First, the material 
IN: 4CR9SI2MO 
EX :21-4N 


Second, the process 
1, the rough precision forging; 
2, high temperature 800 ℃ ~ 1200 ℃ high temperature treatment. 
3, the inlet end of the high-frequency hardening, the end improved hardness, the hardness HRC of the trailing end 48 ° ~ 55 °, lower end of the fracture because of shortened service life. 
4, the surface nitriding treatment, processing layer deep 0.008mm, coloring nitride into gray, rust and increase the surface hardness 

Third, the packaging: Neutral packaging, simple packaging.