Bimetallic Screw For Corrosion Resistance DW-S3

DW-S3 Bimetallic Screw for Plastic with Less 20% Corrosive and Reinforced Additives

 

DW-S3 uses cobalt-base alloys, which is good for processing engineering plastics with less than 20% corrosive and reinforced additives.

 

Cobalt element has various characteristics, including high temperature resistance, corrosion resistance, high strength, and ferromagnetism. Cobalt can maintain high strength at high temperatures and has low thermal and electrical conductivity. In addition, cobalt is a silver gray, glossy, hard and brittle metal with a melting point of about 1495 ℃, a boiling point of about 2870 ℃, and a relative density of 8.9g/cm ³ 34. Cobalt is relatively stable in air at room temperature, but begins to oxidize above 300 ℃. Cobalt has relatively stable chemical properties and usually does not react with water. It is also very stable in humid air. But under heating conditions, cobalt can react with elements such as chlorine, oxygen, and sulfur to produce corresponding cobalt salt products. Cobalt is a amphoteric metal that can be dissolved in dilute acids or passivated in concentrated nitric acid.

 

                                      

 

Technical Parameters

Product Name : Bimetallic Screw

Material : JYN1 + DW-S3 Series Alloy

Suitable Machine: Injection / Extrusion / Blowing ...

Available Size: Φ14-400mm, Length <8,000mm

Process Method: PTA Spray

Surface Hardness: 44-48 HRC

Surface Roughness: < Ra 0.8

Screw Straightness: < 0.02mm/m

Advantages

By spraying high quality alloy powder on screw flight with layer thickness 1.5-2.0mm, screws can get higher performance in both wearing & corrosion resistant performance.

Applications

General plastics & engineering plastics with below 20% corrosive and reinforced additives.

 

Comparison of DW-S Series Alloy

At this stage, we have DW-S1, DW-S2 and DW-S3 alloy types and treatments for wear fighting. 

Type	Alloy Components	Hardness (HRC)	Abrasion Resistance	Corrosion Resistance	Application
DW-S1	Ni. Cr, Si	52– 56	x	x	Recycling & engineering plastics with less than 30% reinforced additives.
DW-S2	Ni, Cr, W	54– 58	xx	x	Engineering plastics, reinforced additives less than 50%.
DW-S3	Co, Cr, W	44 – 48	x	xx	Reinforced additives and corrosive plastics less than 20%.

Suitability: (x good) to (xxx excellent)

 

     

 

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