The particle size of carburizing agent is the main factor affecting its melting into molten iron. The carburizing effect experiment was conducted using A, B, and C carburizing agents with roughly the same composition but different particle sizes in Table 1, and the results are shown in Figure 1. Although the carbon increase rate is the same after 15 minutes, the carbon increase time to reach 90% carbon increase rate is significantly different. It takes 13 minutes to use C carburizing agent without particle size treatment, 8 minutes to remove A carburizing agent with micro powder, and only 6 minutes to remove B carburizing agent with micro powder and coarse particles. This indicates that the particle size of the carburizing agent has a significant impact on the carburizing time, and mixing micro powder and coarse particles is not good, especially when the micro powder content is high.

2. The Effect of Carburizing Agent Particle Size on Carburizing Agent
Two people from Japan, Nakagawa and Wangyue, have conducted experiments on increasing carbon content with a mass fraction of 99.8% C and 0.023% S, and the particle size distribution is shown in Table 2. The experimental results are shown in Figure 2. From the figure, it can be seen that the carburizing effect of carburizing agent E with a particle size biased towards micro powder is extremely poor, while the carburizing effect of carburizing agent G with a particle size biased towards coarse powder is better; The carburetor A with appropriate removal of micro powder and coarse particles has a better decarburization effect.