Tisco 0.5mm 316 gold mirror stainless steel sheet 4x8 standard size blank transverse crack defect

The transverse crack defect of Tisco 0.5mm 316 gold mirror stainless steel sheet 4x8 standard size billet is the result of a combination of factors, but the main reason is that the arc in the second cooling section of continuous casting is poor, the secondary cooling is uneven, and the high temperature strength of the steel itself is low. , the brittle transition temperature is high. To this end, the corresponding process control measures are:

1. Strictly control the composition of steel grades, especially the control of the mass fraction of carbon and nitrogen. On the premise of not excessively increasing the production cost, wC+wN is required to be less than 0.03%.

2. Appropriately speed up the continuous casting speed, and achieve forced cooling by improving the quality of the nozzle, the spray angle, and increasing the amount of cooling water within a certain range, increasing the flow rate of the water, and reducing the water temperature to avoid the generation of brittle phases.

3. Improve the arc alignment accuracy of the casting machine, avoid excessive stress on the solid-liquid interface in the initial stage of solidification, and prevent the occurrence of intergranular cracks.

4. The casting billet is ground with temperature, and the grinding temperature is controlled to above 120℃, and the sequence and rolling of the billet are completed within one week.