Monoblock Stoppers

Monoblock Stoppers

Product Description

The integral stopper rod is formed by isostatic pressing, and its shape and size depend on the capacity of the tundish, the molten steel level, and the shape and orifice size of the tundish. Installed inside the tundish, it controls the molten steel flow, acting as a "valve" for the steel flow during the casting process. Made from high-quality white fused alumina, flake graphite, and other raw materials through scientific formulation and strict processes, it possesses reliable thermal shock stability and excellent resistance to corrosion, erosion, and oxidation.

Applicable Industries: Steel Industry

Application: Molten Steel Flow Control

Packaging: Inner plastic bag packaging, outer wooden crate packaging

Factory Visit: Factory visits are welcome

Specifications: Multiple specifications available, customization supported

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Basic Info
Core Highlights
FAQ
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Basic Info

ltem		Body	Stopper Rod
ltem		Body	Alumina-Graphite	Magnesia-Graphite
Chemical Composition(%)	Al203	≥45	≥75	---
	Mgo	---	---	≥75
	C+SiC	≥25	≥10	≥10
Bulk Density(g/cm3)		≥2.5	≥275	≥2.7
Apparent Porosity(%)		≤20	≤16	≤16
Cold Crushing Strength(MPa)		≥20	≥25	≥20
Modulus of Rupture-Room Temp(MPa)		≥7	≥7	≥5
Thermal shock resistance(sequence)		≥5	≥5

Core Highlights

1. Sealing gasket

2. Steel nut connection to prevent stopper rod from falling off

3. One-piece aluminum-carbon material for reliable thermal shock resistance and durability

4. Anti-oxidation coating to prevent product oxidation

5. Vent plug for uniform airflow and to prevent molten steel from entering the stopper rod

6. Rod head made of composite material for greater erosion resistance

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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