Steel sheet for hot press formed member having excellent coating adhesion and manufacturing method for the same

Patent metadata

Field	Value
Publication number	US-11820103-B2
Application number	US-202117517399-A
Country	US
Kind code	B2
Filing date	Nov 2, 2021
Priority date	Jun 1, 2017
Publication date	Nov 21, 2023
Grant date	Nov 21, 2023

Abstract

The present invention relates to a steel sheet for a hot press formed member having excellent coating adhesion, and a method for manufacturing the same. A steel sheet for hot press forming according to one aspect of the present invention is an aluminum alloy plated steel sheet, wherein an average Fe content in a plating layer may be 40 wt % or more, and a concentration gradient of a section having a Fe content of 45 wt % to 80 wt % in the plating layer may 7 wt %/μm or less of a concentration gradient at a section having an Fe content of 45% to 80% in the plating layer in a thickness direction from a surface of the plating layer according to a result of GDS analysis.

First claim

The invention claimed is:

1. A hot press formed member, comprising:
a steel sheet; and
a plating layer on the steel sheet,
wherein a concentration gradient at a section having an Fe content of 45% to 80% in the plating layer in a thickness direction from a surface of the plating layer according to a result of GDS analysis is 7 wt %/μm or less.

2. The hot press formed member of claim 1 ,
wherein the concentration gradient is 5 wt %/μm or less.

3. The hot press formed member of claim 1 ,
wherein an average content of Fe of the plating layer is 40 wt % or more.

4. The hot press formed member of claim 1 ,
wherein an average content of Fe of the plating layer is 50 wt % or more.

5. The hot press formed member of claim 1 ,
wherein the steel sheet comprises a composition comprising, by wt %, carbon (C): 0.04% to 0.5%, silicon (Si): 0.01% to 2%, manganese (Mn): 0.01% to 10%, aluminum (Al): 0.001% to 1.0%, phosphorus (P): 0.05% or less, sulfur (S): 0.02% or less, nitrogen (N): 0.02% or less, and residual iron (Fe) and inevitable impurities.

6. The hot press formed member of claim 5 ,
wherein the composition of the steel sheet further comprises, by wt %, one or more among a sum of one or more selected from the group consisting of Cr, Mo, and W: 0.01% to 4.0%, a sum of one or more selected from the group consisting of Ti, Nb, Zr, and V: 0.001% to 0.4%, Cu+Ni: 0.005% to 2.0%, Sb+Sn: 0.001% to 1.0%, and B: 0.0001 to 0.01%.

7. The hot press formed member of claim 2 ,
wherein an average content of Fe of the plating layer is 40 wt % or more.

8. The hot press formed member of claim 2 ,
wherein an average content of Fe of the plating layer is 50 wt % or more.

9. The hot press formed member of claim 2 ,
wherein the steel sheet comprises a composition comprising, by wt %, carbon (C): 0.04% to 0.5%, silicon (Si): 0.01% to 2%, manganese (Mn): 0.01% to 10%, aluminum (Al): 0.001% to 1.0%, phosphorus (P): 0.05% or less, sulfur (S): 0.02% or less, nitrogen (N): 0.02% or less, and residual iron (Fe) and inevitable impurities.

10. The hot press formed member of claim 9 ,
wherein the composition of the steel sheet further comprises, by wt %, one or more among a sum of one or more selected from the group consisting of Cr, Mo, and W: 0.01% to 4.0%, a sum of one or more selected from the group consisting of Ti, Nb, Zr, and V: 0.001% to 0.4%, Cu+Ni: 0.005% to 2.0%, Sb+Sn: 0.001% to 1.0%, and B: 0.0001 to 0.01%.

11. The hot press formed member of claim 3 ,
wherein the steel sheet comprises a composition comprising, by wt %, carbon (C): 0.04% to 0.5%, silicon (Si): 0.01% to 2%, manganese (Mn): 0.01% to 10%, aluminum (Al): 0.001% to 1.0%, phosphorus (P): 0.05% or less, sulfur (S): 0.02% or less, nitrogen (N): 0.02% or less, and residual iron (Fe) and inevitable impurities.

