Steel Ladle Flow-Control Solutions

Ladle Slide Gate System

A refractory flow-control system designed to regulate steel transfer from the ladle to the tundish, minimize the risk of steel re-oxidation and support efficient ladle management during steel production.

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Flow Control Accurate regulation of steel flow from the ladle to the tundish

Re-oxidation Control A controlled discharge path that helps limit contact between molten steel and air

Ladle Efficiency Replaceable refractory components for efficient ladle operation and maintenance

$Ladle slide gate refractory components including well block, nozzles and slide gate plates$

Product Overview

Controlled Transfer of Molten Steel

The ladle slide gate system is installed beneath the ladle outlet and creates a controlled refractory passage between the molten steel and the tundish.

Relative movement between the refractory plates changes the overlap of their bore openings, allowing the flow path to be opened, restricted or closed.

The purging plug and housing block shown next to the outlet belong to a separate bottom-gas injection assembly.

Replaceable refractory components

Controlled ladle-to-tundish discharge

Slide-gate and gas-purging assemblies

Manufactured to customer drawings

Technical cross-section of ladle slide gate and purging systems — Technical arrangement of the ladle outlet slide gate and the adjacent purging-plug assembly.

Main System Tasks

Why the Ladle Slide Gate System Is Used

The slide gate is designed to control molten-steel discharge while supporting cleaner and more efficient ladle operation.

Adjust Steel Flow Regulates the flow of molten steel from the ladle to the tundish by changing the overlap of the refractory plate openings.

Minimize Re-oxidation Risk Supports a controlled steel-transfer path and helps reduce unwanted exposure of the molten stream to air.

Improve Ladle Management Replaceable refractory parts support efficient ladle operation, maintenance and production scheduling.

Four Core Refractory Components

The catalogue identifies the upper nozzle, upper sliding plate, lower sliding plate and lower nozzle as the four main refractory components of the slide gate. These parts may be manufactured by pressing or casting, using material systems such as alumina-carbon (ALU-C) and alumina-zirconia-carbon (ALU-ZIR-C), depending on the customer’s steelmaking requirements.

Upper Nozzle Upper Sliding Plate Lower Sliding Plate Lower Nozzle

System Components

Components Shown in the Ladle Diagram

Each component is presented separately below to make its shape, installation position and function easier to understand.

01 $Ladle well block refractory component$

Well Block

A refractory seating block installed in the ladle bottom around the steel outlet. It supports the upper nozzle, maintains alignment and protects the surrounding ladle lining.

Slide Gate Component

Upper Nozzle

Also called the inner nozzle, it is seated within the well block and transfers molten steel from the ladle interior to the slide-gate plate assembly.

Slide Gate Component

03 $Upper refractory slide gate plate$

Upper Plate

The upper refractory plate is located beneath the upper nozzle. Its bore forms the upper section of the controllable molten-steel flow passage.

Slide Gate Component

04 $Lower refractory slide gate plate$

Lower Plate

Relative movement between the plate openings changes the effective flow area, allowing the steel stream to be opened, throttled or completely stopped.

Slide Gate Component

Lower Nozzle

Also known as the collector nozzle, it is installed below the plates and guides the controlled molten steel stream toward the tundish or ladle shroud.

Slide Gate Component

06 $Ladle purging plug refractory component$

Purging Plug

A gas-injection refractory installed in the ladle bottom. It introduces controlled gas bubbles for stirring and temperature and composition homogenization.

Gas Purging Component

Housing Block

A refractory support block that holds and positions the purging plug, protects the ladle-bottom lining and facilitates plug installation and replacement.

Gas Purging Component

Refractory Material Selection

Material Suitability by Steel Composition

The catalogue matrix compares common slide-gate refractory compositions for several steel chemistries and treatment conditions.

Material selection depends on the interaction between the refractory and the molten steel, including calcium treatment, manganese, silicon, oxygen level and alloy content.

The table below reproduces the catalogue’s relative suitability guidance. It should be used as an initial selection tool rather than as a substitute for a manufacturer-approved technical recommendation.

ALU-C — Alumina-Carbon ALU-ZIR-C — Alumina-Zirconia-Carbon SPL-C — Spinel-Carbon MAG-SPL-C — Magnesia-Spinel-Carbon MAG-ALU-C — Magnesia-Alumina-Carbon MAG-C — Magnesia-Carbon Co-pressed Zirconia

Composition	Mild Steel (Carbon Steel)	Calcium-Treated Steel Above 30 ppm	High-Mn Steel Above 0.8%	High-Si Steel	High-O₂ Steel Above 30 ppm	High-O₂ & Mn Steel Above 30 ppm	Stainless Steel
ALU-C	✓	×	∞	✓	∞	∞	✓
ALU-ZIR-C	✓	×	×	✓	×	×	✓
SPL-C	✓	∞	✓	∞	✓	✓	×
MAG-SPL-C	✓	∞	✓	∞	✓	✓	×
MAG-ALU-C	✓	×	✓	×	✓	✓	×
MAG-C	✓	✓	✓	×	✓	✓	×
Co-pressed Zirconia	✓	✓	×	✓	×	×	×

✓ Most Suitable ∞ Suitable × Not Suitable

Final selection should also consider slide-gate model, plate/nozzle geometry, casting sequence, thermal cycling, expected service life and the steel producer’s operating practice.

Integrated Ladle Bottom

Two Different Systems in One Ladle

Both assemblies are installed in the ladle bottom, but one controls molten-steel discharge while the other injects gas into the melt.

Slide Gate Flow-Control System

Movement of the refractory plates controls the alignment and effective opening of the molten-steel discharge passage.

Well Block → Upper Nozzle → Gate Plates → Lower Nozzle

Ladle Purging System

The gas-purging assembly introduces controlled gas through a refractory plug positioned separately from the molten-steel outlet.

Gas Supply → Housing Block → Purging Plug → Molten Steel

Request a Ladle Slide Gate Quotation

Send us your slide-gate model, component drawings, dimensions, bore diameter, steel grade, required service life, quantity and destination country.

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