Slide gate plates are one of the most importantrefractory for continuous casting of steel and it is characterized by a preciseflow control and a safety operation.
In ladle service, slide gate plates areexposed to sudden thermal shock, physical abrasion by molten steel, as well asphysical and chemical corrosion by molten steel and slay. Therefore, thesepieces must have resistance to both thermal shock and corrosion. One of recenttendencies among slide gate plates damages is the increase of corrosion due tocasting of Ca-alloy treated or high oxygen steel.
The structure of slide gate plates greatlyinfluences the capacity and rate of steelmaking and has a big effect onsteelmaking cost. Then, according to the requirements of each steel shop, slidegate plates can be made of different material, such as alumina,Zirconia and Magnesia materials.
Al2O3-ZrO2-C slide gate plates
Al2O3-C slide gate plates
Al2O3-MgO-C slide gate plates
Al-Spinel-C slide gate plates
Spinel-C slide gate plates
MgO-Spinel-C slide gate plates
MgO-Al2O3-C slide gate plates
MgO-C slide gate plates
ZrO2 slide gate plates
The slide gate plates service performancedepends on steel composition, its temperature, speed, and casting time. Can choosethe quality depending on the steel making condition as below:
Quality | Mild Steel | Ca-treated steel | High Mn Steel | High Si Steel | High O2 steel | High O2 & Mn steel | Stainless steel |
|
| above 30PPM | Above 0.8% |
| Above 70PPM | Free cutting grade |
|
Al2O3-ZrO2-C | ○ | × | × | ○ | × | × | ○ |
Al2O3-C | ○ | × | ∞ | ○ | ∞ | ∞ | ○ |
Al2O3-MgO-C | ○ | × | ∞ | ○ | ∞ | ∞ | × |
Al-Spinel-C | ○ | × | ∞ | ∞ | ∞ | ∞ | × |
Spinel-C | ○ | × | ○ | ∞ | ○ | ○ | × |
MgO-Spinel-C | ○ | ∞ | ○ | ∞ | ○ | ○ | × |
MgO-Al2O3-C | ○ | ∞ | ○ | ∞ | ○ | ○ | × |
MgO-C | ○ | ○ | ○ | × | ○ | ○ | × |
ZrO2 | ○ | ○ | × | ○ | × | × | × |
○=Most suitable , ∞=Suitable, ×=Not Suitable |