12. The hot press formed member of claim 11 ,
wherein the composition of the steel sheet further comprises, by wt %, one or more among a sum of one or more selected from the group consisting of Cr, Mo, and W: 0.01% to 4.0%, a sum of one or more selected from the group consisting of Ti, Nb, Zr, and V: 0.001% to 0.4%, Cu+Ni: 0.005% to 2.0%, Sb+Sn: 0.001% to 1.0%, and B: 0.0001 to 0.01%.

13. The hot press formed member of claim 7 ,
wherein the steel sheet comprises a composition comprising, by wt %, carbon (C): 0.04% to 0.5%, silicon (Si): 0.01% to 2%, manganese (Mn): 0.01% to 10%, aluminum (Al): 0.001% to 1.0%, phosphorus (P): 0.05% or less, sulfur (S): 0.02% or less, nitrogen (N): 0.02% or less, and residual iron (Fe) and inevitable impurities.

14. The hot press formed member of claim 13 ,
wherein the composition of the steel sheet further comprises, by wt %, one or more among a sum of one or more selected from the group consisting of Cr, Mo, and W: 0.01% to 4.0%, a sum of one or more selected from the group consisting of Ti, Nb, Zr, and V: 0.001% to 0.4%, Cu+Ni: 0.005% to 2.0%, Sb+Sn: 0.001% to 1.0%, and B: 0.0001 to 0.01%.

15. The hot press formed member of claim 4 ,
wherein the steel sheet comprises a composition comprising, by wt %, carbon (C): 0.04% to 0.5%, silicon (Si): 0.01% to 2%, manganese (Mn): 0.01% to 10%, aluminum (Al): 0.001% to 1.0%, phosphorus (P): 0.05% or less, sulfur (S): 0.02% or less, nitrogen (N): 0.02% or less, and residual iron (Fe) and inevitable impurities.

16. The hot press formed member of claim 15 ,
wherein the composition of the steel sheet further comprises, by wt %, one or more among a sum of one or more selected from the group consisting of Cr, Mo, and W: 0.01% to 4.0%, a sum of one or more selected from the group consisting of Ti, Nb, Zr, and V: 0.001% to 0.4%, Cu+Ni: 0.005% to 2.0%, Sb+Sn: 0.001% to 1.0%, and B: 0.0001 to 0.01%.

17. The hot press formed member of claim 8 ,
wherein the steel sheet comprises a composition comprising, by wt %, carbon (C): 0.04% to 0.5%, silicon (Si): 0.01% to 2%, manganese (Mn): 0.01% to 10%, aluminum (Al): 0.001% to 1.0%, phosphorus (P): 0.05% or less, sulfur (S): 0.02% or less, nitrogen (N): 0.02% or less, and residual iron (Fe) and inevitable impurities.

18. The hot press formed member of claim 17 ,
wherein the composition of the steel sheet further comprises, by wt %, one or more among a sum of one or more selected from the group consisting of Cr, Mo, and W: 0.01% to 4.0%, a sum of one or more selected from the group consisting of Ti, Nb, Zr, and V: 0.001% to 0.4%, Cu+Ni: 0.005% to 2.0%, Sb+Sn: 0.001% to 1.0%, and B: 0.0001 to 0.01%.

Assignees

• Posco
• Posco Co Ltd

Inventors

• Kim Seong-Woo
• Oh Jin-Keun
• Cho A-Ra
• Shin Hyeon-Jeong

Classifications

• B32B15/012 Primary

  one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy · CPC title

• B21D22/02

  Stamping using rigid devices or tools · CPC title

• B21D22/022

  by heating the blank or stamping associated with heat treatment (C21D takes precedence) · CPC title

• B21D35/00 Primary

  Combined processes according to {or processes combined with} methods covered by groups B21D1/00 - B21D31/00 (B21D21/00 takes precedence) · CPC title

• B21D35/005 Primary

  characterized by the material of the blank or the workpiece (B21D26/053 takes precedence) · CPC title