# US 11,028,469 B2 · Hot press-formed part

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- Number: US 11,028,469 B2
- Document ID: US11028469B2
- Status: Granted
- Kind: B2
- Application number: 16/323,307
- Filed: 2016-08-16
- Published: 2020-05-21
- Granted: 2021-06-08
- Earliest claimed: 2016-08-16
- Assignees: Nippon Steel Corporation
- Applicants: Nippon Steel & Sumitomo Metal Corporation
- Inventors: Mutsumi Sakakibara; Natsuko Sugiura; Kunio Hayashi; Kaoru Kawasaki
- Web page: https://patentgrep.com/patent/US11028469B2

## CPC

- C21D 9/0068: {for particular articles not mentioned below}
- C22C 38/58: with more than 1.5% by weight of manganese
- B21D 22/022: {by heating the blank or stamping associated with heat treatment (C21D takes precedence)}
- B21D 22/20: Deep-drawing (special deep-drawing arrangements in, or in connection with, presses B21D24/00)
- C21D 1/19: by interrupted quenching
- C21D 1/673: for die quenching
- C21D 6/002: {containing Cr (C21D6/004 takes precedence)}
- C21D 6/005: {containing Mn}
- C21D 6/008: {containing Si}
- C21D 8/00: Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02)
- C21D 8/0426: {Hot rolling}
- C21D 8/0436: {Cold rolling}
- C21D 8/0463: {following hot rolling}
- C21D 9/48: deep-drawing sheets
- 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 38/005: {containing rare earths, i.e. Sc, Y, Lanthanides}
- 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 38/14: containing titanium or zirconium
- C22C 38/16: containing copper
- C22C 38/22: with molybdenum or tungsten
- C22C 38/34: with more than 1.5% by weight of silicon
- C22C 38/38: with more than 1.5% by weight of manganese
- C22C 38/44: with molybdenum or tungsten
- C21D 8/0473: {Final recrystallisation annealing}
- C21D 2201/05: Grain orientation
- C21D 2211/001: Austenite
- C21D 2211/002: Bainite
- C21D 2211/005: Ferrite
- C21D 2211/008: Martensite
- 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)
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- 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)

## Abstract

A hot press-formed part according to an aspect of the present invention contains a predetermined chemical composition; in which a microstructure in a thickness ¼ portion includes, by unit vol %, tempered martensite: 20% to 90%, bainite: 5% to 75%, and residual austenite: 5% to 25%, and ferrite is limited to 10% or less; and a pole density of an orientation {211}<011> in the thickness ¼ portion is 3.0 or higher.

## Claims

### Claim 1

A hot press-formed part comprising, by unit mass %,
C: 0.100% to 0.600%,
Si: 1.00% to 3.00%,
Mn: 1.00% to 5.00%,
P: 0.040% or less,
S: 0.0500% or less,
Al: 0.001% to 2.000%,
N: 0.0100% or less,
O: 0.0100% or less,
Mo: 0% to 1.00%,
Cr: 0% to 2.00%,
Ni: 0% to 2.00%,
Cu: 0% to 2.00%,
Nb: 0% to 0.300%,
Ti: 0% to 0.300%,
V: 0% to 0.300%,
B: 0% to 0.1000%,
Ca: 0% to 0.0100%,
Mg: 0% to 0.0100%,
REM: 0% to 0.0100%, and
a remainder including Fe and impurities,
wherein a microstructure in a thickness ¼ portion includes, by unit vol %, tempered martensite: 20% to 90%, bainite: 5% to 75%, and residual austenite: 5% to 25%, and ferrite is limited to 10% or less,
wherein a pole density of an orientation {211}<011> in the thickness ¼ portion is 3.0 or higher, and
a tensile strength TS is 1.200 MPa or higher,
a tensile product TSxEl is 26.000 MPa % or higher,
both an r value for a rolling direction and an r value for a transvers direction is 0.80 or smaller, and
both limitation of bending (R/t) in the rolling direction and limitation of bending (R/t) in the transvers direction is 2,0 or smaller.

### Claim 2 (depends on 1)

The hot press-formed part according to claim 1 comprising, by unit mass %, at least one selected from the group consisting of
Mo: 0.01% to 1.00%,
Cr: 0.05% to 2.00%,
Ni: 0.05% to 2.00%, and
Cu: 0.05% to 2.00%.

### Claim 3 (depends on 1)

The hot press-formed part according to claim 1 comprising, by unit mass %, at least one selected from the group consisting of
Nb: 0.005% to 0.300%,
Ti: 0.005% to 0.300%, and
V: 0.005% to 0.300%.

### Claim 4 (depends on 1)

The hot press-formed part according to claim 1 comprising, by unit mass %,
B: 0.0001% to 0.1000%.

### Claim 5 (depends on 1)

The hot press-formed part according to claim 1 comprising, by unit mass %, at least one selected from the group consisting of
Ca: 0.0005% to 0.0100%,
Mg: 0.0005% to 0.0100%, and
REM: 0.0005% to 0.0100%.

### Claim 6 (depends on 2)

The hot press-formed part according to claim 2 comprising, by unit mass %, at least one selected from the group consisting of
Nb: 0.005% to 0.300%,
Ti: 0.005% to 0.300%, and
V: 0.005% to 0.300%.

### Claim 7 (depends on 2)

The hot press-formed part according to claim 2 comprising, by unit mass %,
B: 0.0001% to 0.1000%.

### Claim 8 (depends on 3)

The hot press-formed part according to claim 3 comprising, by unit mass %,
B: 0.0001% to 0.1000%.

### Claim 9 (depends on 6)

The hot press-formed part according to claim 6 comprising, by unit mass %,
B: 0.0001% to 0.1000%.

### Claim 10 (depends on 2)

The hot press-formed part according to claim 2 comprising, by unit mass %, at least one selected from the group consisting of
Ca: 0.0005% to 0.0100%,
Mg: 0.0005% to 0.0100%, and
REM: 0.0005% to 0.0100%.

### Claim 11 (depends on 3)

The hot press-formed part according to claim 3 comprising, by unit mass %, at least one selected from the group consisting of
Ca: 0.0005% to 0.0100%,
Mg: 0.0005% to 0.0100%, and
REM: 0.0005% to 0.0100%.

### Claim 12 (depends on 4)

The hot press-formed part according to claim 4 comprising, by unit mass %, at least one selected from the group consisting of
Ca: 0.0005% to 0.0100%,
Mg: 0.0005% to 0.0100%, and
REM: 0.0005% to 0.0100%.

### Claim 13 (depends on 6)

The hot press-formed part according to claim 6 comprising, by unit mass %, at least one selected from the group consisting of
Ca: 0.0005% to 0.0100%,
Mg: 0.0005% to 0.0100%, and
REM: 0.0005% to 0.0100%.

### Claim 14 (depends on 7)

The hot press-formed part according to claim 7 comprising, by unit mass %, at least one selected from the group consisting of
Ca: 0.0005% to 0.0100%,
Mg: 0.0005% to 0.0100%, and
REM: 0.0005% to 0.0100%.

### Claim 15 (depends on 8)

The hot press-formed part according to claim 8 comprising, by unit mass %, at least one selected from the group consisting of
Ca: 0.0005% to 0.0100%,
Mg: 0.0005% to 0.0100%, and
REM: 0.0005% to 0.0100%.

### Claim 16 (depends on 9)

The hot press-formed part according to claim 9 comprising, by unit mass %, at least one selected from the group consisting of
Ca: 0.0005% to 0.0100%,
Mg: 0.0005% to 0.0100%, and
REM: 0.0005% to 0.0100%.