It mainly applied to Continuous casting mould
PRODUCTS
Guoliang company owns three wholly-owned subsidiaries and one branch. It is a high-tech enterprise specializing in the integrated solution of refractories for high-temperature industry, providing customers with general contracting services and refractory products.
Mold powder is a synthetic slag that covers the molten steel surface in the mould during the casting process, stabilizes the casting operation and improves the surface quality of the slab.
Different mold powder grades are available for ultra-low carbon steel, carbon steel, low-alloy steel and high-carbon steel. Selection should be based on steel grade, casting section, casting speed, operating temperature and required heat-transfer and lubrication characteristics.
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PRODUCT FUNCTION
Insulating the molten steel surface of the mould to avoid solidification of molten steel
Insulating air to prevent secondary oxidation of molten steel
Absorbing the inclusions floating in the molten steel, purifying the molten steel
Forming a slag film between the solidified shell and the inner wall of the mould to achieve good lubrication
Improving heat transfer between the mould and the shell to prevent surface cracks
TECHNICAL SPECIFICATIONS
|
Type |
BST-DB |
BST-PB |
BST-ZB |
BST-GB |
|
Moisture % |
<0.5 |
<0.5 |
<0.5 |
<0.5 |
|
Particle size % |
0.15~1mm>90 |
0.15~1mm>90 |
0.15~1mm>90 |
0.15~1mm>90 |
|
CaO/SiO2 |
0.8~1.1 |
1.1~1.45 |
1.0~1.3 |
0.7~1.0 |
|
Hemisphere point |
1050~1150℃ |
1050~1200℃ |
1050~1180℃ |
950~1100℃ |
|
1300℃melting speed |
25~50 S |
25~50 S |
25~50 S |
25~50 S |
|
1300℃viscosity |
0.15~0.55Pa.s |
0.08~0.25Pa.s |
0.1~0.3Pa.s |
0.08~0.20Pa.s |
|
Volume weight |
0.60~0.85g/cm³ |
0.50~0.90g/cm³ |
0.50~0.90g/cm³ |
0.50~0.80g/cm³ |
|
Applicable section |
(150~250) mm X (800~1600) mm |
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|
Applicable casting speed |
0.7~2.2m/min |
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Note: BST-CDB is applied to ultra low carbon steel series C ≤0.05%, BST-DB is applied to ultra low carbon steel series C<0.08%, BST-ZB is applied to carbon steel, low alloy and other steel grades with a carbon content of 0.08~0.35%, BST-GB is applied to High carbon steel series C ≥0.35%
During continuous casting, mold powder is continuously added to the top surface of molten steel in the mold. As it is heated, different functional layers develop between the powder bed, liquid slag and molten steel.
The resulting mold flux system performs several important functions:
Proper melting and infiltration are particularly important because the liquid mold flux must enter the gap between the solidifying shell and the mold wall to provide effective lubrication.
Viscosity is one of the most important parameters when selecting mold flux powder for continuous casting.
If viscosity is too high, liquid slag may not infiltrate the mold gap easily enough, potentially reducing lubrication.
If viscosity is too low for the specific casting conditions, slag behavior and heat-transfer characteristics may not match the required process.
GUOLIANG's current mold powder grades provide different 1300°C viscosity ranges to support different steel grades and casting conditions.
When comparing mold powder products, viscosity should therefore be evaluated together with:
The mold powder must melt at a suitable rate to maintain an adequate liquid slag pool during continuous casting.
If the powder melts too slowly, insufficient liquid slag may be available for infiltration and lubrication. If its melting behavior is unsuitable for the casting conditions, slag-layer stability may also be affected.
GUOLIANG BST series mold powders are designed with controlled melting characteristics for different continuous casting requirements.
The correct melting behavior should maintain a balance between:
Powder Supply → Melting → Liquid Slag Formation → Mold Gap Infiltration → Lubrication & Heat Transfer
Different steel grades have different solidification characteristics and therefore require different mold flux properties.
Mold powder for ultra-low carbon steel should be selected according to the specific carbon content, casting speed and slab requirements. Stable lubrication and appropriate heat-transfer characteristics are important for consistent casting.
