Ladle & Converter Purging Plugs — Slit and Porous Designs

Purging plugs are the interface between the gas system and the steel, and they are specified by duty more than by chemistry. Get the geometry wrong and the stirring does not work, regardless of how good the refractory is.

Slit or Porous: Choose by Duty

• Slit-type — directional, higher-volume flow. Suits vigorous stirring and long treatment times. More robust mechanically, and the usual choice for demanding LF and CAS-OB duty.
• Porous — finer, more uniform bubble dispersion. Better for inclusion flotation and gentle stirring, but more sensitive to thermal and mechanical shock.

If your priority is mixing energy and campaign length, use slit. If it is cleanliness through fine bubble dispersion, use porous. Running one type everywhere is a compromise that usually costs you something in both directions.

Why the Seat Matters More Than People Expect

The well block and seat are where plug problems actually begin. A plug that does not seat correctly leaves a path for steel to penetrate around it — which is a performance failure first and a safety concern second. It is also one of the most avoidable problems in the ladle, because the fix is dimensional.

We supply plug and well block as a matched set with the interface machined to your drawing, so the assembly fits rather than being persuaded to fit on site.

Three Causes of Premature Failure

In order of how often we see them:

• Erosion — from excessive gas flow or stirring intensity beyond what the plug design carries.
• Thermal shock — from rapid heating or cooling between heats, particularly on a cold plug going into a hot ladle.
• Steel penetration — through an ill-fitting seat or a worn well block.

Each has a different fix, so diagnosing the actual mechanism is worth doing before changing the plug specification. We will help with that from photographs of the worn plug.

Supply

Quoted per set, typically 50–200 pieces minimum, 20–35 days from drawing approval. Gas flow characteristics are verified before shipment, and dimensional inspection reports and batch test data accompany every order.

Where This Grade Sits in the Lining System

Flow-control refractories are consumed on the caster's schedule, so the specification is as much about dimensional repeatability and interchangeability with your existing mechanism as it is about composition. A plate or shroud that fits but varies by a millimetre between lots costs more in breakouts than it saves in unit price.

XZK supplies purging plug as one zone of a zoned package rather than as a standalone item: the grades normally zoned alongside it — among them well block (seat brick) — are documented on the continuous casting functional refractories page, and the vessel-level architecture — where each zone starts and ends, and which mechanism actually limits the campaign — is set out on the steel ladle and RH/VD and BOF converter pages.

Campaign data measured on this class of lining — including the wear profile that drove grade selection — is published in the JFE Steel RH degasser snorkel and ladle flow control programme project reference.