Factors that cause excessive carbon content in stainless steel castings
Why is the carbon content of stainless steel castings too high?
Excessive carbon content will cause carbon steel castings to become defective products, leading to extravagant waste of resources. Many people do not grasp the reason. We can only take effective measures to prevent it if we grasp the cause of it. Let me introduce in detail the reasons for the high carbon content of carbon steel castings:
1. The pouring standard setting of stainless steel castings is not scientific: if the pouring filling step is set too long, the pouring desolubilization temperature is low during the whole pouring process, which is very slow for the expansion of the casting wall thickness. , Resulting in a longer waiting time for the high-efficiency liquid phase-solid, which promotes the improvement of the effectiveness of the desolventization and decomposing reaction materials, and increases the nitriding and carbon deposition of stainless steel castings.
2. The carbon and water content of the smelting seasonings in the manufacturing of stainless steel castings is not strictly controlled. It is very uncertain whether the carbon content in various scrap steels and whether there are other alloy components in raw materials in various scrap steels. clear.
3. The pouring system configuration of stainless steel castings is unscientific: it is very unscientific that the vacuum packaging system software and the pouring sand box or the casting process modeling design of the casting are not scientifically equipped, resulting in different vacuum values in the casting sand box during the entire casting process. , The error is too large, or the specific vacuum value is not enough, and the information displayed by the vacuum pressure gauge is also an incorrect value specified by the performance parameter, so that the decomposition reaction material cannot be quickly and conveniently discharged to cast the cavity, resulting in nitriding of the casting Or carbon deposits.