US10023934B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10023934-B2 |
| Application number | US-201515120695-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 4, 2015 |
| Priority date | Mar 6, 2014 |
| Publication date | Jul 17, 2018 |
| Grant date | Jul 17, 2018 |
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The present disclosure relates to a high-strength hot-dip galvannealed steel sheet excellent in bake hardenability and bendability and having a component composition containing, in mass %, C: from 0.05 to 0.30%, Si: from 0.5 to 3.0%, Mn: from 0.2 to 3.0%, P: from 0 to 0.10%, S: from 0 to 0.010%, N: form 0 to 0.010%, and Al: from 0.001 to 0.10%, with the remainder being iron and unavoidable impurities. The steel sheet has a steel structure containing, in terms of area percentage, martensite: form 50 to 85% and ferrite: 0% or more and less than 5%, with the remainder being bainite. The steel sheet has a dislocation density of 5.0×1015 m−2 or more, a solute carbon amount of 0.08 mass % or more and a tensile strength of 1180 MPa or more.
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The invention claimed is: 1. A high-strength hot-dip galvannealed steel sheet excellent in bake hardenability and bendability, having a component composition comprising, in mass %: C: from 0.05 to 0.30%, Si: from 0.5 to 3.0%, Mn: from 0.2 to 3.0%, P: from 0 to 0.10%, S: from 0 to 0.010%, N: from 0 to 0.010%, Al: from 0.001 to 0.10%, and iron and unavoidable impurities, and having a steel structure comprising, in terms of area percentage: martensite: from 50 to 85% and ferrite: 0% or more and less than 5%, and bainite, and having: a dislocation density of 5.0×10 15 m −2 or more, a solute carbon amount of 0.08 mass % or more, and a tensile strength of 1180 MPa or more. 2. The high-strength hot-dip galvannealed steel sheet excellent in bake hardenability and bendability according to claim 1 , wherein the component composition further comprises, in mass %, one or two of: Cu: from 0.05 to 1.0%, Ni: from 0.05 to 1.0%, and B: from 0.0002 to 0.0050%. 3. The high-strength hot-dip galvannealed steel sheet excellent in bake hardenability and bendability according to claim 1 , wherein the component composition further comprises, in mass %, one or two of: Mo: from 0.01 to 1.0%, Cr: from 0.01 to 1.0%, Nb: from 0.01 to 0.3%, Ti: from 0.01 to 0.3%, and V: from 0.01 to 0.3%. 4. The high-strength hot-dip galvannealed steel sheet excellent in bake hardenability and bendability according to claim 2 , wherein the component composition further comprises, in mass %, one or two of: Mo: from 0.01 to 1.0%, Cr: from 0.01 to 1.0%, Nb: from 0.01 to 0.3%, Ti: from 0.01 to 0.3%, and V: from 0.01 to 0.3%. 5. The high-strength hot-dip galvannealed steel sheet excellent in bake hardenability and bendability according to claim 1 , wherein the component composition further comprises, in mass %, one or two of: Ca: from 0.0005 to 0.01% and Mg: from 0.0005 to 0.01%. 6. The high-strength hot-dip galvannealed steel sheet excellent in bake hardenability and bendability according to claim 2 , wherein the component composition further comprises, in mass %, one or two of: Ca: from 0.0005 to 0.01% and Mg: from 0.0005 to 0.01%. 7. The high-strength hot-dip galvannealed steel sheet excellent in bake hardenability and bendability according to claim 3 , wherein the component composition further comprises, in mass %, one or two of: Ca: from 0.0005 to 0.01% and Mg: from 0.0005 to 0.01%. 8. The high-strength hot-dip galvannealed steel sheet excellent in bake hardenability and bendability according to claim 4 , wherein the component composition further comprises, in mass %, one or two of: Ca: from 0.0005 to 0.01% and Mg: from 0.0005 to 0.01%. 9. The high-strength hot-dip galvannealed steel sheet excellent in bake hardenability and bendability according to claim 1 , having a steel structure comprising, in terms of area percentage: ferrite: 0% or more and less than 2%. 10. The high-strength hot-dip galvannealed steel sheet excellent in bake hardenability and bendability according to claim 1 , having a steel structure comprising, in terms of area percentage: martensite: from 60 to 80%. 11. The high-strength hot-dip galvannealed steel sheet excellent in bake hardenability and bendability according to claim 1 , having a steel structure comprising, in terms of area percentage: a dislocation density of 7.0×10 15 m −2 or more. 12. The high-strength hot-dip galvannealed steel sheet excellent in bake hardenability and bendability according to claim 1 , having a steel structure comprising, in terms of area percentage: a solute carbon amount of 0.1 mass % or more.
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