Patent US3810698A successfully refreshed from Google Patents.
Patent US5601664A successfully refreshed from Google Patents.
US5601664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion-resistant magnetic material
Assignee: CRS Holdings LLC
•
Filing: 1995-11-08
•
Granted: 1997-02-11
•
Expires: 2015-11-08
Abstract
Abstract A ferritic, stainless steel alloy containing in weight percent about 0.05% max. C, 2.0% max. Mn, 0.70-1.5% Si, 0.1-0.5% S, 15-20% Or, 0.80-3.00% Mo, 0.10-1.0% Nb, 0.06% max. N, and the balance iron and impurities, provides a unique combination of magnetic properties, corrosion resistance, and machinability.
Inventors
- 👤 Theodore Kosa
- 👤 Stephen M. Lukes
- 👤 Douglas W. Dietrich
- 👤 Terry A. DeBold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:51
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/22; C22C38/26; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14766
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
108 words
A free-machining, corrosion resistant, ferritic steel alloy consisting essentially of, in weight percent, about: ______________________________________
C 0.05 max.
Mn 0.1-2.0
Si 0.70-1.5
P 0.035 max.
S 0.1-0.5
Cr 15-20
Mo 1.00-3.00
Ti 0.02 max.
Al 0.05 max.
Nb 0.1-0.6
Ni 0.2-0.6
Cu 0.25 max.
N 0.06 max.
______________________________________ and the balance is essentially iron, wherein Cr, Mo, and Nb are balanced such that the alloy contains at least about 1.5% Mo when less than about 0.35% Nb and less than about 18% Cr are present, and the elements C, N, and Nb are balanced within their respective weight percent ranges such that the ratio, Nb/(C+N), is about 7-12.
Claim 2
Dependent Claim
108 words
A free-machining, corrosion resistant, ferritic steel alloy consisting essentially of, in weight percent, about: ______________________________________
C 0.05 max.
Mn 0.1-2.0
Si 0.70-1.5
P 0.035 max.
S 0.1-0.5
Cr 15-20
Mo 1.00-3.00
Ti 0.02 max.
Al 0.05 max.
Nb 0.1-0.6
Ni 0.2-0.6
Cu 0.25 max.
N 0.06 max.
______________________________________ and the balance is essentially iron, wherein Cr, Mo, and Nb are balanced such that the alloy contains at least about 1.5% Mo when less than about 0.35% Nb and less than about 18% Cr are present, and the elements C, N, and Nb are balanced within their respective weight percent ranges such that the ratio, Nb/(C+N), is about 7-12.
Claim 3
Dependent Claim
13 words
An alloy as recited in claim 1 containing at least about 1.5% molybdenum.
Claim 4
Dependent Claim
14 words
An alloy as recited in claim 1 containing not more than about 2.50% molybdenum.
Claim 5
Dependent Claim
13 words
An alloy as recited in claim 1 containing at least about 0.90% silicon.
Claim 6
Dependent Claim
13 words
An alloy as recited in claim 1 containing at least about 1.00% silicon.
Claim 7
Dependent Claim
107 words
A free-machining, corrosion resistant, ferritic alloy consisting essentially of, in weight percent, about: ______________________________________
C 0.03 max.
Mn 0.1-1.0
Si 0.8-1.4
P 0.025 max.
S 0.2-0.4
Cr 16-19
Mo 1.00-2.50
Ti 0.02 max.
Al 0.05 max.
Nb 0.20-0.60
Ni 0.2-0.6
Cu 0.25 max.
N 0.05 max.
______________________________________ and the balance is essentially iron, wherein the elements Cr, Mo, and Nb are balanced such that the alloy contains at least about 1.5% Mo when less than about 0.35% Nb and less than about 18% Cr are present, and C, N, and Nb are balanced within their respective weight percent ranges such that the ratio, Nb/(C+N) is about 7-12.
Claim 8
Dependent Claim
107 words
A free-machining, corrosion resistant, ferritic alloy consisting essentially of, in weight percent, about: ______________________________________
C 0.03 max.
Mn 0.1-1.0
Si 0.8-1.4
P 0.025 max.
S 0.2-0.4
Cr 16-19
Mo 1.00-2.50
Ti 0.02 max.
Al 0.05 max.
Nb 0.20-0.60
Ni 0.2-0.6
Cu 0.25 max.
N 0.05 max.
______________________________________ and the balance is essentially iron, wherein the elements Cr, Mo, and Nb are balanced such that the alloy contains at least about 1.5% Mo when less than about 0.35% Nb and less than about 18% Cr are present, and C, N, and Nb are balanced within their respective weight percent ranges such that the ratio, Nb/(C+N) is about 7-12.
Claim 9
Dependent Claim
13 words
An alloy as recited in claim 6 containing at least about 1.50% molybdenum.
Claim 10
Dependent Claim
14 words
An alloy as recited in claim 7, containing not more than about 2.00% molybdenum.
Claim 11
Dependent Claim
13 words
An alloy as recited in claim 6, containing at least about 1.00% silicon.
Claim 12
Dependent Claim
14 words
An alloy as recited in claim 9, containing not more than about 18% chromium.
Claim 13
Dependent Claim
76 words
A free-machining, corrosion resistant, ferritic alloy consisting essentially of, in weight percent, about: ______________________________________
C 0.020 max.
Mn 0.2-0.6
Si 0.8-1.2
P 0.020 max.
S 0.25-0.35
Cr 17-18
Mo 1.50-3.00
Ti 0.01 max.
Al 0.05 max.
Nb 0.20-0.60
Ni 0.2-0.4
Cu 0.15 max.
N 0.030 max.
______________________________________ and the balance is essentially iron, wherein the elements C, N, and Nb are balanced within their respective weight percent ranges such that the ratio, Nb/(C+N) is about 7-12.
Claim 14
Dependent Claim
76 words
A free-machining, corrosion resistant, ferritic alloy consisting essentially of, in weight percent, about: ______________________________________
C 0.020 max.
Mn 0.2-0.6
Si 0.8-1.2
P 0.020 max.
S 0.25-0.35
Cr 17-18
Mo 1.50-3.00
Ti 0.01 max.
Al 0.05 max.
Nb 0.20-0.60
Ni 0.2-0.4
Cu 0.15 max.
N 0.030 max.
______________________________________ and the balance is essentially iron, wherein the elements C, N, and Nb are balanced within their respective weight percent ranges such that the ratio, Nb/(C+N) is about 7-12.
Claim 15
Dependent Claim
13 words
An alloy as recited in claim 2 containing at least about 0.2% niobium.
References Cited (Backward Citations)
US2897078A
Cited
US3615367A
Cited
US3926685A
Cited
US3713812A
Cited
GB1519313A
Cited
US4059440A
Cited
US4264356A
Cited
US4465525A
Cited
US4360381A
Cited
JPS5754252A
Cited
US4477280A
Cited
US4652428A
Cited
US4957701A
Cited
US4799972A
Cited
US4726853A
Cited
US4969963A
Cited
US5069870A
Cited
EP0422574A1
Cited
EP0435003A1
Cited
US5110544A
Cited
US5302214A
Cited
JPH0483857A
Cited
US5190722A
Cited
US5202088A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-02-11 | 2000-08-12 | 2001-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-11 | 2004-08-12 | 2005-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-11 | 2008-08-12 | 2009-02-11 | $7700.00 | Window Closed / Lapsed |