坑井ブロック耐火物

Description of Well Block Refractory

Refractory well blocks play a vital role in the continuous casting process in the steel industry. Made from carefully selected refractory materials, they are able to withstand extreme conditions. Well block refractory is mainly made of materials such as high – alumina, magnesia – aluminum spinel, and refractory castables. The specific refractoriness can be adjusted by changing the composition and proportion of raw materials according to different application requirements. For example, well block refractory with a higher alumina content generally has a higher refractoriness.

Technique Data of Kerui Well Block Refractory

Difference	Tundish Well Block	Ladle Well Block
所在地	Bottom of the tundish	Bottom of the ladle
Primary Function	Controls the flow rate of molten steel into the mold and improves steel cleanliness	Controls the flow rate of molten steel from the furnace into the ladle and, in some cases, adjusts the steel composition
Operating Stage	Continuous casting process	Steelmaking and teeming process

Category	Technical Specification	Description
Dimensions	230 × 114 × 76 mm (standard)	Customizable according to furnace design, ±2 mm tolerance
Material Type	High-alumina refractory brick (Al₂O₃ ≥ 48%)	Options: standard high-alumina, magnesia-alumina, zircon bricks, etc.
Density	2.2–2.6 g/cm³	High-density bricks have better wear resistance; low-density bricks provide better insulation
Water Absorption	≤ 6%	Lower water absorption improves durability
Compressive Strength	≥ 80 MPa	Maintains load-bearing capacity under high temperature
Flexural Strength	≥ 20 MPa	Resistant to thermal stress and mechanical impact
屈折率	1600–1800 ℃	Does not soften or crack
耐熱衝撃性	≥ 20 cycles	No cracking under repeated heating and cooling
Thermal Conductivity	1.0–2.0 W/m·K	Selectable for insulation or heat conduction
化学組成	Al₂O₃: 48–60%, SiO₂: 30–45%, Fe₂O₃ ≤ 2%, CaO+MgO ≤ 3%	Acidic/alkaline properties adjustable according to requirements
Firing Condition	Fully sintered	Enhances strength and durability
Surface Accuracy	Flatness ≤ 1.0 mm	Ensures construction precision and reduces gaps

価格

Advantages of Well Block Refractory

Exceptional Heat Resistance

It can endure extremely high temperatures, often up to 1770 – 2000°C, making it suitable for use in intense heat environments like steel – making furnaces and glass melting pots.

Outstanding Chemical Stability

Resistant to chemical corrosion from various substances, whether it’s the acidic or alkaline media in industrial processes. This property ensures long – term service in chemical plants and petrochemical reactors.

高い機械的強度

It has sufficient strength to withstand mechanical stress, abrasion, and thermal shock. This allows it to maintain its structural integrity in equipment with frequent temperature fluctuations and mechanical impacts, such as cement rotary kilns.