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Screw &barrel of an extruder machine, 1,Hardness After Hardending&Tempering : HB240~280, 2,Nitrided Hardness - details see: https://www.machineto.com/extruder-screw-10335045

1,Standards of single screw and cylinder of exturder machine:20mm--300mm,

2,Ratio of length to siameter :L/D=15--55

Technical Specification

1,Hardness After Hardending&Tempering : HB240~280

2,Nitrided Hardness : HV900~950

3,Nitrided Case Depth : 0.55~0.7mm

4,Nitrided Brittleness :Less Than Grade 1

5,Surface Roughness :Ra 0.4

6,Screw Straightness :0.015mm

7,Surface Chromium-Plating’s Hardness After Nitriding≥900HB

8,Chromium –plating Depth :0.05~0.10mm

9,Alloy Hardness : HRC55~62

10,Alloy Depth :1.5~2.0mm

Material&Processes

1,Quality 38CrMoALA

2,Qulity Duplex Stainless Steels

3,GH3#Steel

4,Quality Powder Metallurgy Raw Materials

5,Cold/Thermal Spray Hard Metal Process

6,Advanced nitriding Process

7,Corrosion & Abrasion Resistance Bimetal Spraying Process

8,Horniness screw (HTP1:abrasion HTP2:corrosion resistance,HTP3:abrasion and corrosion resistance)