C50
    
    Chemical composition
	
		
			| 
				Item | 
			
				Content(%) | 
		
		
			| 
				C | 
			
				0.470 - 0.550 | 
		
		
			| 
				Si | 
			
				≤0.400 | 
		
		
			| 
				Mn | 
			
				0.600 - 0.900 | 
		
		
			| 
				S | 
			
				≤0.045 | 
		
		
			| 
				P | 
			
				≤0.045 | 
		
		
			| 
				Cr | 
			
				≤0.400 | 
		
		
			| 
				Ni | 
			
				≤0.400 | 
		
		
			| 
				Mo | 
			
				≤0.100 | 
		
	
 
Quality Standard
Type of hardness: Through hardening
Hardened on the surface: 60 HRC +/-2
Depth of the hardness: 6 - 7 mm