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| Precautions for nitrogen content of casting carburizing agents |
| 2023-07-05 14:55:50 Number of visits：2211 |
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Precautions for nitrogen content of casting carburizing agents
Adding a certain amount of carburizing agent in steelmaking can effectively improve the quality of steel products. With the continuous improvement and promotion of casting technology and its application in practice, casting carburizing agents have gradually entered the research and development work of casting processes. However, due to the requirements of information technology, the nitrogen content in casting carburizing agents is more required. Special attention should be paid when purchasing casting carburizing agents!
The nitrogen content is an important indicator for measuring the quality of carburizing agents in castings. When a foundry buys a carburetor, on the one hand, it is the price of the carburetor, on the other hand, it is the content of fixed carbon, sulfur, ash, volatile matter and water in the carburetor. It pays little attention to the nitrogen content. The ordinary calcination of Petroleum coke carbonization furnace has a low calcination temperature and a high nitrogen and sulfur content. When gray iron castings are made, because the scrap itself will bring some nitrogen elements, if the proportion of scrap added is too large, ordinary high nitrogen calcination of Petroleum coke is used, The nitrogen content in the molten iron will greatly increase, and excessive dissolved nitrogen in the molten iron will hinder graphitization, improve the stability of carbides, promote the formation of d-type graphite, improve hardness, and reduce the processing performance of castings.
For gray cast iron, proper nitrogen can shorten the length of graphite sheet, increase the degree of bending capacity, passivate the end, and reduce the Aspect ratio, which can be more stable and the pearlite of the matrix, play a role in refining the grain structure, improving the tensile strength and hardness of the designed casting. It is mainly introduced that when the N in molten iron is more than 0.012%, the casting may have nitrogen porosity defects, and nitrogen holes are often found inside the casting One of the common defects in the daily life of casting enterprises is the circular, rectangular, and irregular development patterns of varying sizes on the surface or near the surface. After high-temperature desulfurization and denitrification treatment, the technical content of nitrogen and sulfur elements is very low. During the use process, the nitrogen content of the molten iron melted by the graphitized carburizing agent has a general requirement of very low!
From this, it can be seen that in the casting process, different nitrogen content casting carburizing agents should be selected according to the requirements, so as to correspond to the requirements and effectively ensure the quality of the casting product. Special attention should be paid to the nitrogen content of the casting carburizing agent!
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