US2025290182A1PendingUtilityA1
Martensitic stainless alloy
Est. expiryJun 5, 2039(~12.8 yrs left)· nominal 20-yr term from priority
C21D 8/02C21D 2211/004C22C 38/001C22C 38/20C22C 38/22C22C 38/44C22C 38/04C22C 38/02C22C 38/002C21D 2211/008C21D 9/52C21D 8/0263C21D 8/0236C21D 8/0226C21D 6/008C21D 6/005C21D 6/004C21D 8/021C21D 8/0273C21D 8/0268C21D 6/04C21D 2261/00C21D 1/26C21D 1/25C22C 38/46C22C 38/42C22C 38/24C21D 9/46C21D 6/02C21D 6/002C21D 1/18C21D 8/0205
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Claims
Abstract
A martensitic stainless alloy comprising, in percent by weight (wt. %): C>0.50 to 0.60; Si 0.10 to 0.60; Mn 0.40 to 0.80; Cr 13.50 to 14.50; Ni 0 to 1.20; Mo 0.80 to 2.50; N 0.050 to 0.12; Cu 0.10 to 1.50; V max 0.10; S max 0.03; P max 0.03; the balance being Fe and unavoidable impurities.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A martensitic stainless alloy comprising, in percent by weight (wt. %):
C
>0.50 to 0.60;
Si
0.10 to 0.60,
Mn
0.40 to 0.80;
Cr
13.50 to 14.50;
Ni
0 to 1.20;
Mo
0.80 to 2.50;
N
0.050 to 0.12;
Cu
more than 0.4 to 1.50;
V
max 0.10;
S
max 0.03;
P
max 0.03;
the balance being Fe and unavoidable impurities,
wherein a microstructure of the martensitic stainless alloy includes a plurality of particles selected from the group consisting of metal carbonitrides; M 23 C 6 and M 7 C 3 carbides; and carbides of other types, where M represents one or more metallic atoms, and
wherein a particle area fraction is 4.1 to 5.0%, and a volume fraction of particles having a diameter above 0.70 μm is 6-15%.
2 . The martensitic stainless alloy according to claim 1 , wherein the metallic atoms include Cr and Mo.
3 . The martensitic stainless alloy according to claim 1 , wherein the microstructure includes Cu precipitates.
4 . The martensitic stainless alloy according to claim 1 , wherein the metallic atoms include Cr and Mo, and wherein the microstructure includes Cu precipitates.
5 . The martensitic stainless alloy according to claim 1 , wherein:
Si is 0.20 to 0.55 wt. %, Mn is 0.50 to 0.80 wt. %, Mo is 0.80 to 2.00 wt. %, Ni is <0.80 wt. %, N is 0.050 to 0.10 wt. %, V is 0.030 to 0.10 wt. %, C is 0.51 to 0.60 wt. %, and Cu is 0.50 to 1.5 wt. %.
6 . The martensitic stainless alloy according to claim 5 , wherein the metallic atoms include Cr and Mo, and wherein the microstructure includes Cu precipitates.
7 . A stainless steel object comprising the martensitic stainless alloy according to claim 1 , wherein the object is a strip.
8 . The stainless steel object according to claim 7 , wherein said object is cold rolled, hardened and tempered.
9 . The stainless steel object according to claim 7 , wherein said object is cold rolled to final thicknesses of 0.040 to 3 mm.
10 . An object, comprising:
a body formed of a martensitic stainless alloy, the martensitic stainless alloy having a composition including, in percent by weight (wt. %):
C
>0.50 to 0.60;
Si
0.10 to 0.60,
Mn
0.40 to 0.80;
Cr
13.50 to 14.50;
Ni
0 to 1.20;
Mo
0.80 to 2.50;
N
0.050 to 0.12;
Cu
more than 0.4 to 1.50;
V
max 0.10;
S
max 0.03;
P
max 0.03;
the balance being Fe and unavoidable impurities,
wherein a microstructure of the martensitic stainless alloy includes a plurality of particles selected from the group consisting of metal carbonitrides; M 23 C 6 and M 7 C 3 carbides; and carbides of other types, where M represents one or more metallic atoms, and
wherein a particle area fraction is 4.1 to 5.0%, and a volume fraction of particles having a diameter above 0.70 μm is 6-15%.
11 . The object according to claim 10 , wherein the metallic atoms include Cr and Mo.
12 . The object according to claim 10 , wherein the microstructure includes Cu precipitates.
13 . The object according to claim 10 , wherein the metallic atoms include Cr and Mo, and wherein the microstructure includes Cu precipitates.
14 . The object according to claim 10 , wherein, in the composition:
Si is 0.20 to 0.55 wt. %, Mn is 0.50 to 0.80 wt. %, Mo is 0.80 to 2.00 wt. %, Ni is <0.80 wt. %, N is 0.050 to 0.10 wt. %, V is 0.030 to 0.10 wt. %, C is 0.51 to 0.60 wt. %, and Cu is 0.50 to 1.5 wt. %.
15 . The object according to claim 14 , wherein the metallic atoms include Cr and Mo, and wherein the microstructure includes Cu precipitates.
16 . The object according to claim 10 , wherein the composition includes, in percent by weight (wt. %):
C
0.51 to 0.56;
Si
0.30 to 0.50;
Mn
0.60 to 0.80;
Cr
13.50 to 14.50;
Ni
0 to 0.80;
Mo
0.90 to 1.30;
N
0.050 to 0.090;
Cu
more than 0.4 to 1.50;
V
0.030 to 0.10;
S
max 0.03;
P
max 0.03;
the balance being Fe and less than or equal
to 0.5 wt.% unavoidable impurities.
17 . The object according to claim 16 , wherein the metallic atoms include Cr and Mo, and wherein the microstructure includes Cu precipitates.
18 . The object according to claim 10 , wherein said object is a flapper valve for a compressor.
19 . The object according to claim 18 , wherein said object is cold rolled, hardened and tempered.
20 . The object according to claim 18 , wherein said object is cold rolled to final thicknesses of 0.040 to 3 mm.Join the waitlist — get patent alerts
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