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			Specifications: 
			  
			Screw diameter: 15-300 mm 
			  
			Maximum length: 8000mm 
			  
			Inner diameter of barrel: 15-300 mm 
			  
			Maximum length: 4000 mm 
			  
			  
			  
			Different alloy materials can be selected according to different raw materials 
			  
			  
			  
			Substrate material: 
			  
			1)38CrMoAlA(JIS SACM645) 
			  
			Alloy material: 
			  
			1) Nickel base alloy + tungsten carbide 
			  
			  
			  
			  
			  
			Treatment process: 
			  
			heat treatment 
			  
			Nitriding treatment 
			  
			Spraying bimetallic alloy 
			  
			Centrifugal casting of bimetallic alloy 
			  
			  
			  
			Technical parameters: 
			  
			Nitriding depth: 0.50mm-0.80mm 
			  
			Nitriding hardness: 58-62hrc 
			  
			Surface roughness: RA 0.4 
			  
			Screw straightness: 0.015mm 
			  
			Double alloy depth: 3mm