Ladle purge plug (corundum-spinel type) blowing argon at ladle bottom features high and stable permeability, high strength, excellent erosion and thermal shock resistance, homogenizing steel composition and removing inclusions in ladle refining.
| Al2O3 content (corundum type) | ≥ 92% |
|---|---|
| MgO content (spinel type) | 6%～10% |
| Bulk density | ≥ 3.0 g/cm³ |
| Apparent porosity | ≤ 16% |
| CCS | ≥ 50 MPa |
| Permeability (0.2 MPa) | 100～600 Nl/min（按设计） |
| Refractoriness | ≥ 1790℃ |
| Service temperature | ≥ 1650℃ |
Ladle purge plug (purge plug, argon blowing plug) is a functional refractory element installed in the well block at the ladle bottom. Argon (or nitrogen) is blown through the plug into molten steel to create stirring currents inside the ladle, homogenizing steel composition and temperature and promoting inclusion removal. The plug is installed in the bottom working lining under severe service conditions: it must maintain stable permeability while resisting molten steel erosion, thermal shock and mechanical stress. Henan Songrui New Refractory Materials Co., Ltd. produces slit-type (directional slit) and diffuse-type (micro-pore) purge plugs made from corundum, spinel and other quality raw materials fired at high temperature, with designable permeability, high strength and long service life.
Slit-type uses directional slits for high permeability and strong stirring, suitable for high-flow bottom blowing; diffuse-type uses micro-pores for fine bubbles and gentle stirring, suitable for clean steel refining. Select by process requirement.
Blow back (instant high gas flow) can clear the channels; anti-penetration pore design significantly reduces blockage. Replace the plug when permeability decays to the lower limit.
Argon is inert and does not react with steel. Bottom stirring homogenizes composition and temperature and promotes inclusion collision and flotation, making it a key practice in ladle refining.
Yes. Henan Songrui New Refractory Materials Co., Ltd. customizes plug type, permeability and dimensions by ladle capacity, well block structure and refining process.
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