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6 common types of refining devices outside the ladle furnace and the types of refractory materials used

The ladle degassing refining method is the main method of refining outside the furnace (also known as secondary steelmaking). Out-of-furnace refining is the process of transferring the molten steel smelted in a roughing furnace (electric furnace and converter) to another high-temperature vessel (mainly a ladle) for refining: Refining is a process of using different metallurgical treatment methods and devices outside the furnace according to the type of steel to be smelted.

Basic knowledge of continuous casting and 11 issues for improving the quality of continuous casting slab

 1. What are the causes of longitudinal cracks on the surface of continuous casting slabs and their prevention methods?

Longitudinal cracks on the surface of continuous casting slabs will affect the quality of rolled products. For example, a longitudinal crack with a length of 300mm and a depth of 2.5mm leaves a 1125mm layered defect on the rolled plate. Severe longitudinal cracks will cause leaks and rejects.

Safe operation process of continuous casting and pouring steel

01 Tundish preparation

1. Check the wall, bottom and baking conditions of the tundish;

2. The middle contractor shall determine the middle contract number used on duty according to the middle contract situation, write it on the blackboard and explain and sign on the "Tundish Packaging Safety Use Record Sheet" in the duty room (such as: normal, spare, new package and baking status, Out of service);

Reasons and preventive measures of steel breakout in continuous casting machine

 One of the main operational failures encountered in continuous casting is "breakout". When the cast stream slab shell ruptures, the static molten steel in the slab shell overflows and blocks the machine, requiring expensive downtime. In order to pull out the breakout shell, it is necessary to extend the downtime caused by the breakout, because it may block the guide roller or the foot roller, and air cutting is required to clean the blockage and pull out the billet shell. When the temperature of the broken steel billet shell decreases, it needs to be cut into small pieces and taken out of the machine with a straightening machine. The straightening machine is designed to gradually straighten the cold billet shell in the stable stage. The upper roll can provide enough Lift the gravity to create a curved cast stream that is not too long. Therefore, the breakout has a major impact on the effectiveness of the casting machine—influencing productivity and production costs.

Matching principle of continuous casting machine and steelmaking and rolling

Classification method of continuous casting machine

At present, continuous casting machines have been widely used in steel mills, with various forms and different uses. The name of the continuous casting machine is also very inconsistent. Now introduce the classification method of continuous casting machine according to general habits:

Slide gate plate and nozzle installation

Before installing the upper nozzle on the online ladle, first check the usage of the nozzle block. If there are pits or cracks, use the repair material to repair, and then perform the next step.

Take the upper nozzle brick for trial installation, check the gap between the nozzle brick and the seat brick and the positioning of the nozzle brick. It is forbidden to smash off the upper nozzle head before installing.

Take the upper nozzle brick for trial installation, check the gap between the nozzle brick and the seat brick and the positioning of the nozzle brick. It is forbidden to smash off the upper nozzle head before installing.

When installing the nozzle, the nozzle brick should be smoothly fed into the seat brick, and the mud at the bottom of the nozzle brick should be prevented from falling off and creating gaps during operation.

The water inlet must be replaced when the following conditions exist during installation and use.

The installation and positioning distance of the upper nozzle exceeds the standard range, resulting in the clamping of steel between the upper nozzle and the upper sliding plate or the phenomenon of inability to pull.

The horizontal or vertical aperture of the water inlet exceeds 85mm.

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Slide gate plate nozzle