For conventional carbon steel continuous casting, mold powder composition and viscosity should be matched to the steel carbon range, strand section and casting conditions.
Low-alloy steel mold flux should provide stable melting, lubrication and heat transfer while remaining compatible with the specific steel chemistry and casting process.
High-carbon steel has different solidification behavior from low-carbon grades. A suitable high-carbon steel mold powder should therefore be selected according to carbon content, casting speed and required shell formation characteristics.
GUOLIANG currently offers different BST series grades for these steel categories.
Mold powder selection should also consider the shape and dimensions of the continuous casting section.
Typical applications can include:
GUOLIANG's current BST series is specified for casting sections of approximately 150–250 mm × 800–1600 mm and casting speeds of 0.7–2.2 m/min.
For casting machines outside these ranges, actual operating data should be provided for product evaluation.
Choosing mold powder only according to steel grade is usually not sufficient. Buyers should consider the complete casting process.
Carbon content and alloy composition affect solidification behavior and therefore influence the required mold flux properties.
Higher or lower casting speeds change the required rate of slag consumption and infiltration between the strand and mold.
Slab thickness, width and strand geometry influence heat-transfer requirements and mold powder consumption.
Mold design, oscillation conditions and cooling intensity should be considered when evaluating lubrication and heat transfer.
If replacing an existing mold powder, it is useful to identify the current problem, such as:
This information allows the mold powder formulation to be evaluated against actual operating conditions.
GUOLIANG supplies mold powder and metallurgical auxiliary materials for continuous casting steel plants. Different mold flux grades can be selected according to steel carbon content, casting section, casting speed and required operating characteristics.
For steel plants seeking to replace an existing mold powder or improve casting stability, GUOLIANG can evaluate the current powder specification together with actual casting conditions to recommend a suitable product.
Mold powder is a synthetic metallurgical flux added to the molten steel surface inside a continuous casting mold. It melts during casting and helps provide thermal insulation, protection against reoxidation, inclusion absorption, lubrication and controlled heat transfer.
In continuous casting applications, mold powder, mould powder, mold flux, mould flux and casting powder are commonly used to describe this type of metallurgical auxiliary material.
Its main purposes are to protect and insulate the molten steel surface, absorb inclusions, lubricate the strand shell and control heat transfer between the solidifying steel and copper mold.
Selection should consider steel grade, carbon content, casting section, casting speed, mold conditions, required viscosity, melting behavior and current casting performance.
Mold powder influences lubrication and mold heat transfer, both of which are closely related to stable shell formation. However, strand surface quality also depends on casting speed, mold oscillation, steel chemistry, cooling and other operating factors.
Yes. GUOLIANG currently offers different BST series grades covering ultra-low carbon steel, carbon and low-alloy steel, and high-carbon steel applications.
Send us your steel grade, carbon content, casting section, casting speed and current mold powder specification. GUOLIANG can evaluate your continuous casting conditions and recommend a suitable mold powder grade for quotation and trial.Inquire Mold Powder now
|
Type |
BST-FJ-1 |
BST-FJ-2 |
BST-FJ-3 |
BST-FJ-4 |
|
Moisture % |
<0.5 |
<0.5 |
<0.5 |
<0.5 |
|
Particle size % |
0.15~1mm>90 |
0.15~1mm>90 |
0.15~1mm>90 |
0.15~1mm>90 |
|
CaO/SiO2 |
0.85~1.05 |
0.85~1.00 |
0.75~0.95 |
0.50~0.80 |
|
Hemisphere point |
1070~1130℃ |
1100~1150℃ |
1030~1080℃ |
1000~1120℃ |
|
1300℃melting speed |
30~40 S |
35~45 S |
40~50 S |
40~50 S |
|
Carbon content |
8~12 |
10~14 |
12~17 |
13~18 |
|
Applicable section |
120mm×120mm, 150mm×150mm, 175mm×175mm, 180mm×180mm, 200mm×200mm, 240mm×240mm, 300mm×300mm, 280mm×320mm ,320mm×410mm |
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|
Applicable casting speed |
0.6~4.0m/min |
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Note: Applicable steel grade: Carbon, excellent carbon and low alloy steel with a carbon content of 0.08~0.35%
APPLICATIONS
It mainly applied to Continuous casting mould
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