Patent US3856516A successfully refreshed from Google Patents.
US3856516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low creep high strength ferrous alloy
Assignee: Blair Knox Co
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Filing: 1970-02-12
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Granted: 1974-12-24
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Expires: 1990-02-12
Abstract
Abstract A new alloy is provided having low creep and high strength at elevated temperatures which is resistant to corrosion and thermal shock and has unusual stress rupture characteristics at elevated temperatures comprising about 0.3% to 0.9% carbon, about 20% to 30% chromium, about 15% to 35% nickel, about 0.8% to 4% manganese, about 0.9% to 3.5% silicon, about 0.3% to 5% tungsten, about 0.03% to 0.15% sulfur and the balance iron with residual impurities in ordinary amounts.
Inventors
- 👤 R English
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:01
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/44
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
73 words
A LOW CREEP, HIGH STRENGTH ALLOY RESISTANT TO CORROSION AND THERMAL SHOCK AT ELEVATED TEMPERATURES AND HAVING UNUSUAL STRESS REPTURE CHARACTERISTICS AT ELEVATED TEMPERATURES CONSISTING ESSENTIALLY OF ABOUT 0.3% TO 0.9% CARBON, ABOUT 20% TO 30% CHROMIUM, ABOUT 15% TO 35% NICKEL, ABOUT 0.8% TO 4% MANGANESE, ABOUT 0.9% TO 3.5% SILICON, ABOUT 0.3% TO 5% TUNGSTEN, ABOUT 0.030% TO ABOUT 0.15% SULFUR AND THE BALANCE IRON WITH RESIDUAL IMPURITIES IN ORDINARY AMOUNTS.
Claim 2
Dependent Claim
73 words
A LOW CREEP, HIGH STRENGTH ALLOY RESISTANT TO CORROSION AND THERMAL SHOCK AT ELEVATED TEMPERATURES AND HAVING UNUSUAL STRESS REPTURE CHARACTERISTICS AT ELEVATED TEMPERATURES CONSISTING ESSENTIALLY OF ABOUT 0.3% TO 0.9% CARBON, ABOUT 20% TO 30% CHROMIUM, ABOUT 15% TO 35% NICKEL, ABOUT 0.8% TO 4% MANGANESE, ABOUT 0.9% TO 3.5% SILICON, ABOUT 0.3% TO 5% TUNGSTEN, ABOUT 0.030% TO ABOUT 0.15% SULFUR AND THE BALANCE IRON WITH RESIDUAL IMPURITIES IN ORDINARY AMOUNTS.
Claim 3
Dependent Claim
71 words
A low creep, high strength alloy resistant to corrosion and thermal shock at elevated temperatures having unusual stress rupture characteristics at elevated temperatures consisting essentially of about 0.35% to 0.75% carbon, about 20% to 30% chromium, about 30% to 35% nickel, about 1.2% to 2.4% manganese, about 1.2% to 2.5% silicon, about 1.75%% to 5% tungsten, about 0.035% to 0.10% sulfur and the balance iron with residual impurities in ordinary amounts.
Claim 4
Dependent Claim
71 words
A low creep, high strength alloy resistant to corrosion and thermal shock at elevated temperatures having unusual stress rupture characteristics at elevated temperatures consisting essentially of about 0.35% to 0.75% carbon, about 20% to 30% chromium, about 30% to 35% nickel, about 1.2% to 2.4% manganese, about 1.2% to 2.5% silicon, about 1.75%% to 5% tungsten, about 0.035% to 0.10% sulfur and the balance iron with residual impurities in ordinary amounts.
Claim 5
Dependent Claim
53 words
A low creep, high strength alloy resistant to corrosion and thermal shock at temperatures of 1,600* to 2,200* F. consisting essentially of about 0.4% carbon, about 23% chromium, about 30% nickel, about 1.5% manganese, about 2% silicon, about 1.75% tungsten, about 0.075% sulfur and the balance iron with residual impurities in ordinary amounts.
Claim 6
Dependent Claim
53 words
A low creep, high strength alloy resistant to corrosion and thermal shock at temperatures of 1,600* to 2,200* F. consisting essentially of about 0.4% carbon, about 23% chromium, about 30% nickel, about 1.5% manganese, about 2% silicon, about 1.75% tungsten, about 0.075% sulfur and the balance iron with residual impurities in ordinary amounts.
References Cited (Backward Citations)
US2557862A
Cited
US2677610A
Cited
US2686116A
Cited
US2984563A
Cited
US3115406A
Cited
US3165400A
Cited
US3260594A
Cited
US3376780A
Cited
US3563729A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |