US2026062774A1PendingUtilityA1
Steel material and automobile component
Est. expirySep 2, 2042(~16.1 yrs left)· nominal 20-yr term from priority
Inventors:KAMIO HIROSHI
C22C 38/02C21D 2211/001C21D 8/0273C21D 8/0236C21D 8/0226C21D 8/02C21D 6/001C21D 8/00C21D 6/008C22C 38/004C22C 38/12C22C 38/002C22C 38/007C22C 38/008C22C 38/54C22C 38/16C22C 38/34C22C 38/04C22C 38/06C22C 38/08C21D 6/005C22C 38/60C21D 6/00C21D 9/46
63
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Claims
Abstract
A steel material that has an average chemical composition containing Ni at 18.00 to 36.00% and Si at 5.50 to 12.00%, and has a metallurgical structure containing an austenite phase and ordered phases. In addition, an automobile component including the steel material.
Claims
exact text as granted — not AI-modified1 . A steel material comprising an average chemical composition including, by mass %:
Ni at 18.00 to 36.00%, Si at 5.50 to 12.00%, Cu at 0 to 2.00%, Al at 0 to 3.000%, Mn at 0 to 2.00%, C at 0 to 0.100%, Cr at 0 to 0.40% P at 0 to 0.200%, S at 0 to 0.200%, N at 0 to 0.200%, B at 0 to 0.200%, Sn at 0 to 0.20%, Ge at 0 to 0.20%, Ag at 0 to 0.20%, Sb at 0 to 0.20%, Te at 0 to 0.20%, V at 0 to 0.200%, Nb at 0 to 0.200%, Ti at 0 to 0.200%, Ca at 0 to 0.200%, Mg at 0 to 0.200%, Li at 0 to 0.20%, Sr at 0 to 0.20%, REM at 0 to 0.20%, Zr at 0 to 0.20%, Co at 0 to 0.20%, Mo at 0 to 0.20%, Ta at 0 to 0.20%, W at 0 to 0.20%, PGM at 0 to 0.20%, Au at 0 to 0.20%, Re at 0 to 0.20%, In at 0 to 0.20%, Ga at 0 to 0.20%, Cd at 0 to 0.20%, Pb at 0 to 0.20%, with a balance being Fe and impurities, wherein the steel material has a metallographic structure containing an austenite phase and ordered phases.
2 . The steel material according to claim 1 , wherein the average chemical composition of the steel material satisfies the following Formula A:
C
+
Mn
/
6
+
Si
/
24
+
Ni
/
40
+
Cr
/
5
≤
1.4
Formula
A
wherein, in Formula A, each element symbol represents an amount (mass %) of the element.
3 . The steel material according to claim 1 , wherein an average area ratio of the austenite phase is in a range of from 20 to 80%.
4 . The steel material according to claim 1 , wherein the ordered phases contain a DO3 ordered phase, and wherein a ratio of the DO3 ordered phase to all the ordered phases ([DO3 ordered phase]/[all the ordered phases]), as determined by X-ray diffractometry, satisfies the following Formula B:
Formula
B
:
[
DO
3
ordered
phase
]
/
[
all
the
ordered
phases
]
≥
0.2
.
5 . The steel material according to claim 1 , wherein the average chemical composition of the ordered phases satisfies the following Formula C:
(
Si
ordered
+
Al
ordered
)
/
(
Ni
ordered
+
Cu
ordered
)
≥
0.25
,
Formula
C
wherein, in Formula C, each element symbol, followed by a subscript ordered , represents an amount (mass %) of the element contained in the ordered phases.
6 . The steel material according to claim 1 , wherein the average chemical composition of the austenite phase satisfies the following Formula D:
Ni
γ
+
0.65
Cr
y
+
1.1
Mn
γ
+
0.4
Si
γ
+
13
C
γ
≥
18.4
,
Formula
D
wherein, in Formula D, each element symbol, followed by a subscript γ , represents an amount (mass %) of the element contained in the austenite phase.
7 . The steel material according to claim 1 , wherein an average crystal grain size of the ordered phases is 10.00 μm or less.
8 . The steel material according to claim 1 , wherein the ordered phases include an antiphase boundary.
9 . The steel material according to claim 1 , having a tensile strength and a total elongation that give a product of 30000 MPa % or more.
10 . The steel material according to claim 1 , wherein the tensile strength is 1250 MPa or more.
11 . An automobile component comprising the steel material according to claim 1 .Join the waitlist — get patent alerts
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