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All things being equal, increasing the carbon content decreases the melting point. However, the melting point of carbon steel (steel that has a carbon content below about 2%) is dependent on its total alloy composition. Other compositional elements such as manganese, copper, chrome, silicon, etc. are always present to some degree in low carbon steel melted from recycled scrap material.

For a binary carbon - iron system, the liquidus temperature begins at approximately, 2802 degrees Fahrenheit at 0% carbon and decreases to 2097° F at 4.3%.

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Q: Why carbon content decreases the melting point?
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