# US 2013/0280552 A1 · Aluminum Coated Steel Sheet Having Excellent Oxidation Resistance and Heat Resistance

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- Number: US 2013/0280552 A1
- Document ID: US20130280552A1
- Status: Published application
- Kind: A1
- Application number: 13/824,484
- Filed: 2011-12-09
- Published: 2013-10-24
- Earliest claimed: 2010-12-27
- Assignees: Posco Coated & Color Steel Co., Ltd.; Posco
- Inventors: Dae-Chul Bae; Tae-Hun Lim; Young-Sool Jin
- Web page: https://patentgrep.com/patent/US20130280552A1

## CPC

- B32B 15/012: {one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy}
- C22C 38/001: {containing N}
- C22C 38/02: containing silicon
- C22C 38/04: containing manganese
- C22C 38/06: containing aluminium
- C22C 38/08: containing nickel {(C22C38/105 takes precedence)}
- C22C 38/12: containing tungsten, tantalum, molybdenum, vanadium, or niobium
- C22C 38/16: containing copper
- C23C 2/02: Pretreatment of the material to be coated, e.g. for coating on selected surface areas (C23C2/30 takes precedence)
- C23C 2/0222: {in a reactive atmosphere, e.g. oxidising or reducing atmosphere (C23C2/024 takes precedence)}
- C23C 2/0224: {Two or more thermal pretreatments}
- C23C 2/024: {by cleaning or etching}
- C23C 2/12: Aluminium or alloys based thereon
- Y10T 428/12757: Fe
- Y10T 428/12764: Next to Al-base component
- Y10T 428/12972: Containing 0.01-1.7% carbon [i.e., steel]
- Y10T 428/265: 1 mil or less
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Provided is an aluminum coated steel sheet having excellent oxidation and heat resistance. The aluminum coated steel sheet includes an aluminum coating layer and an alloy layer. The aluminum coating layer is formed on a surface of a steel sheet which includes 0.001 to 0.015 wt % of carbon (C), 0.05 to 0.3 wt % of silicon (Si), 0.1 to 0.6 wt % of manganese (Mn), 0.01 to 0.05 wt % niobium (Nb), 0.01 wt % or less of phosphorus (P), 0.01 wt % or less of sulfur (S), 0.1 wt % or less of soluble aluminum (Al), 0.05 to 0.5 wt % of copper (Cu), 0.05 to 0.5 wt % nickel (Ni), 0.001 to 0.01 wt % of nitrogen (N), and the balance of Fe and inevitable impurities. The alloy layer includes an intermetallic compound at an interface between the steel sheet and the aluminum coating layer.

## Claims

### Claim 1

An aluminum coated steel sheet having excellent oxidation resistance and heat resistance, comprising:
an aluminum coating layer formed on a surface of a steel sheet which comprises 0.001 to 0.015 wt % of carbon (C), 0.05 to 0.3 wt % of silicon (Si), 0.1 to 0.6 wt % of manganese (Mn), 0.01 to 0.05 wt % niobium (Nb), 0.01 wt % or less of phosphorus (P), 0.01 wt % or less of sulfur (S), 0.1 wt % or less of soluble aluminum (Al), 0.05 to 0.5 wt % of copper (Cu), 0.05 to 0.5 wt % nickel (Ni), 0.001 to 0.01 wt % of nitrogen (N), and the balance of Fe and inevitable impurities; and
an alloy layer which comprises an intermetallic compound at an interface between the steel sheet and the aluminum coating layer.

### Claim 2 (depends on 1)

The aluminum coated steel sheet of claim 1, wherein the intermetallic compound is a Cu—Ni—Fe(—Al—Si)-based intermetallic compound.

### Claim 3 (depends on 1)

The aluminum coated steel sheet of claim 1, wherein the alloy layer has a thickness of about 3 μm or less.

### Claim 4 (depends on 1)

The aluminum coated steel sheet of claim 1, wherein the aluminum coating layer comprises 5 to 11 wt % of silicon (Si) and the balance of aluminum (Al) and inevitable impurities.

### Claim 5 (depends on 1)

The aluminum coated steel sheet of claim 1, wherein the aluminum coating layer comprises 10 wt % or less of steel (Fe) and 50 wt % or more of aluminum (Al).

### Claim 6 (depends on 1)

The aluminum coated steel sheet of claim 1, wherein the aluminum coating layer has a thickness of 10 μm to 30 μm.