Why carbon has the biggest impact on steel properties
The alloy of carbon and iron is steel, the so-called alloy, two different elements, one iron and one carbon. With carbon, the properties of the original iron have changed. First, the melting point has changed, and it has decreased. Add a little alloy for better processing.Second, the properties of carbon also change after cooling, and some can become stronger, and the content becomes harder and harder, mechanically, it is brittle and there is not much shrinkage.0.35%以下的钢叫低碳钢，这是碳钢的界限，后来国家改成低合金钢，希望用同样的粗细，强度就加大了。If the carbon content is low, the fracture strength is small, the shrinkage rate is increased, and the strength is not considered enough. In the past, low-carbon steel was used, and the steel with a carbon content oflessthan0.35% was called low-carbon steel. This is the limit of carbon steel. Later, the country changed to low alloy For steel, the same thickness is expected to increase the strength.
A3 steel tensile test results in low strength, 20 silicon manganese strength is high, this is the performance of the alloy after adding carbon.Therefore, in metallography, there is a content called iron and carbon balance diagram, that is, various properties of different contents of iron and carbon, such as: quenching, why some steels can be quenched, and some steels cannot be quenched?That is directly related to the carbon content. Once the carbon content is high, it will cause fracture after welding.Sulfur and phosphorus are broken after welding, so it is unqualified.
To sum up: the content of carbon directly affects the performance of the material, so carbon has the greatest impact on the performance in steel.
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