Carbon additive for casting
2021-07-14
Graphite carbon additive and coal carbon additivehave a fundamental difference, first, the raw material is different, graphite carbon increaser is made using natural graphite screening processing, coal carbon additive is made of anthracite forging; Second, the characteristics are different, graphite carbon enhancer has low sulfur low nitrogen low phosphorus, high temperature resistance, good conductivity, these are advantages of coal carbon additive not have.
There are many kinds of raw materials for casting carbon additive, and the production process is also different, there are wood carbon, coal carbon, coke, graphite, etc. , among which there are many small categories under various categories. High-quality carbon additive generally refers to the graphite carbon additive, at high temperature conditions, the arrangement of carbon atoms is in the micro-form of graphite, so it is called graphite.
Graphite carbon additive mainly produced in Shandong, Henan and so on, manufacturers are fewer, the main material is graphite petcoke and graphite electrode. The general composition is carbon content>98-99.5%; Sulfur < 0.05-0.03%. Mainly used in ball-ink cast iron. Characterized by fast absorption, high carbon and low sulfur.
Why do businesses such as steel mills opt for low sulfur and low nitrogen when buying carbon additive? How they affect steel during steel casting, S and N.
First, sulfur is often a harmful element. The steel is hot and brittle, reduces its ductility and toughness, and causes cracks in forging and rolling. Sulfur is also detrimental to welding performance and reduces corrosion resistance. Therefore, sulfur content is usually required to be less than 0.055%, and high-quality steel requirements to be less than 0.040%. Adding 0.08-0.20% sulfur to steel can improve machinability, commonly referred to as easy-to-cut steel. Secondly, the high nitrogen content will reduce the permeability of the carbon particle pores, thus affecting the melting speed and absorption rate of the carbon additive in the steel water. If you want to know more carbon additive, petcoke and other information please pay attention to Henan Star Metallurgy, I will answer for you.
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