Slagging Spout for BOF Vessels | Basic Metal Manufacturing Component

Product Specifications

Technical details and manufacturing context for Slagging Spout

Definition

The slagging spout is a critical component of the Basic Oxygen Furnace (BOF) vessel that facilitates the controlled discharge of molten slag—a byproduct containing impurities like silica, phosphorus, and sulfur—after the oxygen blowing phase. It is strategically positioned to allow slag to flow out while minimizing the loss of molten steel, ensuring efficient separation and disposal of waste materials. The spout is typically constructed with a refractory-lined steel shell to withstand high temperatures and abrasive slag. Key parameters include a nominal diameter of 150–300 mm (ISO 1127), operating temperature range of 1200–1600°C, and operating pressure of 1.0–1.6 MPa. The refractory material is typically MgO-C (ASTM C467), with a lining thickness of 150–250 mm. The spout may be water-cooled, requiring a cooling water flow of 10–20 m³/h and pressure of 0.3–0.5 MPa. Sealing class ranges from IV to VI, and dimensional tolerance is ±0.5 mm (ISO 2768-m). Weight ranges from 500–1500 kg. These values are reference ranges and must be verified for the specific model and application. The spout's design ensures proper slag flow and minimizes steel loss, but its performance depends on correct installation, alignment, and maintenance. Regular inspection of the refractory lining and sealing surfaces is essential to prevent leaks and extend service life. The spout is a component of the BOF vessel and is not a standalone product; it must be integrated with the furnace system. Buyers should confirm all specifications with the manufacturer or supplier to ensure compatibility and compliance with relevant standards.

Working Principle

During the steelmaking process, after oxygen is blown into the molten iron to reduce carbon and impurities, the lighter slag floats on top of the molten steel. The furnace is tilted, and the slagging spout is aligned to allow the slag to flow out by gravity into a slag pot or conveyor system, while the heavier steel remains in the vessel. The spout's design and positioning are critical to ensure efficient slag removal without excessive steel loss. The refractory lining protects the spout from high temperatures and abrasive slag, while the sealing mechanism prevents leakage. The spout may be water-cooled to manage heat and extend refractory life. Proper operation requires careful control of furnace tilt angle and slag viscosity, which can be influenced by temperature and composition. The spout's capacity and flow rate are determined by its diameter and the slag's fluidity. Regular maintenance, including inspection of the refractory and seals, is necessary to ensure reliable performance and prevent premature failure.

Common Materials

Refractory-lined steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Nominal Diameter	150–300 mm	Determines slag flow rate and spout capacity.ISO 1127
Operating Temperature	1200–1600 °C	Above 1600°C refractory life is reduced.
Operating Pressure	1.0–1.6 MPa
Tolerance	±0.5 mm	Ensures proper sealing and alignment.ISO 2768-m
Refractory Material	MgO-C	Resists slag erosion and thermal shock.ASTM C467
Weight	500–1500 kg	Affects handling and installation.
Sealing Class	IV–VI	Higher class reduces slag leakage.
Lining Thickness	150–250 mm	Thicker lining extends service life.
Cooling Water Flow	10–20 m³/h	Required for water-cooled spouts.
Cooling Water Pressure	0.3–0.5 MPa	Maintains adequate cooling without leaks.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Refractory Lining Part
Protects the steel structure from high temperatures and corrosive slag

Material: Magnesia-carbon or alumina-based refractory
Steel Shell Part
Provides structural support and containment for the refractory lining

Material: Heat-resistant steel
Mounting Flange Part
Secures the spout to the BOF vessel structure

Material: Carbon steel
Sealing Mechanism
Closes the spout against leakage between taps.
Water Cooling System Optional
Carries heat out of the spout to extend refractory life, on water-cooled versions.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Basic Oxygen Furnace Vessel

View system integration details

Manufacturers of Slagging Spout

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Frequently Asked Questions

What is the function of a slagging spout?

The slagging spout is a component of a Basic Oxygen Furnace (BOF) vessel that allows controlled removal of molten slag after the oxygen blowing phase. It is positioned to let slag flow out by gravity while minimizing the loss of molten steel.

What materials are used in a slagging spout?

The spout is typically made of refractory-lined steel. The refractory material is often MgO-C (magnesia-carbon) as per ASTM C467, which resists slag erosion and thermal shock. The lining thickness ranges from 150 to 250 mm.

What are the key specifications to verify?

Key specifications include nominal diameter (150–300 mm), operating temperature (1200–1600°C), operating pressure (1.0–1.6 MPa), sealing class (IV–VI), and tolerance (±0.5 mm per ISO 2768-m). Always confirm these values with the manufacturer for your specific model.

How is the slagging spout maintained?

Regular inspection of the refractory lining and sealing surfaces is essential. Check for wear, cracks, or leaks. Ensure proper alignment and sealing to prevent slag leakage. Water-cooled spouts require monitoring of cooling water flow and pressure to maintain adequate cooling without leaks.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 0.5 bar gauge (slag flow induced pressure)
flow rate:	5-50 tons/min (slag removal rate)
temperature:	1400-1700°C (typical BOF operating range)
slurry concentration:	70-90% solids by weight (slag viscosity range)

Slagging Spout

Product Specifications

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