To provide a method for manufacturing a steel for high strength steel wire rod excellent in cold wire-drawability.
When the steel for high-strength steel wire rod satisfying the specified component-composition, an alumina-based material is used as the inner wall material in a ladle which is used after secondary refining, and corresponding to C content: [C] (mass%) in the steel, the operation is performed under the following conditions: (1) in the case of being 0.7%[C]0.8%, the slag-off operation is performed before the secondary refining, and the slag quantity is controlled to be 7.5 kg/t; (2) in the case of being 0.8%[C]0.9%, the ladle, in which a steel kind receiving the molten steel in the last time is [Al]0.015%, is used, and the slag-off operation is performed before secondary refining and the slag quantity is controlled to be 1.5 kg/t; and (3) in the case of being 0.9%[C]1.0%, the ladle in the first time of receiving the molten steel or the ladle receiving the molten steel the kind of which is same as that of the molten steel received in the last time is used, and the slag-off operation is performed before the secondary refining and the slag-off quantity is controlled to be 1.5 kg/t and further, the basicity of slag after the secondary refining is controlled to be 1-2.
MINAMIDA TAKAAKI
| JP2000178685A | 2000-06-27 | |||
| JPH04110413A | 1992-04-10 | |||
| JPH08225820A | 1996-09-03 | |||
| JPH10130714A | 1998-05-19 |
Tadashi Sugakawa
Hiroaki Ito
Hisahiko Ueki