Argon Insert Upper Nozzles for Tundish of Slab Caster

Basic Info
Core Highlights
FAQ
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Basic Info

Items		Body	Bowl part
Items		Alumina-Graphite	Alumina-Graphite	Magnesia-Graphite
Chemical Composition ( % )	Al2O3	≥50	≥75	---
	C+SiC	≥25	---	≥75
	ZrO2		≥10	≥10
Bulk Density (g/cm³)		≥2.45	≥2.75	≥2.70
Apparent Porosity(%)		≤18	≤16	≤16
Cold Crushing Strength(MPa)		≥20	≥25	≥20
Modulus of Rupture-Room Temp(MPa)		≥7	≥7.0	≥5.0
Thermal Shock Resistance (sequence)		≥5	≥5

Core Highlights

1.The flange adopts zirconia compound materials,better anti-corrosion property,better cooperation with stoppers and also easy for flow control.

2.Porous material and argon insert which prevent from build up of Al2O3.

3.Argon insert graphite mouth.

4.Sliding plate ensures perfect seal and quick-exchange.

5.Argon insert slot.

FAQ

Q: Slow Heat Conduction

A: 1. Not preheating according to the standard procedure.
2. Slag influences heat conduction.
3. The crucible has reached its service life.
Q: Crucibe corrosion

A: 1. Adding flux before metal is molten or excessive use of flux.
2. Certain fluxes contain corrosion substances.
3. Fuel containing corrosive substance.
4. Abnormal high-temperature operation may result in glaze layer smelting resembling corrosion.
Q: Top problems

A: 1. Repeatedly top impacted on top area cause oxidation.
2.Slags accumulated arround the top area or between the top area and the furnace cover.
3.Small gape between the top and the furnace cover. 4. Low temperature on top area.
5. Contacting with some matels with lager heat exchanging coefficients.
6. Excentral installation cause not enough space between the top and furnace.
Q: Excessive oxidation

A: 1. Flame in furnace against the bottom of the crucible directly.
2. Low temperature in the top area. 3.Overheated working temperature.
4. Hoisting or moving improperly damages glaze layer.
5. The emergent drain hole is open.
Q: Explosion

A: 1.Heating rapidly while the crucible has damped during transportation or storage.
2. Over rapid heating-up during preheating procedure.
3. The added materials are not completely dried.
Q: Middle or bottom craks

A: 1.Impacted during transportation or installation.
2. Crucible should be placed in the middle of the furnace stack smoothly and stably.
3. An improper graphite stand is used.
4. The existence of great thermal difference in the furnace.
5.Matel ingots in the crucible filled horizontally or diagonally.Metal materials overfilled.
6. Leftover slag or molten matal in the crucible.

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