INDUSTRY COMPONENT

Slag Door

A heavy-duty door on an electric arc furnace for controlled slag removal during steel production.

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Component Specifications

Definition
The slag door is a critical component of an electric arc furnace (EAF) designed to facilitate the controlled removal of slag—a byproduct of the steelmaking process consisting of impurities, oxides, and fluxes. It is typically located on the side of the furnace shell and operates through hydraulic or mechanical mechanisms to open and close, allowing operators to tap slag into slag pots or ladles without interrupting the melting process. The door must withstand extreme temperatures (up to 1600°C), thermal cycling, and mechanical stress from slag flow and furnace tilting.
Working Principle
The slag door operates by using hydraulic cylinders or mechanical linkages to pivot or slide open, creating an aperture for slag to flow out of the furnace. During steelmaking, slag accumulates on the molten metal surface; by tilting the furnace and opening the door, slag is gravity-drained. The door seals tightly when closed to contain heat and prevent air ingress, maintaining furnace efficiency and safety. Advanced systems may include water-cooled panels or refractory linings to manage thermal loads.
Materials
High-temperature steel alloys (e.g., ASTM A297 HK or HP grades), often with refractory linings (e.g., magnesia-carbon or alumina-based bricks) and water-cooled copper or steel panels for enhanced durability. Hinges and mechanisms use heat-resistant alloys.
Technical Parameters
  • Actuation Hydraulic or mechanical
  • Door Size Typically 0.5m to 1.5m wide
  • Sealing Type Refractory or metal-to-metal seal
  • Cooling System Optional water-cooled design
  • Pressure Rating Designed for furnace internal pressures up to 0.5 bar
  • Operating Temperature Up to 1600°C
Standards
ISO 13579, DIN 7526

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Slag Door.

slag door electric arc furnace EAF component steelmaking equipment slag removal industrial furnace parts Slag Door in Basic Metal Manufacturing

Parent Products

This component is used in the following industrial products

Electric Arc Furnace

A furnace that melts scrap steel or direct reduced iron using an electric arc to produce liquid steel.

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Engineering Analysis

Risks & Mitigation
  • Thermal stress cracking
  • Refractory erosion
  • Hydraulic system failure
  • Slag spillage hazards
FMEA Triads
Trigger: Refractory lining degradation due to thermal cycling
Failure: Door leakage leading to heat loss and safety risks
Mitigation: Implement scheduled refractory inspections and replacements; use high-quality materials.
Trigger: Hydraulic actuator malfunction
Failure: Inability to open or close door, disrupting operations
Mitigation: Regular maintenance of hydraulic systems; install backup actuators or manual overrides.
Trigger: Improper slag viscosity or flow
Failure: Slag buildup or blockages at the door
Mitigation: Monitor slag composition; adjust furnace parameters; use slag conditioners.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Door alignment within ±5mm; sealing gap <2mm under operating conditions
Test Method
Pressure testing, thermal cycling tests, and non-destructive inspection (e.g., ultrasonic) per ISO 13579

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

Related Components

Refractory Liner
Refractory liner for molten metal flow control valves, providing thermal insulation and erosion resistance in extreme temperature applications.
Rotary Impeller
A high-speed rotating impeller used in molten metal degassing systems to inject inert gases and remove impurities.
Probe Assembly
High-temperature sampling probe for molten metal composition analysis in metallurgical processes
Level Sensor
Level sensor for continuous monitoring of molten metal height in industrial furnaces and casting systems.

Frequently Asked Questions

What is the purpose of a slag door in an electric arc furnace?

It allows controlled removal of slag, a waste byproduct, during steel production to maintain furnace efficiency and product quality.

How does a slag door handle high temperatures?

It uses heat-resistant materials like refractory linings and water-cooled panels to withstand temperatures up to 1600°C.

What maintenance is required for slag doors?

Regular inspection for refractory wear, seal integrity, and hydraulic system checks to prevent failures and ensure safe operation.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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