CN103031411A - Method for relieving slag bonding for insertion tube of vacuum chamber - Google Patents

Abstract

The invention relates to a method for relieving slag bonding for an insertion tube of a vacuum chamber. The method comprises the following steps of: 1) controlling the tapping temperature of a converter to be 1700-1710 DEG C, and controlling the tapping time to be more than 6 minutes; 2) adding fluorite during the tapping process of the converter, blowing argon and stirring after tapping; 3) controlling the temperature to be more than 1590 DEG C when the molten steel enters a vacuum refining furnace, variably controlling immersion depth of the insertion tube in the molten steel, namely, and increasing the immersion depth of the insertion tube in each tank by 20-50mm based on that in previous tank until the end of casting treatment; 4) controlling the treatment time of the vacuum refining furnace to be 15-22 minutes; and 5) treating the molten steel in a steel ladle refining furnace LF, and correspondingly reducing addition of the slag-making fluorite by 0.5-1.5kg per ton of steel. The method has the advantages of effectively relieving the slag bonding degree of the insertion tube, stabilizing the treatment on molten steel and guaranteeing the continuous and steady production.

Description

A kind of method of alleviating the slagging scorification of vacuum chamber tubular stinger

Technical field

The present invention relates to a kind of method of alleviating the slagging scorification of vacuum chamber tubular stinger.

Background technology

When smelting high-grade pipe line steel behind the converter tapping, molten steel will be processed through vacuum refining furnace, because the manganese alloy generation oxidation that converter boiling tapping adds, cause the interior slag of ladle to flow relatively poor, when molten steel ladle top slag when vacuum refining furnace is processed contacts with the vacuum chamber tubular stinger, cause vacuum chamber tubular stinger dry slag serious, affect follow-up steel treatment.

Summary of the invention

For overcoming the deficiencies in the prior art, the purpose of this invention is to provide a kind of method of alleviating the slagging scorification of vacuum chamber tubular stinger, alleviate the slagging scorification of vacuum chamber tubular stinger, the stabilized steel water treatment.

For achieving the above object, the present invention is achieved through the following technical solutions:

A kind of method of alleviating the slagging scorification of vacuum chamber tubular stinger may further comprise the steps:

1) Tapping Temperature of Bof is controlled at 1700～1710 ℃, and the tapping time is controlled at more than the 6min;

2) converter tapping process adds fluorite 0.5～1.5kg/t steel, and Argon stirs 3～5min after the tapping, and flow control is at 50～90Nm ³/ h;

3) molten steel advances the vacuum refinement furnace temperature and is controlled at more than 1590 ℃, and tubular stinger immerses the molten steel degree of depth to be adopted and deepen control, and namely the every tank of immersion depth increases by 20～50mm on the basis of front tank, finishes until originally water time processing;

4) the vacuum refining furnace treatment time is controlled at 15～22min;

5) molten steel advances ladle refining furnace LF processing, the corresponding minimizing 0.5～1.5kg/t of slag making fluorite add-on steel.

Compared with prior art, the invention has the beneficial effects as follows:

Effectively alleviated the degree of tubular stinger slagging scorification, the stabilized steel water treatment has guaranteed continuous and stable production.

Embodiment

The below describes in detail the present invention, but should be noted that enforcement of the present invention is not limited to following embodiment.

A kind of method of alleviating the slagging scorification of vacuum chamber tubular stinger may further comprise the steps:

1) Tapping Temperature of Bof is controlled at 1700～1710 ℃, and the tapping time is controlled at more than the 6min;

2) converter tapping process adds fluorite 0.5～1.5kg/t steel, and Argon stirs 3～5min after the tapping, and flow control is at 50～90Nm ³/ h;

3) molten steel advances the vacuum refinement furnace temperature and is controlled at more than 1590 ℃, and tubular stinger immerses the molten steel degree of depth to be adopted and deepen control, and namely the every tank of immersion depth increases by 20～50mm on the basis of front tank, finishes until originally water time processing;

4) the vacuum refining furnace treatment time is controlled at 15～22min;

5) molten steel advances ladle refining furnace LF processing, the corresponding minimizing 0.5～1.5kg/t of slag making fluorite add-on steel.

The degree of tubular stinger slagging scorification has effectively been alleviated in the present invention, and the stabilized steel water treatment has guaranteed continuous and stable production.

Claims (1)

1. a method of alleviating the slagging scorification of vacuum chamber tubular stinger is characterized in that, may further comprise the steps:

1) Tapping Temperature of Bof is controlled at 1700～1710 ℃, and the tapping time is controlled at more than the 6min;

2) converter tapping process adds fluorite 0.5～1.5kg/t steel, and Argon stirs 3～5min after the tapping, and flow control is at 50～90Nm ³/ h;

3) molten steel advances the vacuum refinement furnace temperature and is controlled at more than 1590 ℃, and tubular stinger immerses the molten steel degree of depth to be adopted and deepen control, and namely the every tank of immersion depth increases by 20～50mm on the basis of front tank, finishes until originally water time processing;

4) the vacuum refining furnace treatment time is controlled at 15～22min;

5) molten steel advances ladle refining furnace LF processing, the corresponding minimizing 0.5～1.5kg/t of slag making fluorite add-on steel.