The bond leakage of crystal is discussedFor copper mould tubes , steel leakage is a very serious problem, among which adhesive steel leakage is very prone to m

The bond leakage of crystal is discussed

For copper mould tubes , steel leakage is a very serious problem, among which adhesive steel leakage is very prone to major accidents, so we need to know the reason, at the same time how to solve, these are very big problems, so we need to study and discuss.

Crystalline bond leakage:

1, in terms of the formation mechanism of the bond, its internal cause is due to the meniscus poor lubrication of initial solidified shell and mould, make the shell caused by friction is more than its yield strength tear, caused by poor lubrication shell of various factors are the external causes, such as powder, crystal vibration, liquid level fluctuation, drawing speed, degree of superheat, etc.

2. In terms of bonding propagation mechanism, due to bonding propagation, the billet shell forms V-shaped tearing lines and wave marks at the bonding point, and the thickness of the billet shell gradually decreases from menile face downwards, which is different from the normal growth of the billet shell. Therefore, the bonding propagation behavior is studied by studying bonding propagation speed and tearing line Angle.

3, not quantitative combination of bonding of internal cause and external cause to analyze bond formation mechanism, so that for a lot of casting process factors and quantitative relationship between bond formation is not clear, so through the quantitative analysis to study the formation mechanism of bonding the fundamental cause of different bonding, to suit the remedy to the case to improve the casting process of binding induced factors have important practical significance.

It is worth noting that some achievements have been made on the repair mechanism of bonded steel leakage abroad, but there are also some shortcomings.  In China, there is a lack of research on this aspect, and in many slab caster in China, the actual control measures after bond alarm are adopted to reduce the drawing speed mode. Although most steel leakage can be avoided, sometimes there are still steel leakage or direct excessive shutdown after bond alarm and reduce the speed