US3881881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum coated steel
Assignee: Inland Steel Co
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Filing: 1974-04-03
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Granted: 1975-05-06
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Expires: 1994-04-03
Abstract
Abstract An aluminum coated low alloy low-carbon steel sheet material having increased resistance to oxidation at elevated temperatures of about 1,500*F which is formed by incorporating in a low-carbon steel before rolling and hot-dip aluminum coating an amount of aluminum between about 0.5 and 2 percent by weight and silicon in an amount between about 0.5 and 2 percent by weight, with the ratio of aluminum of silicon being between about 0.5 to about 1.5. Metals which have strong carbide and oxide forming properties, particularly chromium and titanium, can also be used in combination with the low-carbon aluminumsilicon steel in an amount which preferably does not exceed about 2 percent by weight of the steel.
Inventors
- 👤 Yong-Wu Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:38
CPC Classifications
C; C23; C23C; C23C2/00; C23C2/04; C23C2/12; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/939; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/1275; Y10T428/12757; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12972
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
86 words
AN ALUMINUM COATED LOW ALLOY STEEL ARTICLE HAVING GOOD FORMABILITY AND RESISTANCE TO OXIDATION AT ELEVATED TEMPERATURES CONSISTING ESSENTIALLY OF A LOW ALLOY LOW-CARBON STEEL BASE HAVING INCORPORATED THEREIN AS ESSENTIAL ALLOYING ELEMENTS A QUANTITY OF SILICON AND ALUMINUM WITH EACH BEING PRESENT IN AN AMOUNT RANGING BETWEEN ABOUT 0.5 PERCENT TO ABOUT 2.0 PERCENT BY WEIGHT OF SAID STEEL AND THE RATIO OF ALUMINUM TO SILICON BEING BETWEEN ABOUT 0.5 AND ABOUT 1.5 AND SAID BASE HAVING ON THE SURFACE THEREOF A COATING OF ALUMINUM.
Claim 2
Dependent Claim
86 words
AN ALUMINUM COATED LOW ALLOY STEEL ARTICLE HAVING GOOD FORMABILITY AND RESISTANCE TO OXIDATION AT ELEVATED TEMPERATURES CONSISTING ESSENTIALLY OF A LOW ALLOY LOW-CARBON STEEL BASE HAVING INCORPORATED THEREIN AS ESSENTIAL ALLOYING ELEMENTS A QUANTITY OF SILICON AND ALUMINUM WITH EACH BEING PRESENT IN AN AMOUNT RANGING BETWEEN ABOUT 0.5 PERCENT TO ABOUT 2.0 PERCENT BY WEIGHT OF SAID STEEL AND THE RATIO OF ALUMINUM TO SILICON BEING BETWEEN ABOUT 0.5 AND ABOUT 1.5 AND SAID BASE HAVING ON THE SURFACE THEREOF A COATING OF ALUMINUM.
Claim 3
Dependent Claim
29 words
An aluminum coated low alloy steel article as in claim 1, wherein said steel base comprises about 0.6 percent by weight aluminum and about 1.2 percent by weight silicon.
Claim 4
Dependent Claim
29 words
An aluminum coated low alloy steel article as in claim 1, wherein said steel base comprises about 1 percent by weight aluminum and about 1 percent by weight silicon.
Claim 5
Dependent Claim
26 words
An aluminum coated low alloy steel article as in claim 1, wherein said steel base has a maximum carbon content of about 0.1 percent by weight.
Claim 6
Dependent Claim
46 words
An aluminum coated low alloy steel article as in claim 4, wherein said steel base contains not substantially in excess of about 2 percent by weight of a strong carbide former selected from the group of metals consisting of titanium, molybdenum, zirconium, hafnium, vanadium and chromium.
Claim 7
Dependent Claim
31 words
An aluminum coated low alloy steel article as in claim 5, wherein said carbide and oxide former comprises chromium in an amount of about 1 percent by weight of said steel.
Claim 8
Dependent Claim
24 words
An aluminum coated low alloy steel article as in claim 6, wherein said steel contains a maximum of about 0.5 percent by weight titanium.
Claim 9
Dependent Claim
25 words
An aluminum coated low alloy steel article as in claim 1, wherein said coating is aluminum containing up to about 11 percent by weight silicon.
Claim 10
Dependent Claim
88 words
In a method of coating a low alloy steel to form an article having good formability and high temperature oxidation resistance, the improvement comprising; coating a low alloy low-carbon steel base with aluminum to provide a surface layer of aluminum, and said steel base having incorporated therein a quantity of silicon and aluminum with each being present in an amount ranging between about 0.5 percent to about 2.0 percent by weight of said steel and the ratio of aluminum to silicon being between about 0.5 and about 1.5.
Claim 11
Dependent Claim
88 words
In a method of coating a low alloy steel to form an article having good formability and high temperature oxidation resistance, the improvement comprising; coating a low alloy low-carbon steel base with aluminum to provide a surface layer of aluminum, and said steel base having incorporated therein a quantity of silicon and aluminum with each being present in an amount ranging between about 0.5 percent to about 2.0 percent by weight of said steel and the ratio of aluminum to silicon being between about 0.5 and about 1.5.
Claim 12
Dependent Claim
31 words
A method as in claim 9, wherein said steel base is coated with aluminum by immersing in a molten aluminum bath which contains up to about 11 percent by weight silicon.
Claim 13
Dependent Claim
24 words
A method as in claim 9, wherein said steel base is a low caRbon steel containing a maximum of 0.1 percent by weight carbon.
Claim 14
Dependent Claim
40 words
A method as in claim 11, wherein said steel base has incorporated therein a maximum of about 2 percent by weight of a strong carbide forming metal selected from the group consisting of titanium, molybdenum, zirconium, hafnium, vanadium and chromium.
Claim 15
Dependent Claim
39 words
A method as in claim 11, wherein said steel base contains a maximum of about 0.05 percent by weight carbon, about 1 percent by weight aluminum, about 1 percent by weight silicon, and about 0.5 percent by weight titanium.
Claim 16
Dependent Claim
17 words
A method as in claim 13, wherein said steel base contains about 1.25 percent by weight chromium.
Claim 17
Dependent Claim
33 words
A method as in claim 11, wherein said steel base contains a maximum of about 0.05 percent by weight carbon, about 0.6 percent by weight aluminum and about 1.2 percent by weight silicon.
References Cited (Backward Citations)
US3754874A
Cited
US3705023A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |