Ledeburite cast iron with a high carbide content and an evenly distributed graphite embodiment

US8317942B2 · kind B2 · utility

Assignee

• Federal-Mogul Friedberg GmbH · DE

Inventors

• Laszlo Pelsoeczy · Kürten, DE
• Wilfried Langner · Friedberg, DE
• Hans-Henning Zutz · Wermelskirchen, DE
• Thomas Gerle · Augsburg, DE
• Franz-J. Goebbeis · Burscheid, DE

Key dates

• Filing date: Feb 8, 2006
• Grant date: Nov 27, 2012
• Expiry date: Nov 9, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D2211/009
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A cast iron material, particularly a ledeburitic cast iron material with a carbide content of at least 15 wt. % and a characteristic free, evenly distributed graphite formation is disclosed. In this case, the evenly distributed graphite formation may comprise graphite flakes and/or vermicular graphite and/or nodular graphite. Depending on the respective application (diameter (D) of the running gear seal, peripheral speed), the basic matrix may be realized in pearlitic and/or bainitic and/or martensitic form. Due to the high graphite content, the material has a thermal conductivity that is three to four times greater than that of white cast iron materials, wherein this provides the advantage that no scoring of the running gear seals occurs at high peripheral speeds (>5 m/s) and large diametrical dimensions of the seals (D >600 mm). In addition, the high carbide content of at least 15 wt. % provides an adequate wear resistance, and other alloying elements such as chromium, vanadium, molybdenum and nickel provide the material with a corresponding corrosion resistance. The aforementioned ledeburitic cast iron material with evenly distributed graphite formation can be used, for example,…