An explanation of the reasons for excessive carbon content in stainless steel castings

Is the carbon content of stainless steel castings too high?

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

1. The setting of pouring standards for stainless steel castings is unscientific: if the pouring and filling steps are set too long, the pouring dissolution temperature will be low and the wall thickness of the castings will expand. In particular, the casting dissolution process is slow, which prolongs the equivalent time of high-efficiency liquid phase consolidation of stainless steel castings. , extending the dissolution time of stainless steel castings, extending the interval, and increasing the interval.

2. The moisture content of stainless steel castings is not strictly controlled, and the carbon content of various scrap steels and whether the scrap steel contains raw materials with other alloy components 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 a difference in vacuum values ​​between the entire pouring and the pouring box. 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.