Preparation of continuous casting molten steel1. The temperature requirements of continuous casting molten steel:The hazards of excessively high molten steel te

Preparation of continuous casting molten steel

1. The temperature requirements of continuous casting molten steel:

The hazards of excessively high molten steel temperature: ①The mold shell is thin and easy to break; ②The corrosion of refractory materials is accelerated, which easily leads to the loss of casting and reduces the safety of casting; ③Increases non-metallic inclusions, which affects the internal quality of the slab; ④Cast The columnar crystals of the billet are developed; ⑤ The central segregation is aggravated, and the centerline cracks are easy to occur.

The hazards of too low molten steel temperature: ①It is easy to cause nozzle blockage and casting interruption; ②The continuous casting surface is prone to defects such as blistering, slag inclusion, and cracking; ③Non-metallic inclusions are not easy to float up, which affects the inherent quality of the cast slab.

Second, the temperature control of molten steel in the ladle:

Strictly control the tapping temperature according to the smelting steel type to make it change within a narrow range; secondly, it is necessary to minimize the temperature drop from tapping, ladle, ladle transportation and the entire process of entering the tundish.

In actual production, measures need to be taken to adjust the temperature of molten steel in the ladle:

1) Ladle blowing argon temperature adjustment

2) Add scrap steel to adjust the temperature

3) The technology of heating molten steel in the ladle

4) Insulation of ladle