NANJING LESUN SCREW CO.,LTD

What Are the Commonly Used Extruder Screw Materials?

Currently commonly used extruder screw materials are: 45 steel, 40Cr, ammoniated steel, 38CrMOAl and so on.


1. The extruder screw material 45# steel is cheap with good processing performance


It has poor wear resistance and corrosion resistance.


Heat treatment: quenching and tempering HB220-270, high-frequency quenching HRC45-48.


2. The performance of the extruder screw material 40Cr is better than that of No. 45 steel


The extruder screw material 40Cr is often plated with a layer of chromium to improve its corrosion resistance and wear resistance. However, the requirements for the chromium plating layer are relatively high. If the plating layer is too thin, it is easy to wear, and if it is too thick, it is easy to peel off. After peeling, it will accelerate the corrosion. At present, it is rarely used.


Heat treatment: tempered HB220-270, hard chromium plating HRC>55.


3. Nitrided steel and 38CrMoAl, the material of the extruder screw, have excellent comprehensive performance


Generally, the nitride layer reaches 0.4-0.6 mm. However, the extruder screw material has low resistance to hydrogen chloride corrosion, and the price is relatively high.


Heat treatment: tempering HB220-270, nitriding HRC>65.


In foreign countries, there is a method of titanium carbide coating to improve the corrosion resistance of the extruder screw surface. But according to reports, its wear resistance is not good enough.


In recent years, the industry has taken a series of measures to improve the wear resistance and corrosion resistance of the extruder screw. One way is to use highly wear-resistant and corrosion-resistant alloy steel, such as 34CrAlNi, 31CrMo12, etc. There is also a method of spraying copper and aluminum alloy on the surface of the extruder screw. This copper-aluminum alloy has high wear resistance and corrosion resistance.

  • How to Protect the Screw and Barrel?

    How to Protect the Screw and Barrel?

    June 8, 2021What are the ways to protect the screw and barrel? Let's take a look together!Corrosive, abrasive and high-temperature resistant resins may unknowingly damage the screw and barrel. For example, so...view
  • Design Principle and Manufacturing Status of Extruder Screw

    Design Principle and Manufacturing Status of Extruder Screw

    November 24, 20211. Design principle of extruder screwThe main part of the extruder screw is an ordinary screw, which can be set in the melting section of the extruder screw or the groove of the metering section, or o...view
  • The Methods of Using the Extruder Screw Elements

    The Methods of Using the Extruder Screw Elements

    August 25, 2021The daily maintenance of the screw barrel is a problem that many people in the industry are concerned about, so what are the specifics?1.The predetermined temperature of the screw elementDo not start ...view
  • Disassembly Sequence of Extruder Screw and Barrel

    Disassembly Sequence of Extruder Screw and Barrel

    April 27, 2022When disassembling the extruder screw, special tools should be used and heavy hammer is not allowed. The specific disassembly steps are as follows:1. Disassemble the nozzle of the extruder screw and t...view
top Inquiry