In steel production, converters (such as the Basic Oxygen Furnace or BOF) play a vital role in refining molten iron into steel. Operating under extremely high temperatures, heavy mechanical movement, and exposure to dust and gases, these systems demand reliable sealing elements that can cope with intense working environments.
So, what kind of seals are suited for converters in a steel plant?
Main Sealing Zones in a Converter
Steel converters involve several areas
where seals are essential:
Trunnion bearings: These support the tilting motion of the converter and require seals to retain lubrication and block contaminants.
Hydraulic cylinders: Used to control tilt and locking mechanisms; these systems need pressure-resistant dynamic seals.
Gas hoods and ducts: Require sealing materials that can withstand high-temperature exhaust and dust particles.
Cooling systems: May involve water circuits that need chemical- and heat-resistant seals.
Recommended Seal Types and Materials
High-temperature-resistant rotary
seals: Especially in the trunnion area, materials like PTFE with stainless steel
springs are commonly used.
Fabric-reinforced seals: Provide good mechanical strength and flexibility for dynamic applications like tilt control.
Elastomeric O-rings or rod seals (HNBR, FKM): Used in hydraulic actuators operating in high-pressure conditions.
Graphite or ceramic seals: Found in stationary hot zones, where thermal
endurance is essential.
Frequently Considered Questions
Q1: Can the same seal type be used
throughout the converter system?
Not ideally. Each zone presents different
challenges—heat, motion, or fluid pressure. Using application-specific materials
helps maintain performance and reduces maintenance needs.
Q2: How does dust and slag affect seal life?
Dust and slag can accelerate
wear on seals, especially in exposed moving parts. This is why seals with
abrasion-resistant coatings or multiple-lip designs are often used near
slag-handling areas.
Q3: Are these seals off-the-shelf or custom-designed?
Some are available
in standard sizes, but most seals in converter systems are custom-tailored to
fit exact tolerances and resist local operating conditions.
Choosing seals for converter systems isn’t just about materials—it’s about matching function, resistance, and movement. Partnering with suppliers experienced in seals environments ensures a more reliable solution, customized for the harsh conditions of modern steel production.
