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.
Covering powder is mainly used to cover the molten steel surface of ladle and tundish in the process of continuous casting. The function is to avoid excessive temperature drop of molten steel during transportation and casting, and cold steel on molten steel surface.
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PRODUCT FUNCTION
Heat insulation to prevent steel surface crusting;
Isolating air and prevent secondary oxidation of molten steel;
Absorbing the non-metallic inclusions on the steel surface and purifying the molten steel.
TECHNICAL SPECIFICATIONS
|
Type |
FGJ-1 |
FGJ-2 |
FGJ-3 |
FGJ-4 |
|
Moisture % ≤ |
1 |
1 |
1 |
1 |
|
Particle size ≤ |
2mm |
2mm |
2mm |
2mm |
|
Carbon content% |
≤20 |
≥6 |
--- |
≤20 |
|
CaO/SiO2 |
0.3~1.0 |
≥0.9 |
≥0.9 |
1~5 |
|
Applicable steel grade |
Carbon steel, excellent carbon steel, low alloy steel, etc |
|||
|
Applicable section |
Steel ladle, Tundish |
|||
During steelmaking and continuous casting, exposed molten steel can lose heat and interact with the surrounding atmosphere. Applying an appropriate molten steel covering agent creates a protective layer over the steel surface.
Its main functions include:
For both steel ladle and tundish applications, stable coverage of the molten steel surface is an important part of thermal management and steel cleanliness control.
One of the primary functions of a steel ladle covering agent is thermal insulation.
Molten steel continuously loses heat during holding, transportation, refining and casting. Excessive temperature loss may reduce operating flexibility and increase the risk of surface crusting.
After addition, covering powder forms a protective layer on the molten steel surface, reducing direct heat transfer to the surrounding environment.
Good thermal insulation can help:
The appropriate covering agent should provide sufficient insulation without negatively affecting the metallurgical process.
Molten steel exposed directly to air can react with atmospheric oxygen. A ladle or tundish covering powder provides a physical barrier between molten steel and the atmosphere.
This protective layer helps reduce reoxidation during:
Reducing unnecessary steel-atmosphere contact is particularly important when controlling steel cleanliness and minimizing the formation of additional oxide inclusions.
Non-metallic inclusions in molten steel can float toward the steel surface during ladle and tundish operations.
A properly selected tundish covering agent can interact with these floating inclusions and help retain them within the covering slag layer rather than allowing them to return to the molten steel.
For applications where steel cleanliness is particularly important, covering agent selection should consider not only thermal insulation but also:
The required balance depends on the steel grade and actual metallurgical process.
GUOLIANG covering agents can be used for both steel ladle and tundish applications, but operating requirements may differ.
A ladle covering agent is applied to molten steel in the ladle to reduce heat loss and atmospheric exposure during transportation, holding or secondary metallurgy.
Important selection factors may include:
A tundish covering agent is applied to the steel surface during continuous casting.
In addition to thermal insulation and protection against reoxidation, the tundish covering layer can also contribute to the absorption of inclusions floating from the molten steel.
Important factors include:
Using the correct grade for the actual vessel and operating conditions is therefore important.
GUOLIANG FGJ series covering agents are available with different carbon-content specifications.
Carbon can influence the thermal characteristics and behavior of the covering layer. However, the required carbon level should be selected according to steel grade and metallurgical requirements.
For applications where carbon pickup needs to be carefully controlled, customers should provide:
GUOLIANG can then evaluate the appropriate covering agent grade for the application.
The CaO/SiO₂ ratio, often referred to as basicity, is an important specification for metallurgical covering materials.
GUOLIANG FGJ series products are available with different CaO/SiO₂ ranges, allowing different grades to be matched to specific steelmaking requirements.
Basicity can influence characteristics such as:
For this reason, covering agent selection should consider the complete chemical specification rather than comparing only one parameter.
When purchasing a covering agent for molten steel, several process conditions should be considered.
First determine whether the material will be used in a steel ladle or tundish.
Carbon steel, low-alloy steel and other steel grades can have different requirements for covering-agent chemistry.
Operating temperature affects the behavior, melting and insulating characteristics of the covering layer.
Longer molten-steel residence time can increase the importance of stable insulation and oxidation protection.
For steels with strict carbon specifications, the carbon content of the covering material should be evaluated carefully.
When replacing an existing product, tell us whether the main objective is to improve:
Providing this information allows a more suitable product grade to be selected.
A typical application procedure is:
Molten Steel Ready → Add Covering Agent → Spread Evenly → Form Protective Layer → Maintain Coverage During Holding/Casting
For consistent performance:
Actual addition rates should be determined according to vessel size, molten steel surface area, process duration and the selected product grade.
GUOLIANG covering agents can be used in steelmaking and continuous casting applications including:
Different FGJ series grades can be evaluated according to actual steelmaking conditions.
GUOLIANG supplies covering agents and metallurgical auxiliary materials for steelmaking and continuous casting plants. FGJ series covering powders are available with different carbon-content and CaO/SiO₂ specifications for steel ladle and tundish applications.
For new projects or replacement requirements, GUOLIANG can evaluate the steel grade, vessel type, temperature conditions and existing material specifications to recommend an appropriate covering agent.
A covering agent is a metallurgical auxiliary material spread over the surface of molten steel in a ladle or tundish. It forms a protective layer that helps reduce heat loss, prevent atmospheric reoxidation and support the removal of floating non-metallic inclusions.
In steelmaking applications, terms such as covering agent, covering powder, ladle covering compound and tundish covering powder may be used for materials designed to cover and protect the molten steel surface.
It is commonly used on molten steel surfaces in steel ladles and tundishes during steelmaking, secondary refining and continuous casting.
Covering agent is mainly used on molten steel in ladles and tundishes for insulation and oxidation protection. Mold powder is specifically used inside the continuous casting mold and additionally performs important lubrication and mold heat-transfer control functions.
Selection should consider steel grade, molten steel temperature, casting time, carbon requirements, required basicity and steel-cleanliness requirements.
Yes. GUOLIANG's FGJ series includes different carbon-content and CaO/SiO₂ specifications for various steel ladle and tundish applications.
Send us your steel grade, ladle or tundish capacity, molten steel temperature, process conditions and current covering powder specification. GUOLIANG can recommend a suitable FGJ covering agent grade and provide a quotation according to your steelmaking requirements.
If you are interested in any of our products or would like to make your customized order, please feel free to contact us. We are looking forward to establish successful business relations with you.
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