# US 11,992,867 B2 · Hot stamped body

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- Number: US 11,992,867 B2
- Document ID: US11992867B2
- Status: Granted
- Kind: B2
- Application number: 17/802,584
- Filed: 2020-02-27
- Published: 2023-03-23
- Granted: 2024-05-28
- Earliest claimed: 2020-02-27
- Assignees: Nippon Steel Corporation
- Applicants: Nippon Steel Corporation
- Inventors: Takuya Mitsunobu; Takehiro Takahashi; Jun Maki
- Web page: https://patentgrep.com/patent/US11992867B2

## CPC

- B21D 22/022: {by heating the blank or stamping associated with heat treatment (C21D takes precedence)}
- C23C 2/02: Pretreatment of the material to be coated, e.g. for coating on selected surface areas (C23C2/30 takes precedence)
- B21D 22/20: Deep-drawing (special deep-drawing arrangements in, or in connection with, presses B21D24/00)
- B32B 15/013: {one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium}
- C22C 18/04: with aluminium as the next major constituent
- C22C 21/10: with zinc as the next major constituent
- C23C 2/06: Zinc or cadmium or alloys based thereon
- C23C 2/12: Aluminium or alloys based thereon
- C23C 2/26: After-treatment (C23C2/14 takes precedence)
- C23C 2/28: Thermal after-treatment, e.g. treatment in oil bath
- C23C 2/29: {Cooling or quenching}
- C23C 28/02: only coatings {only including layers} of metallic material
- C23C 28/023: {only coatings of metal elements only}
- C23C 28/025: {with at least one zinc-based layer}
- C21D 1/18: Hardening (C21D1/02 takes precedence); Quenching with or without subsequent tempering (quenching devices C21D1/62)
- C21D 9/00: Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C22C 38/00: Ferrous alloys, e.g. steel alloys (cast-iron alloys C22C37/00)
- C22C 38/001: {containing N}
- C22C 38/002: {containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60}
- C22C 38/02: containing silicon
- C22C 38/04: containing manganese
- C22C 38/06: containing aluminium
- C22C 38/28: with titanium or zirconium
- C22C 38/58: with more than 1.5% by weight of manganese
- Y10T 428/12757: Fe
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)
- 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)
- 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)
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A hot stamped body comprising a steel base material and an Al—Zn—Mg-based plating layer formed on a surface of the steel base material, wherein the plating layer has a predetermined chemical composition, the plating layer comprises an interfacial layer positioned at an interface with the steel base material and containing Fe and Al and a main layer positioned on the interfacial layer, the main layer comprises, by area ratio, 10.0 to 90.0% of an Mg—Zn containing phase, 5.0 to less than 30.0% of an Fe—Al containing phase, and 2.0 to 25.0% of an Al—Si containing oxide phase, the Mg—Zn containing phase comprises at least one selected from the group consisting of an MgZn phase, Mg2Zn3 phase, and MgZn2 phase, and the Fe—Al containing phase comprises at least one of an FeAl phase and Fe—Al—Zn phase.

## Claims

### Claim 1

A hot stamped body comprising a steel base material and a plating layer on a surface of the steel base material, wherein the plating layer has a chemical composition comprising, by mass %,
Al: 15.00 to 55.00%,
Mg: 4.50 to 12.00%,
Si: 0.05 to 3.00%,
Ca: 0.05 to 3.00%,
Fe: 20.00 to 65.00%,
Sb: 0 to 0.50%,
Pb: 0 to 0.50%,
Cu: 0 to 1.00%,
Sn: 0 to 1.00%,
Ti: 0 to 1.00%,
Sr: 0 to 0.50%,
Cr: 0 to 1.00%,
Ni: 0 to 1.00%,
Mn: 0 to 1.00%, and
balance: Zn and impurities,
the plating layer comprises an interfacial layer positioned at an interface with the steel base material and containing Fe and Al and a main layer positioned on the interfacial layer,
the main layer comprises, by area ratio, 10.0 to 90.0% of an Mg—Zn containing phase, 5.0 to less than 30.0% of an Fe—Al containing phase, and 2.0 to 25.0% of an Al—Si containing oxide phase,
the Mg—Zn containing phase comprises at least one selected from an MgZn phase, Mg2Zn3 phase, and MgZn2 phase, and
the Fe—Al containing phase comprises at least one of an FeAl phase and Fe—Al—Zn phase.

### Claim 2 (depends on 1)

The hot stamped body according to claim 1, wherein the chemical composition of the plating layer comprises, by mass %,
Al: 25.00 to 35.00% and
Mg: 6.00 to 10.00%.

### Claim 3 (depends on 1)

The hot stamped body according to claim 1, wherein the Mg—Zn containing phase comprises an MgZn phase, and an area ratio of the MgZn phase in the main layer is 30.0% to 90.0%.

### Claim 4 (depends on 1)

The hot stamped body according to claim 1, wherein the Mg—Zn containing phase comprises an MgZn phase and Mg2Zn3 phase, and an area ratio of a total of the MgZn phase and Mg2Zn3 phase in the main layer is 40.0 to 85.0%.

### Claim 5 (depends on 1)

The hot stamped body according to claim 1, wherein the Fe—Al containing phase comprises an FeAl phase and an area ratio of the FeAl phase in the main layer is 5.0 to 20.0%.

### Claim 6 (depends on 2)

The hot stamped body according to claim 2, wherein the Mg—Zn containing phase comprises an MgZn phase, and an area ratio of the MgZn phase in the main layer is 30.0% to 90.0%.

### Claim 7 (depends on 2)

The hot stamped body according to claim 2, wherein the Mg—Zn containing phase comprises an MgZn phase and Mg2Zn3 phase, and an area ratio of a total of the MgZn phase and Mg2Zn3 phase in the main layer is 40.0 to 85.0%.

### Claim 8 (depends on 3)

The hot stamped body according to claim 3, wherein the Mg—Zn containing phase comprises an MgZn phase and Mg2Zn3 phase, and an area ratio of a total of the MgZn phase and Mg2Zn3 phase in the main layer is 40.0 to 85.0%.

### Claim 9 (depends on 2)

The hot stamped body according to claim 2, wherein the Fe—Al containing phase comprises an FeAl phase and an area ratio of the FeAl phase in the main layer is 5.0 to 20.0%.

### Claim 10 (depends on 3)

The hot stamped body according to claim 3, wherein the Fe—Al containing phase comprises an FeAl phase and an area ratio of the FeAl phase in the main layer is 5.0 to 20.0%.

### Claim 11 (depends on 4)

The hot stamped body according to claim 4, wherein the Fe—Al containing phase comprises an FeAl phase and an area ratio of the FeAl phase in the main layer is 5.0 to 20.0%.