There are many types of cast steel (steel-making) recarburizers. Generally, large steel mills will choose a variety of recarburizers according to different steel grades. However, the general materials are calcined coal or graphite balls, and natural graphite is also used. The content ranges from 75%-99%.

China’s calcined coal recarburizers are mainly produced in Shizuishan, Ningxia, and Wuhai, Inner Mongolia. The composition is generally C: 90-93%, S0.3-0.5. Mainly used for steel-making enterprises. Some foundry companies use gray cast iron.

The disadvantages of calcined coal recarburizer used in steelmaking are its low carbon content, slow melting, easy waste of electric energy, and relatively large residual amount.

Source: https://baijiahao.baidu.com/s?id=1696725746680188934