What are the basic characteristics of gray iron? What are the precautions for processing?


Release time:

2023-12-22

For gray iron casting manufacturers, the characteristics of the product itself cannot be ignored. Below are the basic characteristics of gray iron.

For gray iron casting manufacturers, the characteristics of the product itself cannot be ignored. Below are the basic characteristics of gray iron.

The clay content of this product is relatively high, and its moisture content is also relatively low. During the sand mixing process, attention should be paid to the mud content and mud content. If the content of clay is higher than that of sand, the performance of pull-out strength will be improved.

Normally, we should control the effective bentonite content between 7% and 10%. The total amount of clay and available clay in the molding sand should be maintained at the same level as the mud content.

Secondly, people who want to buy gray iron castings should pay attention to the moisture content of the product, whether in production or in production. Moisture is one of the important factors determining the adhesion and plasticity of a product. If the moisture content is relatively high, it can also cause changes in the cohesive strength of the clay, leading to a decrease in the fluidity of the molding sand. Moreover, low moisture content can lead to product brittleness and some defects.

The processing technology of gray iron castings is relatively simple. The laser strengthening treatment and surface alloying technology of gray iron castings can form a metallurgical bonding alloy layer on the surface of ordinary castings, making the castings have composite properties. And significant results have been achieved. Strengthening and refining are the development directions of gray iron in China. Thin walled, lightweight, and tough gray iron is designed to meet the requirements of the engineering industry for energy conservation and reusable engineering materials, as well as people's demand for green environmental protection. All gray iron processed by special production processes have significant characteristics of graphite refinement, uniform structure, and high strength. Suitable for the needs of various buildings.

Foundry manufacturers use resin sand and lost foam casting in the casting of gray iron. Various casting defects often occur in the production process of gray iron. How to prevent these defects has always been a concern for foundry manufacturers. Let's explain below.

In the process of gray iron casting, appearance data gasification produces a large amount of gas, especially at the moment when the molten metal just contacts the foam plastic. Choose bottom pouring bags as much as possible. The heat loss of the molten metal in the bottom pouring ladle is small, the pressure head is large, the pouring speed is fast, the slag floats on the surface of the molten metal, and the poured steel is relatively clean. Due to equipment limitations, some small and medium-sized machine tool castings with low or general requirements can also be subcontracted. Control the content of gas generating substances in molding sand or core sand, and the moisture content of wet molding sand should not be too high. The amount of release agent and water used during molding and mold repair should not be too high. The sand core needs to be dried, and the dried sand core cannot be stored for too long. The sand core used on the second day should be returned to the furnace for drying before use to prevent moisture absorption. Cold iron and core supports that are damp and rusty should not be used.

We are a manufacturer of gray iron casting. If you want to learn more about this aspect, you can contact us. We can introduce to you from different aspects.

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