What’s the matter with excessive carbon content in stainless steel castings?

What’s the matter with excessive carbon content in stainless steel castings?

Excessive carbon content will cause carbon steel castings to deteriorate and cause extravagance and waste. Many people do not understand it. Only by understanding the reasons can effective measures be taken to prevent it. Next, we will introduce in detail the reasons for the excessive carbon content of carbon steel castings.

1. The pouring standard setting of stainless steel castings is unscientific: if the pouring and filling steps are set too long, the pouring dissolution temperature will be low, the wall thickness of the casting will be expanded, especially the casting dissolution process is slow, resulting in a prolongation of the equivalent time of high-efficiency liquid phase consolidation of stainless steel castings. Promote the prolongation of the dissolution time of stainless steel castings, prolong the dissolution time, and increase the dissolution time.

2. The moisture content of stainless steel castings is not strictly controlled, and the carbon content of various scrap steels and the raw materials of whether there are other alloy components in the scrap steel are unclear.

3. The configuration of the stainless steel casting pouring system is unscientific: especially the software configuration of the vacuum packaging system is unscientific. The sand box or casting pouring process and shape are used, resulting in differences in the vacuum values ​​of the entire pouring and pouring boxes. The error is too large, or the specific vacuum value is insufficient. , the information displayed on the vacuum pressure gauge conforms to the wrong value of the performance parameter, making it difficult for the surface decomposition reaction substances to be quickly discharged into the die, resulting in nitriding or carbon deposition in the casting.