Quench and temper corrosion resistant steel alloy
Abstract
A quench and temper steel alloy is disclosed having the following composition in weight percent. C 0.2-0.5 Mn 0.1-1.0 Si 0.1-1.2 Cr 9-14.5 Ni 3.0-5.5 Mo 1-2 Cu 0-1.0 Co 1-4 W 0.2 max. V 0.1-1.0 Ti up to 0.5 Nb 0-0.5 Ta 0-0.5 Al 0-0.25 Ce 0-0.01 La 0-0.01 The balance of the alloy is iron and the usual impurities including not more than about 0.01% phosphorus, not more than about 0.010% sulfur, and not more than about 0.10% nitrogen. A quenched and tempered steel article made from this alloy is also disclosed. The steel article is characterized by a tensile strength of at least about 290 ksi, a fracture toughness (K Ic ) of at least about 65 ksi, good resistance to general corrosion, and good resistance to pitting corrosion.
Claims
exact text as granted — not AI-modified1 . A steel alloy comprising, in weight percent, about:
C
0.2-0.5
Mn
0.1-1.0
Si
0.1-1.2
Cr
9-14.5
Ni
3.0-5.5
Mo
1-2
Cu
up to 1.0
Co
1-4
V
0.1-1.0
Ti
up to 0.5
Al
0-0.25
the balance of the alloy is iron and usual impurities including not more than about 0.01% phosphorus, not more than about 0.001% sulfur, and not more than about 0.10% nitrogen.
2 . The alloy set forth in claim 1 which contains up to about 0.5% niobium and/or tantalum.
3 . The alloy as set forth in claim 2 which contains up to about 0.01% cerium and up to about 0.01% lanthanum.
4 . The alloy as set forth in claim 1 which contains not more than about 0.05% nitrogen.
5 . The alloy set forth in claim 1 which contains about 9.5-12.5% chromium.
6 . The alloy set forth in claim 1 which contains about 1.25-1.75% molybdenum.
7 . The alloy set forth in claim 1 which contains about 2-3% cobalt.
8 . The alloy set forth in claim 1 which contains about 3.2-4.3% nickel.
9 . The alloy as set forth in claim 1 which contains at least about 0.3% vanadium.
10 . The alloy as set forth in claim 1 which contains at least about 0.01% titanium.
11 . The alloy as set forth in claim 1 which contains at least about 0.1% copper.
12 . The alloy as set forth in claim 11 which contains not more than about 0.7% copper.
13 . The alloy as set forth in claim 1 which contains not more than about 0.01% copper and at least about 3.75% nickel.
14 . The alloy as set forth in claim 13 which contains not more than about 4.0% nickel.
15 . A steel alloy consisting essentially of, in weight percent, about
C
0.35-0.45
Mn
0.1-0.7
Si
0.1-1.0
Cr
9.5-12.5
Ni
3.2-4.3
Mo
1.25-1.75
Cu
0.1-1.0
Co
2-3
W
up to 0.05
V
0.3-0.6
Ti
0.01-0.2
Nb
up to 0.01
Ta
up to 0.01
Al
0.01 max.
Ce
0-0.006
La
0-0.005
and the balance is iron and the usual impurities including not more than about 0.005% phosphorus, not more than about 0.001% sulfur, and not more than about 0.03% nitrogen.
16 . The alloy as set forth in claim 15 which contains not more than about 0.7% copper.
17 . The alloy as set forth in claim 15 which contains at least about 0.3% copper.
18 . A quenched and tempered steel article made from the alloy set forth in claim 1 which has a tensile strength of at least 290 ksi.
19 . The steel article set forth in claim 18 which has a fracture toughness (K Ic ) of at least about 65 ksi√in when tested in accordance with ASTM Standard Test Procedure E1290.
20 . The steel article set forth in claim 19 which has sufficient general corrosion resistance such that the article does not rust after 200 hours when tested in accordance with ASTM Standard Test procedure B 117.
21 . The steel article as set forth in claim 19 which has sufficient pitting corrosion resistance such that the article has a pitting potential of at least 90 mV when tested in accordance with ASTM Standard Test procedure G61 modified by using round bar samples.
22 . A structural component for an aerospace vehicle wherein the component is made from an alloy consisting essentially of, in weight percent, about
C
0.35-0.45
Mn
0.1-0.7
Si
0.1-1.0
Cr
9.5-12.5
Ni
3.2-4.3
Mo
1.25-1.75
Cu
0.1-0.7
Co
2-3
W
0.1 max.
V
0.3-0.6
Ti
0.01-0.2
Nb
0.01 max.
Ta
0.01 max.
Al
0.01 max.
Ce
0-0.006
La
0-0.005
and the balance is iron and the usual impurities including not more than about 0.005% phosphorus, not more than about 0.0005% sulfur, and not more than about 0.03% nitrogen.
23 . The aerospace structural component as set forth in claim 22 wherein the component is selected from the group consisting of one or more of landing gear, a rotatable shaft, an actuator, flap tracks, and slat tracks.Join the waitlist — get patent alerts
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