Turbocharger, having a steel material for high-temperature applications

A steel material with a tailored alloy composition addresses the challenge of maintaining high-temperature strength and corrosion resistance in exhaust gas turbocharger components, achieving cost-effectiveness and improved operational safety.

EP3861145B1Active Publication Date: 2025-03-19SCHAEFFLER TECHNOLOGIES AG & CO KG
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Patent Information

Application Number
EP2019782583
Authority / Receiving Office
EP · EP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2018-10-05
Filing Date
2019-10-01
Publication Date
2025-03-19
Estimated Expiration
2039-10-01

AI Technical Summary

Technical Problem

Existing materials for exhaust gas turbochargers face challenges in maintaining strength and durability at high temperatures up to 1000 °C, while also being cost-effective due to high nickel content requirements.

Method used

A steel material with a specific alloy composition is used for exhaust gas turbocharger components, including a composition of 0.4-0.5% Carbon, 1.25-1.75% Silicon, 3.0-12.0% Manganese, 19.5-20.5% Chromium, 5.0-6.0% Nickel, 1.00-1.5% Niobium, and optional additional elements, which provides high-temperature strength and corrosion resistance at reduced material costs.

Benefits of technology

The steel material achieves high warm strength and corrosion resistance, particularly in aggressive hot exhaust gases, while reducing material costs compared to conventional highly alloyed nickel alloys, thereby enhancing the operational safety and lifespan of exhaust gas turbochargers.

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Abstract

The invention relates to a turbocharger (1), comprising a turbine housing (21), which has an accommodating region for a turbine rotor disk (12) of the turbocharger (1), which accommodating region is arranged centrally with respect to a turbine housing axis (2a), and at least one turbine spiral channel (22), which tapers helically toward the accommodating region for the turbine rotor disk (12), wherein a wastegate valve, having a spindle arm and a valve plate arranged on the spindle arm, or a variable exhaust-gas guiding device, having bearing disks and guide vanes, is arranged in the turbine housing, characterized in that at least one of the following components: turbine housing, spindle arm and valve plate, or bearing disks and guide vanes, has a steel material (21a) for high-temperature applications, the material composition of which comprises, in addition to iron, Fe, at least the following alloying constituents in amounts within the specified limits in weight percent: carbon, C: 0.4-0.5%; silicon, Si: 1.25-1.75%; manganese, Mn: 3.0-12.0%; chromium, Cr: 19.5-20.5%; nickel, Ni: 5.0-6.0%; niobium, Nb: 1.00-1.5%. Said material composition ensures sufficient temperature resistance of the components, while having a lower nickel content and being less expensive in comparison with other high-temperature materials.
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