Hot press-formed part
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.
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.
2. 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%.
3. 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%.
4. The hot press-formed part according to claim 1 comprising, by unit mass %,
B: 0.0001% to 0.1000%.
5. 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%.
6. 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%.
7. The hot press-formed part according to claim 2 comprising, by unit mass %,
B: 0.0001% to 0.1000%.
8. The hot press-formed part according to claim 3 comprising, by unit mass %,
B: 0.0001% to 0.1000%.
9. The hot press-formed part according to claim 6 comprising, by unit mass %,
B: 0.0001% to 0.1000%.
10. 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%.
11. 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%.
12. 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%.
13. 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%.
14. 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%.
15. 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%.
16. 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%.