Patent US1248723A successfully refreshed from Google Patents.
Patent US3876475A successfully refreshed from Google Patents.
US3876475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion resistant alloy
Assignee: Rederi Nordstjernan AB
•
Filing: 1973-10-19
•
Granted: 1975-04-08
•
Expires: 1993-10-19
Abstract
Abstract A corrosion resistant alloy is provided having as essential elements about 0.8 to 1.2% carbon, 1 to 2.2% silicon, 0.4 to 10% manganese, 23 to 35% chromium, 2.5 to 11% tungsten, 1 to 4% molybdenum and the balance essentially iron. Other elements may be optionally present, such as up to about 2% each of cobalt, nickel, niobium, tantalum, vanadium, titanium, up to about 1% aluminum, up to about 0.1% boron, up to about 1% nitrogen, up to about 4% copper, rhenium in amounts of up to about 30% of the tungsten content, and up to about 3% of misch metal.
Inventors
- 👤 Lars Henry Ramqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:22
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/38; C22C38/22
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
126 words
A NON-AUSTENITIC HEAT AND CORROSION RESISTANT ALLOY ADAPTED FOR USE IN HOT VANADIUM-CONTAINING GASEOUS ATMOSPHERES CONSISTING ESSENTIALLY BY WEIGHT OF ABOUT 0.8 TO 1.2% CARBON, ABOUT 1 TO 2.2% SILICON, ABOUT 0.4 TO 10% MANGANESE, ABOUT 23 TO 35% CHROMIUM, ABOUT 2.5 TO 11% TUNGSTEN, ABOUT 1 TO 4% MOLYBDENUM, 0 TO ABOUT 2% EACH OF AN ALLOYING ELEMENT SELECTED FROM THE GROUP CONSISTING OF COBALT, NICKEL, NIOBIUM, TANTALUM, VANADIUM AND TITANIUM, 0 TO ABOUT 1% NITROGEN, ALUMINUM, 0 TO ABOUT 0.1% BORON, 0 TO ABOUT 1% NITROGEN, 0 TO ABOUT 4% COPPER, RHENIUM RANGING FROM 0 TO ABOUT 3.3% AND 0 TO ABOUT 3% TOTAL OF MISCH METAL, AND THE BALANCE ESSENTIALLY IRON, SAID ALLOY BEING CHARACTERIZED BY THE PRESENCE OF FERRITE AND SIGMA PHASES.
Claim 2
Dependent Claim
126 words
A NON-AUSTENITIC HEAT AND CORROSION RESISTANT ALLOY ADAPTED FOR USE IN HOT VANADIUM-CONTAINING GASEOUS ATMOSPHERES CONSISTING ESSENTIALLY BY WEIGHT OF ABOUT 0.8 TO 1.2% CARBON, ABOUT 1 TO 2.2% SILICON, ABOUT 0.4 TO 10% MANGANESE, ABOUT 23 TO 35% CHROMIUM, ABOUT 2.5 TO 11% TUNGSTEN, ABOUT 1 TO 4% MOLYBDENUM, 0 TO ABOUT 2% EACH OF AN ALLOYING ELEMENT SELECTED FROM THE GROUP CONSISTING OF COBALT, NICKEL, NIOBIUM, TANTALUM, VANADIUM AND TITANIUM, 0 TO ABOUT 1% NITROGEN, ALUMINUM, 0 TO ABOUT 0.1% BORON, 0 TO ABOUT 1% NITROGEN, 0 TO ABOUT 4% COPPER, RHENIUM RANGING FROM 0 TO ABOUT 3.3% AND 0 TO ABOUT 3% TOTAL OF MISCH METAL, AND THE BALANCE ESSENTIALLY IRON, SAID ALLOY BEING CHARACTERIZED BY THE PRESENCE OF FERRITE AND SIGMA PHASES.
Claim 3
Dependent Claim
42 words
The alloy of claim 1, in which the amount of essential elements range from about 0.8 to 1.2% carbon, about 1.8 to 2.2% silicon, about 0.4 to 10% manganese, about 28 to 35% chromium, about 7 to 11% tungsten, and about 1
Claim 4
Dependent Claim
42 words
The alloy of claim 1, in which the amount of essential elements range from about 0.8 to 1% carbon, about 1.5 to 2% silicon, about 1 to 10% manganese, about 23 to 32% chromium, about 2.5 to 9% tungsten, and about 1
Claim 5
Dependent Claim
126 words
As an article of manufacture, a heat and corrosion resistant structural element adapted for use in corrosive vanadium-containing environment at temperatures of over about 500.degree.C, said element being formed of an alloy consisting essentially by weight of about 0.8 to 1.2% carbon, about 1 to 2.2% silicon, about 0.4 to 10% manganese, about 23 to 35% chromium, about 2.5 to 11% tungsten, about 1 to 4% molybdenum, 0 to about 2% each of an alloying element selected from the group consisting of cobalt, nickel, niobium, tantalum, vanadium and titanium, 0 to about 1% aluminum, 0 to about 0.1% boron, 0 to about 1% nitrogen, 0 to about 4% copper, rhenium in amounts ranging from 0 to about 3.3% and 0 to about 3% total of misch
Claim 6
Dependent Claim
126 words
As an article of manufacture, a heat and corrosion resistant structural element adapted for use in corrosive vanadium-containing environment at temperatures of over about 500.degree.C, said element being formed of an alloy consisting essentially by weight of about 0.8 to 1.2% carbon, about 1 to 2.2% silicon, about 0.4 to 10% manganese, about 23 to 35% chromium, about 2.5 to 11% tungsten, about 1 to 4% molybdenum, 0 to about 2% each of an alloying element selected from the group consisting of cobalt, nickel, niobium, tantalum, vanadium and titanium, 0 to about 1% aluminum, 0 to about 0.1% boron, 0 to about 1% nitrogen, 0 to about 4% copper, rhenium in amounts ranging from 0 to about 3.3% and 0 to about 3% total of misch
Claim 7
Dependent Claim
39 words
The article of manufacture of claim 4, wherein the amount of essential elements ranges from about 0.8 to 1.2% carbon, about 1.8 to 2.2% silicon, about 0.4 to 10% manganese, about 28 to 35% chromium, about 7 to 11%
Claim 8
Dependent Claim
39 words
The article of manufacture of claim 4, wherein the amount of essential elements ranges from about 0.8 to 1% carbon, about 1.5 to 2% silicon, about 1 to 10% manganese, about 23 to 32% chromium, about 2.5 to 9%
Claim 9
Dependent Claim
11 words
The article of manufacture of claim 4, wherein said structural element
Claim 10
Dependent Claim
11 words
The article of manufacture of claim 5, wherein said structural element
Claim 11
Dependent Claim
19 words
The article of manufacture of claim 6, wherein the structural element is a valve seat formed of said alloy.
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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |