Steel sheet excellent in ductility and strength stability after heat treatment
AssigneeKobe Steel, Ltd.
InventorsTatsuya Asai, Tetsuo Soshiroda
Life of this patent
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Abstract
There is provided a steel sheet which can simultaneously achieves the following objects: high strength is obtained by quenching with reliability; and excellent ductility is ensured, and further which is excellent in corrosion resistance, plating properties, and spot weldability. The steel sheet is so configured as to satisfy the following composition requirements: on a mass basis, C: 0.11 to 0.22%, Mn: 0.1 to less than 0.5%, Cr and/or Mo: a total amount of 0.1 to 0.5%, and B: 0.0005 to 0.005%, where C: the content of C (% by mass), Cr: the content of Cr (% by mass), and Mo: the content of Mo (% by mass), wherein T≧0.19 where T=C+(Cr+Mo)/5.
Claims12
A steel sheet excellent in ductility and strength stability after a heat treatment, comprising:
- by mass,
- C:
- 0.11 to 0.22%,
- Mn:
- 0.1 to less than 0.5%,
- Cr and/or Mo:
- a total amount of 0.1 to 0.5%, and
- B:
- 0.0005 to 0.005%,
- where C:
- the content of C (% by mass), Cr:
- the content of Cr (% by mass), and Mo:
- the content of Mo (% by mass),
- wherein T≧0.19 where T=C+(Cr+Mo)/5.
Dependencies are inferred from the claim text.