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Valuable information on "electrothermal heating"
"Use of induction systems for the production of extruded, high-alloyed steel tubes"
by Dipl.-Ing. Stefan Beer;
Source: "HEAT PROCESSING", issue 2/2011
"The production of extruded seamless high-alloy steel pipes demands tight heating tolerances.
This article examines a modern system which offers significant benefits in terms of flexibility and energy efficiency.
Demand for high-alloy seamless pipes has increased noticeably in recent years due to the need for enhanced service performance.
The percentage of special alloys ordered, accompanied at the same time by ever smaller batch sizes, is continuing to rise simultaneously, necessitating an improvement, as well as greater flexibility, in process control.
[...]"