Recarburizer is an indispensable additive in iron and steel smelting. Its use can save a lot of iron ore usage, and at the same time increase the usage of scrap steel and scrap iron, reduce production costs, and save non-renewable resources.
Carbon and sulfur are important elements that determine the quality of steel specifications. Iron products with a carbon content of more than 1.7% are called cast iron, iron products with a carbon content of less than 1.7% are called steel, and steels with a carbon content of more than 0.6% are called high-carbon steels. , Steel with carbon content between 0.25-0.6% is called medium carbon steel, steel with carbon content less than 0.25% is called low carbon steel, and steel with carbon content less than 0.04% is called industrial pure iron.
Carbon plays an important role in the performance of steel. As the carbon content increases, the hardness and strength of the steel will increase, but the plasticity and toughness will decrease. On the contrary, the carbon content decreases, and its hardness and strength also decrease. Toughness and plasticity will increase.
Sulfur will deteriorate the quality of steel and reduce the mechanical properties of steel into corrosion resistance and weldability. Especially the sulfur in the steel, if it exists in the state of iron sulfide, because of its low melting point, it will cause the hot brittleness of the steel, that is, thermal deformation, cracks will occur when working at high temperatures, which will affect the quality and service life of the product.
Therefore, the lower the sulfur content in the steel, the better.
The sulfur content in ordinary steel should be less than 0.05%, the sulfur content in tool steel should be less than 0.045%, and the sulfur content in high-quality steel should be less than 0.02%. In view of the important effect of carbon and sulfur content on the quality and performance of steel, the carbon and sulfur content in steel is tested, and the carbon and sulfur in steel are combusted with oxygen at high temperature.