How to deoxidize stainless steel casting

How to deoxidize stainless steel casting

Stainless steel casting generally requires deoxidation twice. In order to ensure the quality of stainless steel casting, the deoxidizer and deoxidation process should be reasonable.

1. To deoxidize stainless steel in the casting stage, first use manganese (99.7% electrolytic manganese flake standard) and ferrosilicon for one-time deoxidation. One-time deoxidation can remove most of the oxygen in the molten steel, for example, it can reach 70-90%. However, you One should never assume that everything is reliable as "silent" and "stubborn" people tend to lead to defective casting rates.

2. For those stubborn oxygen, the primary deoxidation process is powerless. The temperature and deoxidation ability determine that the primary deoxidizer’s task has been completed, so who will complete the fatal blow to the residual oxygen? The answer is: the deoxidation process! The deoxidizer is usually A so-called composite deoxidizer contains 2 or more components. A large amount of practice has shown that when composite deoxidizers containing multiple elements enter the steel solution, they not only perform their duties in the steel solution, but also condense with each other. Compared with operating alone, they can significantly improve their own deoxidation efficiency. Therefore, when designing composite deoxidizer products, this idea of ​​1 plus 1=is a very important design element. Of course, composite deoxidizers have other important indicators.

3. Deactivator price problem. The initial price of deoxidized electrolytic manganese fluctuated, and the price of ferrosilicon increased sharply this year. At present, ferroalloys are growing rapidly, and many brothers in the surrounding industrial areas have stopped working.

4. It is worth noting that the deoxidation process and deoxidizer of stainless steel casting are completely different from the deoxidation process used in steel plants. Please do not wear them. In particular, some foremen with a background in steel plants have this kind of inertial thinking. Steel plants generally Using slag diffusion deoxidation, the foundry does not need to directly precipitate and deoxidize the slag.