US3904401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion resistant austenitic stainless steel
Assignee: Carpenter Technology Corp
•
Filing: 1974-03-21
•
Granted: 1975-09-09
•
Expires: 1994-03-21
Abstract
Abstract An austenitic stainless steel containing 0.25 percent Max. carbon, 15-20 percent manganese, 1% Max. silicon, 16-22 percent chromium, 3 percent Max. nickel, 0.5-3 percent molybdenum, 0.5-2 percent copper, 0.2-0.8 percent nitrogen, and the balance iron which in its annealed condition is substantially fully austenitic and is capable of an ultimate tensile strength in its annealed condition of about 125 ksi, and which can be cold worked to strength levels in excess of 200 ksi in which condition it is substantially fully austenitic and nonmagnetic.
Inventors
- 👤 David L Mertz
- 👤 Robert L Caton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:05
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/02; C22C38/001; C22C38/18; C22C38/22; C22C38/38; C22C38/40; C22C38/42; C22C38/44; C22C38/58; C22C38/60
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
31 words
A CORROSION RESISTANT AUSTENITIC STAINLESS STEEL ALLOY WHICH IS SUBSTANTIALLY FULLY AUSTENIC AND NOMAGNETIC IN ITS ANNEALED CONDITION AND IN ITS COLD WORKED CONDITION, CONSISTING ESSENTIALLY IN WEIGHT PERCENT OF ABOUT
Claim 2
Dependent Claim
31 words
A CORROSION RESISTANT AUSTENITIC STAINLESS STEEL ALLOY WHICH IS SUBSTANTIALLY FULLY AUSTENIC AND NOMAGNETIC IN ITS ANNEALED CONDITION AND IN ITS COLD WORKED CONDITION, CONSISTING ESSENTIALLY IN WEIGHT PERCENT OF ABOUT
Claim 3
Dependent Claim
32 words
The alloy as set forth in claim 1, in which copper is limited to no more than about 1 percent when the amount of manganese present is greater than about 18 percent.
Claim 4
Dependent Claim
13 words
The alloy as set forth in claim 1 containing about 0.4-0.65 percent nitrogen.
Claim 5
Dependent Claim
13 words
The alloy as set forth in claim 3 containing about 16-19 percent manganese.
Claim 6
Dependent Claim
13 words
The alloy as set forth in claim 4 containing about 17-19 percent chromium.
Claim 7
Dependent Claim
35 words
The alloy as set forth in claim 5 containing about 0.05-0.15 percent carbon, no more than about 1 percent nickel, no more than about 1.5 percent molybdenum, and no more than about 1.5 percent copper.
Claim 8
Dependent Claim
25 words
The alloy as set forth in claim 6 containing no more than about 1 percent copper when the amount of manganese exceeds about 18 percent.
Claim 9
Dependent Claim
16 words
The alloy as set forth in claim 7 containing no more than about 0.55 percent nitrogen.
Claim 10
Dependent Claim
46 words
A corrosion resistant austenitic stainless steel alloy which is substantially fully austenitic and nonmagnetic in its annealed condition and which has a room temperature ultimate tensile strength of at least about 120,000 psi in its annealed condition, said alloy consisting essentially in weight percent of about
Claim 11
Dependent Claim
46 words
A corrosion resistant austenitic stainless steel alloy which is substantially fully austenitic and nonmagnetic in its annealed condition and which has a room temperature ultimate tensile strength of at least about 120,000 psi in its annealed condition, said alloy consisting essentially in weight percent of about
Claim 12
Dependent Claim
52 words
A corrosion resistant austenitic stainless steel alloy which is substantially fully austenitic and nonmagnetic in its annealed condition and in its cold worked condition and which has a room temperature ultimate tensile strength of at least about 120,000 psi in its annealed condition, said alloy consisting essentially in weight percent of about
Claim 13
Dependent Claim
52 words
A corrosion resistant austenitic stainless steel alloy which is substantially fully austenitic and nonmagnetic in its annealed condition and in its cold worked condition and which has a room temperature ultimate tensile strength of at least about 120,000 psi in its annealed condition, said alloy consisting essentially in weight percent of about
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |