The Precautions For Ferritic Stainless Steel Continuous Casting

Publish Time: 06/24 2021 Author: Site Editor Visit: 10332

Compared with austenitic stainless steel, ferritic stainless steel has a higher yield strength. Under the same working conditions, materials with smaller cross-sections can be used to save costs; in addition, ferritic stainless steel does not contain Ni (special ones contain only a small amount) ), the cost is relatively low. Therefore, the production and application of ferritic stainless steel has attracted people's attention.

The continuous casting process of ferritic stainless steel is relatively special. Unreasonable control is prone to problems such as surface cracks, bulging, internal cracks caused by bulging, center segregation, and low equiaxed crystal rate. Pay attention to the above points in production:

1. Big bag

Because there are more high-melting substances (Cr2O3, Al2O3, etc.) in the ferritic stainless steel molten steel, the viscosity of the molten steel is higher, which reduces the castability of the molten steel, and the nozzle is prone to nodules and freezes to death.

Therefore, it should have an independent ladle capping function to reduce the temperature drop of the molten steel during the casting process, and at the same time oxygen blowing is required to ensure the continuity of the casting.

2. Tundish

There are many high-melting substances in stainless steel, and the viscosity of molten steel is high. After molten steel is injected into the tundish, it is easy to form turbulence and slag entrapment.

In the design of the tundish, the tundish of the large-capacity deep molten pool should be adopted and the flow control device (slag retaining wall, slag dam, etc.) should be added to extend the residence time of the molten steel in the tundish and ensure that the inclusions in the molten steel are Mold powder absorption and assimilation. In addition, when changing the large package, the liquid level of the tundish steel cannot be lowered too much to prevent the vortex and slag.

3. Crystallizer

The mold from the ferritic stainless steel casting billet is easily affected by the hydrostatic pressure of the molten steel, and its width and thickness become larger or cause bulging defects. Therefore, the mold width adjustment device must use a servo-hydraulic remote adjustment that can flexibly adjust the opening and taper. The wide-adjustment cone crystallizer has on-line thermal adjustment and closed-loop self-locking to ensure that the taper is stable at ±0.2 mm, so as to adapt to the adjustment of taper and opening at different pouring temperatures.

4. Liquid level control flow

The liquid level of the mold adopts an electric cylinder to control the opening and closing mechanism of the tundish stopper rod to prevent uneven inflow of mold slag and avoid surface defects such as cracks and slag streaks.

5. Hydraulic vibration technology

Ferritic stainless steel has low high-temperature strength and high viscosity of molten steel. The low-amplitude, high-frequency vibration mode can solve the defects such as surface micro-cracks and deep vibration marks.

6. Second cold

Ferritic stainless steel is not sensitive to high-temperature thermal cracking, so the specific water content of ferritic stainless steel is higher than that of martensitic and austenitic stainless steels, that is, specific water content of ferrite> specific water volume of austenite> specific water volume of martensite .

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