Company Filing History:
Years Active: 1978-1979
Title: Gerhard Kiefer: Innovator in Steel Wire Technology
Introduction
Gerhard Kiefer is a notable inventor based in Salzgitter-Lebenstedt, Germany. He has made significant contributions to the field of steel wire technology, holding two patents that showcase his innovative approach to improving the properties of steel wire.
Latest Patents
Kiefer's latest patents focus on methods of making steel wire adapted for cold drawing. One patent describes a process where a steel wire, after coming from the mill, is brought to a temperature between 850°C and 910°C. This is followed by multi-stage water-cooling, ensuring that the surface of the wire cools below the martensite start temperature while retaining austenite in the core. The retained heat in the core partially tempers the martensite formed at the surface. The wire is coiled at a constant temperature, allowing the retained austenite to undergo an isothermal transformation to fine pearlite. After coiling, the wire is air-cooled to room temperature, resulting in a structure with an outer layer of tempered martensite and a core of fine pearlite, which imparts excellent cold-working characteristics.
Another patent details a similar process where the steel wire is rolled while in the austenitic range and then cooled to a temperature between 850°C and 910°C. The cooling process is designed to bring the surface temperature below the martensite start temperature in approximately 0.2 seconds. This method also results in a wire structure that combines fully tempered martensite and fine pearlite, enhancing the wire's strength and cold-working capabilities.
Career Highlights
Gerhard Kiefer works at Stahlwerke Peine-Salzgitter AG, a company known for its advancements in steel production. His work has significantly impacted the manufacturing processes of steel wire, making them more efficient and effective.
Collaborations
Kiefer has collaborated with notable colleagues such as Hans Paulitsch and Alfred Babilon, contributing to the development of innovative steel wire technologies.
Conclusion
Gerhard Kiefer's contributions to steel wire technology through his patents demonstrate his commitment to innovation in the field. His work continues to influence the industry, providing advancements that enhance the properties and applications of steel wire.