Title:
MANUFACTURE OF OXIDE DISPERSED STEEL
Document Type and Number:
Japanese Patent JP3297699
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method of manufacture of an oxide-dispersed steel, where the dispersion density of oxides including Al-Mn type oxides is controlled with high precision.
SOLUTION: Si concentration and Mn concentration are regulated in a ladle, and a prescribed amount of oxygen is blown while adding a slagging agent and Si and heating is performed to form a CaO-SiO2-Al2O3-MgO type slag having a composition in the range where the value of CaO/SiO2 is regulated to 0.8-4 and the amounts of Al2O3 and MgO are regulated to 3-40 wt.% and 5-20 wt.% (where the weight percentage of each oxide means its concentration in the slag), respectively. Simultaneously, after control into a molten steel where the amounts of Al and total oxygen in the molten slag are regulated to 0.0001-0.003 wt.% and 0.002-0.01 wt.%, respectively, Si concentration is regulated again to 0.05-0.2 wt.% and gas bubbling and vacuum degassing treatments are performed. In this manufacturing method, Ti or/and Zr are added independently or in combination in the course of the vacuum degassing treatment.
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Inventors:
Takayuki Nishi
Hiroaki Yamazoe
Hiroaki Yamazoe
Application Number:
JP16689597A
Publication Date:
July 02, 2002
Filing Date:
June 24, 1997
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES,LTD.
International Classes:
C21C7/04; C21C7/10; C22C33/04; (IPC1-7): C21C7/10; C21C7/04; C22C33/04
Domestic Patent References:
| JP813024A | ||||
| JP892629A | ||||
| JP6330146A | ||||
| JP2194115A |
Attorney, Agent or Firm:
Morio Mori (1 outside)