Acta Mechanica Slovaca 2019, 23(3):36-41 | DOI: 10.21496/ams.2019.023

Analysis of Metallic Materials used for Manufacturing of Extruders Screws

Anna Dziubińska1, Janusz Sikora2
1 Department of Computer Modelling and Metal Forming Technologies, Lublin University of Technology, Faculty of Mechanical Engineering, Nadbystrzycka 36 Str., 20-618 Lublin, Poland
2 Department of Polymer Processing, Lublin University of Technology, Faculty of Mechanical Engineering, Nadbystrzycka 36 Str., 20-618 Lublin, Poland

The article presents a review of metallic materials used for manufacturing of extruders screws. The analysis is carried out for the NEWEX project, which aims to develop and test an innovative extruder [1-2]. The collected knowledge about the materials used to date to produce screws of extrusion machines and methods of increasing their service life will allow to design a new extruder consisting of materials of the highest quality and durability. Currently the screws are usually manufactured from steels for nitriding, heat resisting steels, tool steels and stainless steels. The study provides an analysis of the chemical composition and mechanical properties of the most commonly used material types. Among those, the following types of steels for nitriding, in accordance with the standard PN-EN 10085:2003 can be distinguished: 34CrAlNi7-10, 34CrAlMo5-10, 31CrMoV9. The type of heat resisting steel used for screws of extrusion machines is 14CrMoV6-9 according to the standard PN-H-84024:1975 (withdrawn without replacement). The most commonly used tool steels are X37CrMoV5-1 and X153CrMoV12 according to the standard PN-EN ISO 4957:2018-09. Among the stainless steels of the standard PN-EN 10088-1:2014-12 the steels X90CrMoV18 and X39CrMo17-1 are used in the production of screws. The study also presents methods of increasing the durability and strength of the screws of extrusion machines, including surface treatment processes. These processes include: hardening, surfacing and coating, as well as thermochemical treatment in the form of: carburising, nitriding and sintering.

Keywords: metallic materials for screws of extruders, steels for nitriding, heat resisting steels, tool steels, stainless steels, surface treatment

Published: September 27, 2019  Show citation

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Dziubińska, A., & Sikora, J. (2019). Analysis of Metallic Materials used for Manufacturing of Extruders Screws. Acta Mechanica Slovaca, 23(3), 36-41. doi: 10.21496/ams.2019.023
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    References

    1. Sikora J.W. (2017). Newex project - research issues and other activities. International Scientific Conference "Pro-Tech-Ma 2017 - Surface Engineering 2017", 20-23 June 2017, Bardejov, Slovakia, pp. 86.
    2. Dulebovį „. (2016). H2020 - NEWEX project na Strojnickej fakulte. Halo TU, no. 4, pp. 31.
    3. Stasiek J. (2008). Materials used for manufacturing of cylinders and extruder screws. Polymer Processing, vol. 14, no. 2, pp. 36-38.
    4. PN-EN 10085:2003 standard. Steels for nitriding. Polish Committee for Standardization. Warsaw.
    5. PN-H-84024:1975 standard. Steel for operation at elevated temperatures. Polish Committee for Standardization. Warsaw.
    6. PN-EN ISO 4957:2018-09 standard. Tool steels. Polish Committee for Standardization. Warsaw.
    7. PN-EN 10088-1:2014-12 standard. Stainless steels. Polish Committee for Standardization. Warsaw.
    8. TRANS-WEST. http://www.transwest.pl/pl,67,slimaki--cylindry--uklady-plastyfikujace.htmlTable 2: Mechanical properties of steel 34CrAlMo5-10 in quenched and tempered condition.Table 3: Conditions for heat treatment of steel 34CrAlMo5-10.Table 4: Chemical composition of steel 14CrMoV6-9 (% by weight).Table 5: Mechanical properties of steel 14CrMoV6-9.Table 6: Conditions for heat treatment of steel 14CrMoV6-9.Table 7: Chemical composition of steel X37CrMoV5-1 (% by weight).Table 1: Chemical composition of steel 34CrAlMo5-10 (% by weight).Table 8: Conditions for heat treatment and properties of steel X37CrMoV5-1.Table 10: Mechanical properties of steel X39CrMo17-1.Table 11: Conditions for heat treatment of steel X39CrMo17-1.Table 12: Chemical composition of steel X90CrMoV18 (% by weight).Table 13: Conditions for heat treatment and properties of steel X90CrMoV18.Table 9: Chemical composition of steel 14CrMoV6-9 (% by weight).

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