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Aluminum or aluminum alloy-coated steel material and method of manufacturing the same
US9493868B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9493868-B2 |
| Application number | US-201214364357-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 10, 2012 |
| Priority date | Dec 12, 2011 |
| Publication date | Nov 15, 2016 |
| Grant date | Nov 15, 2016 |
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- Title
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Abstract
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An aluminum or aluminum alloy-coated steel material includes base steel; and a coating layer formed on a surface of the base steel and containing by mass % Mg: 6% to 10%, Si: 3% to 7%, Fe: 0.2% to 2%, Mn: 0.02% to 2%, and the balance as Al and incidental impurities, wherein the coating layer has pseudoternary eutectic microstructures of αAl—Mg 2 Si—(Al—Fe—Si—Mn) and an area ratio of the pseudoternary eutectic microstructures in the coating layer is at least 30%.
First claim
Opening claim text (preview).
The invention claimed is: 1. An aluminum alloy-coated steel material, comprising: base steel; and a coating layer formed on a surface of the base steel and consisting of by mass % Mg: 6% to 10%, Si: 3% to 7%, Fe: 0.2% to 2%, Mn: 0.02% to 2%, and the balance as Al and incidental impurities, wherein molar ratios Mg/Si, Mn/Fe, and Mg 2 Si/Al of the coating layer satisfy 1.7≦Mg/Si≦2.3, 0.1≦Mn/Fe≦1.0, and Mg 2 Si/Al≦1, respectively, and the coating layer has pseudoternary eutectic microstructures of αAl—Mg 2 Si—(Al—Fe—Si—Mn) and an area ratio of the pseudoternary eutectic microstructures in the coating layer is at least 30%. 2. A method of manufacturing an aluminum alloy-coated steel material of claim 1 , comprising: preparing a coating bath having a composition consisting of by mass % Mg: 6% to 10%, Si: 3% to 7%, Fe: 2% or less (inclusive of 0%), Mn: 0.02% to 2%, and the balance as Al and incidental impurities; immersing a steel material to be subjected to coating treatment in the coating bath temperature at (melting point of the coating bath+20° C.) to 750° C. for a period of 0.5 second or longer; and cooling the steel material at cooling rate of 20° C./second or higher.
Assignees
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Classifications
for die quenching · CPC title
Dispersions; Precipitations · CPC title
Final recrystallisation annealing · CPC title
involving a particular surface treatment (C21D8/0494 takes precedence) · CPC title
Fe · CPC title
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- What does patent US9493868B2 cover?
- An aluminum or aluminum alloy-coated steel material includes base steel; and a coating layer formed on a surface of the base steel and containing by mass % Mg: 6% to 10%, Si: 3% to 7%, Fe: 0.2% to 2%, Mn: 0.02% to 2%, and the balance as Al and incidental impurities, wherein the coating layer has pseudoternary eutectic microstructures of αAl—Mg 2 Si—(Al—Fe—Si—Mn) and an area ratio of the pseudot…
- Who is the assignee on this patent?
- Jfe Steel Corp, Tokyo Inst Tech
- What technology area does this patent fall under?
- Primary CPC classification C23C2/12. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 15 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).