ZHENGSHAN TECHNOLOGY

Seamless calcium wire is an important metallurgical technology for calcium treatment of molten steel, mainly used to improve the quality and performance of the steel. The main principles and operating processes are as follows:
Processing principle
Calcium addition:
Seamless calcium wire is added to the molten steel through feeding equipment, and the calcium wire quickly melts and releases calcium elements at high temperatures.
Calcium element forms calcium vapor in molten steel, which can effectively react with impurities such as oxygen and sulfur in the steel.
Deoxygenation:
Calcium has strong deoxygenation ability and can form calcium oxide (CaO) with oxygen in molten steel, thereby reducing the oxygen content in the steel.
The deoxidized molten steel has better fluidity and higher quality of the casting billet.
Desulfurization effect:
Calcium can also form calcium sulfide (CaS) with sulfur in molten steel, thereby reducing the sulfur content in the steel.
The desulfurized steel has stronger crack resistance and higher quality of the cast billet.
Inclusion morphology control:
Calcium element can change the morphology of inclusions in molten steel, transforming them from brittle inclusions to plastic inclusions, thereby improving the castability of molten steel and the mechanical properties of castings.
Operation process
Selection and installation of wire feeding equipment:
Choose the appropriate feeding equipment to ensure that seamless calcium wire can be evenly and continuously added to the molten steel.
The wire feeding equipment should be installed in the appropriate position of the molten steel ladle to ensure that the calcium wire can smoothly enter the molten steel and fully react.
Control of feeding speed:
The feeding speed is one of the key factors affecting the effectiveness of calcium treatment. Excessive feeding speed can lead to incomplete dissolution of calcium wire in molten steel, resulting in waste; A slow feeding speed can cause the calcium wire to dissolve too slowly in the molten steel, affecting the treatment effect.
Normally, the feeding speed should be adjusted based on factors such as the temperature, weight, and diameter of the calcium wire of the molten steel.
Selection of feeding position:
The feeding position should be selected in a position where the steel flow is relatively sufficient to ensure that the calcium wire can be evenly distributed in the steel.
The feeding position should avoid being close to the edge or bottom of the ladle to prevent local aggregation of calcium wire in the molten steel.
Control of calcium treatment time:
The calcium treatment time should be adjusted based on factors such as the temperature, weight, and diameter of the calcium wire of the molten steel. Excessive processing time can lead to excessive consumption of calcium, while too short processing time can result in insufficient utilization of calcium.
Normally, the calcium treatment time should be controlled between 5-10 minutes.
Detection of calcium treatment effect:
After the calcium treatment is completed, the molten steel should be sampled and tested to evaluate the effectiveness of the calcium treatment.
The main testing items include the oxygen and sulfur content in molten steel, as well as changes in the morphology of inclusions.
summary
Seamless calcium wire is an effective metallurgical technology for calcium treatment of molten steel, which can significantly improve the quality and performance of the steel. By implementing reasonable operating procedures and parameter control, it is possible to ensure that calcium elements fully play a role in the molten steel, thereby improving the castability of the steel and the mechanical properties of the billet. In the future development, the application of seamless calcium wire will be more extensive, contributing to the development of the metallurgical industry.