Method of manufacturing hot press formed part, and hot press formed part

1. A method of manufacturing a hot press formed part by hot pressing a coated steel sheet that is obtained by forming a Zn-based coating layer on a surface of a steel sheet, the method comprising:

heating the coated steel sheet to a temperature range of 750° C. or more and 1000° C. or less;

cooling a surface of the coated steel sheet; and

hot press forming the coated steel sheet under a condition that a surface temperature of the coated steel sheet is 400° C. or less and an average temperature of the coated steel sheet is 500° C. or more.

2. The method of manufacturing a hot press formed part according to claim 1 ,

wherein the coating layer is a Zn—Ni coating layer, and a Ni content in the Zn—Ni coating layer is 9% or more and 25% or less by mass.

3. The method of manufacturing a hot press formed part according to claim 2 , wherein the steel sheet has a chemical composition that includes, in % by mass: 0.15% or more and 0.50% or less C; 0.05% or more and 2.00% or less Si; 0.50% or more and 3.00% or less Mn; 0.10% or less P; 0.050% or less S; 0.0002% or more and 0.0050% or less B; 0.10% or less Al; and 0.010% or less N, with a balance including Fe and incidental impurities.

4. The method of manufacturing a hot press formed part according to claim 3 ,

wherein the chemical composition further includes, in % by mass, at least one type selected from the group consisting of: 0.01% or more and 0.5% or less Cr; 0.01% or more and 0.5% or less V; 0.01% or more and 0.5% or less Mo; and 0.01% or more and 0.5% or less Ni.

5. The method of manufacturing a hot press formed part according to claim 4 ,

wherein the chemical composition further includes, in % by mass, 0.01% or more and 0.20% or less Ti.

6. The method of manufacturing a hot press formed part according to claim 5 ,

wherein the chemical composition further includes, in % by mass, 0.01% or more and 0.10% or less Nb.

7. The method of manufacturing a hot press formed part according to claim 6 , wherein the chemical composition further includes, in % by mass, 0.003% or more and 0.03% or less Sb.

8. The method of manufacturing a hot press formed part according to claim 1 ,

wherein the coating layer is a Zn—Fe coating layer, and a Fe content in the Zn—Fe coating layer is 5% or more and 80% or less by mass.

9. The method of manufacturing a hot press formed part according to claim 1 ,

wherein the steel sheet has a chemical composition that includes, in % by mass: 0.15% or more and 0.50% or less C; 0.05% or more and 2.00% or less Si; 0.50% or more and 3.00% or less Mn; 0.10% or less P; 0.050% or less S; 0.0002% or more and 0.0050% or less B; 0.10% or less Al; and 0.010% or less N, with a balance including Fe and incidental impurities.

10. The method of manufacturing a hot press formed part according to claim 9 ,

wherein the chemical composition further includes, in % by mass, at least one type selected from the group consisting of: 0.01% or more and 0.5% or less Cr; 0.01% or more and 0.5% or less V; 0.01% or more and 0.5% or less Mo; and 0.01% or more and 0.5% or less Ni.

11. The method of manufacturing a hot press formed part according to claim 10 ,

wherein the chemical composition further includes, in % by mass, 0.01% or more and 0.20% or less Ti.

12. The method of manufacturing a hot press formed part according to claim 11 ,

wherein the chemical composition further includes, in % by mass, 0.01% or more and 0.10% or less Nb.

13. The method of manufacturing a hot press formed part according to claim 12 ,

wherein the chemical composition further includes, in % by mass, 0.003% or more and 0.03% or less Sb.

14. A method of manufacturing a hot press formed part by hot pressing a coated steel sheet that is obtained by forming a Zn-based coating layer on a surface of a steel sheet, the method comprising:

heating the coated steel sheet to a temperature range of 750° C. or more and 1000° C. or less;

cooling a surface of the coated steel sheet; and

hot press forming the coated steel sheet under a condition that a surface temperature of the coated steel sheet is 400° C. or less and a temperature of a center position of the coated steel sheet in a thickness direction is 530° C. or more.

15. The method of manufacturing a hot press formed part according to claim 14 ,

wherein the coating layer is a Zn—Ni coating layer, and a Ni content in the Zn—Ni coating layer is 9% or more and 25% or less by mass.

16. The method of manufacturing a hot press formed part according to claim 15 ,

wherein the steel sheet has a chemical composition that includes, in % by mass: 0.15% or more and 0.50% or less C; 0.05% or more and 2.00% or less Si; 0.50% or more and 3.00% or less Mn; 0.10% or less P; 0.050% or less S; 0.0002% or more and 0.0050% or less B; 0.10% or less Al; and 0.010% or less N, with a balance including Fe and incidental impurities.

17. The method of manufacturing a hot press formed part according to claim 16 ,

wherein the chemical composition further includes, in % by mass, at least one type selected from the group consisting of: 0.01% or more and 0.5% or less Cr; 0.01% or more and 0.5% or less V; 0.01% or more and 0.5% or less Mo; and 0.01% or more and 0.5% or less Ni.

18. The method of manufacturing a hot press formed part according to claim 17 , wherein the chemical composition further includes, in % by mass, 0.01% or more and 0.20% or less Ti.

19. The method of manufacturing a hot press formed part according to claim 18 ,

wherein the chemical composition further includes, in % by mass, 0.01% or more and 0.10% or less Nb.

20. The method of manufacturing a hot press formed part according to claim 19 , wherein the chemical composition further includes, in % by mass, 0.003% or more and 0.03% or less Sb.