Method for refining molten steel and apparatus therefor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 13, 2002
Grant Date -
N/A
app pub date -
Feb 15, 2001
filing date -
Jun 16, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method for refining molten steel by immersing the lower opening end of a cylindrical immersion tube equipped with a lance into the molten steel contained in a ladle, controlling the pressure in the cylindrical immersion tube to a prescribed pressure range to suck up the molten steel, injecting an agitation gas from the bottom of the ladle towards the surface of the sucked-up molten steel, and decarburizing and refining the molten steel under a reduced pressure, characterized in that the method comprising the steps of; controlling the pressure Pt (Torr) in the cylindrical immersion tube so as to satisfy the following formulae (1) and (2), blowing oxygen gas to the surface of the molten steel through the lance, and decarburizing and refining the molten steel under a reduced pressure; Pt>760-1.297.times.10.sup.7 /Dc.sup.2 (1) K=1.71.times.Dl.sup.0.211.times.Dc.sup.0.438.times.Wm.sup.-1.124.times.Qg. sup.0.519.times.Pt.sup.-0.410 >0.046 (2) wherein, K: capacity coefficient concerning the decarburizing reaction (l/min.) Dl: inner diameter of the ladle (cm) Dc: circle-reduced diameter of the cylindrical immersion tube (cm) Wm: mass of molten steel per processing (t) Qg: quantity of agitation gas injection (Nm.sup.3 /h.).
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully