength of 1,000 MPa or higher,containing 0.10% or more of, in terms of percent (%) by area, at least one Ti precipitate that has an average size of from 30 to 200 nm in terms of an average equivalent circle diameter and is selected from the group consisting of a Ti carbide, a Ti nitride, and a composite compound thereof, at a location of 1 mm in depth from a surface of the steel member, andcontaining 0.5 ppm by mass or more of non-diffusible hydrogen that is released in a temperature range of from 400 to 800°
C. in a thermal desorption hydrogen analysis.
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Abstract
A high-strength steel member having a predetermined chemical composition, having a tensile strength of 1,000 MPa or higher, containing 0.10% or more of, in terms of percent (%) by area, at least one Ti precipitate that has an average size of from 30 to 200 nm in terms of an average equivalent circle diameter and is selected from the group consisting of a Ti carbide, a Ti nitride, and a composite compound thereof, at a location of 1 mm in depth from a surface of the steel member, and containing 0.5 ppm by mass or more of non-diffusible hydrogen that is released in a temperature range of from 400 to 800° C. in a thermal desorption hydrogen analysis.
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Citations
12 Claims
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1. A high-strength steel member having a chemical composition of, in terms of percent (%) by mass:
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C;
from 0.10 to 0.50%,Si;
from 0.02 to 2.00%,Mn;
from 0.05 to 2.00%,Cr;
from 0.10 to 2.00%,Ti;
from 0.20 to 1.00%,N;
from 0.0020 to 0.0250%,Al;
from 0 to 0.100%,V;
from 0 to 0.50%,Nb;
from 0 to 0.50%,Mo;
from 0 to 1.00%,B;
from 0 to 0.0100%,Cu;
from 0 to 2.00%,Ni;
from 0 to 3.00%, anda balance consisting of Fe and impurities, having a tensile strength of 1,000 MPa or higher, containing 0.10% or more of, in terms of percent (%) by area, at least one Ti precipitate that has an average size of from 30 to 200 nm in terms of an average equivalent circle diameter and is selected from the group consisting of a Ti carbide, a Ti nitride, and a composite compound thereof, at a location of 1 mm in depth from a surface of the steel member, and containing 0.5 ppm by mass or more of non-diffusible hydrogen that is released in a temperature range of from 400 to 800°
C. in a thermal desorption hydrogen analysis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A high-strength steel member comprising a chemical composition, in terms of percent (%) by mass:
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C;
from 0.10 to 0.50%,Si;
from 0.02 to 2.00%,Mn;
from 0.05 to 2.00%,Cr;
from 0.10 to 2.00%,Ti;
from 0.20 to 1.00%,N;
from 0.0020 to 0.0250%,Al;
from 0 to 0.100%,V;
from 0 to 0.50%,Nb;
from 0 to 0.50%,Mo;
from 0 to 1.00%,B;
from 0 to 0.0100%,Cu;
from 0 to 2.00%,Ni;
from 0 to 3.00%, anda balance comprising Fe and impurities, having a tensile strength of 1,000 MPa or higher, containing 0.10% or more of, in terms of percent (%) by area, at least one Ti precipitate that has an average size of from 30 to 200 nm in terms of an average equivalent circle diameter and is selected from the group consisting of a Ti carbide, a Ti nitride, and a composite compound thereof, at a location of 1 mm in depth from a surface of the steel member, and containing 0.5 ppm by mass or more of non-diffusible hydrogen that is released in a temperature range of from 400 to 800°
C. in a thermal desorption hydrogen analysis.
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Specification
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Current AssigneeNippon Steel Corporation
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Original AssigneeNippon Steel Corporation
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InventorsYAMASAKI, Shingo, MANABE, Toshiyuki
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Application NumberUS16/624,122Publication NumberTime in Patent OfficeDaysField of SearchUS Class CurrentCPC Class CodesC21D 1/06 Surface hardeningC21D 6/002 containing Cr C21D6/004 tak...C21D 6/005 containing MnC21D 6/008 containing SiC21D 8/06 during manufacturing of rod...C21D 8/065 of ferrous alloysC22C 38/001 containing NC22C 38/004 Very low carbon steels, i.e...C22C 38/02 containing siliconC22C 38/04 containing manganeseC22C 38/06 containing aluminiumC22C 38/20 with copperC22C 38/22 with molybdenum or tungstenC22C 38/24 with vanadiumC22C 38/26 with niobium or tantalumC22C 38/28 with titanium or zirconiumC22C 38/32 with boronC22C 38/38 with more than 1.5% by weig...C22C 38/50 with titanium or zirconiumC22C 38/58 with more than 1.5% by weig...
