Causes of transverse cracks in the corners of continuous casting slabs and preventive measures1. Transverse crackThis is a small transverse crack located at th

Causes of transverse cracks in the corners of continuous casting slabs and preventive measures

1. Transverse crack

This is a small transverse crack located at the corner of the cast slab. Produced at the troughs of the vibration marks on the inner arc surface of the cast slab, which are usually hidden and invisible. Transverse cracks co-exist with vibration marks. To reduce transverse cracks, it is necessary to reduce the depth of small vibration marks. Increase the vibration frequency and reduce the depth of vibration marks. The use of high frequency and small amplitude crystallizer vibration mechanism can effectively reduce the depth of vibration marks, Thereby reducing the occurrence of transverse cracks.

2. Causes of transverse cracks

1) The taper of the copper mould tube is too large.

2) The surface of the copper mould tube is scratched.

3) Inaccurate arc alignment between crystallizer outlet and zero section.

3 .Measures to prevent Transverse cracks

1) The crystallizer adopts high frequency (200～400 times/min) and small amplitude (2～4mm) is an effective way to reduce the depth of vibration marks.

2) The secondary cooling zone adopts smooth and weak cooling, and the surface temperature of the cast slab during straightening is greater than 900°C.

3) The liquid level of the crystallizer is stable, and the mold powder with good lubricating performance and low viscosity is used.

4) Use flame to clean surface cracks