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Induction Heating of Billets, Bars, Rods, Wires, Slabs, Plates, Strips, Etc. [.pdf format]

Ensuring the quality of inductively heated billets

Authors: Gary Doyon, Doug Brown, Valery Rudnev, Chester Van Tyne
Publication: Forge magazine
Date: 4/1/2010

There are many parameters to be considered in designing an induction billet/bar heating system to meet the needs of modern forge shops. Application experience and computer modeling capability are important tools in developing effective induction heating system and avoiding unpleasant surprises related to common incorrect assumptions. Some of those incorrect assumptions that affect the quality of heated billets and bars are discussed in this article.

Superior induction heating technologies for modern forge shops. (in Japanese)

Author: Doug Brown, Valery Rudnev, James Lin, Tomoko Nakagawa
Publication: Proceedings of Japanese Forging Association conference (JFA)
Date: 7/1/2009

Today's forge shop must quickly adjust to a rapidly changing business environment while satisfying continuously increasing demand for greater quality of forged parts and environmental friendliness of process equipment. Steel billets (including plain carbon, microalloyied and alloy steels), by far, represent the majority of hot-formed billets, although other materials including titanium, aluminum, copper, brass, bronze, and nickel are also induction heated for hot forming. Recent developments, common misassumptions, and innovative solutions in induction billet heating prior to hot forming are discussed here.

Question and Answer regarding induction heating large billets

Author: Valery Rudnev
Publication: Heat Treating Progress, Professor Induction Series
Date: 1/1/2009

In the Professor Induction article "How do I select inductors for billet heating?" (Heat Treating Progress, May/June 2008, p 19-21), you stated "- When heating large-diameter steel or titanium billets (8 to 12 in., or 200 to 300 mm, and larger), it is often advantageous to use static heating with a vertical coil arrangement" - What is the main reason you say that static vertical heating is good for billets over 200 mm in diameter and why do you set the limit over 200 mm? Is this related to the running cost, initial system cost, or other reasons?

Innovative Induction Heating Technologies

Authors: Valery Rudnev, Doug Brown, Gary Doyon
Publication: Proceedings of Material Science & Technology, Conference & Exhibition (MS&T-08), Pittsburgh, Oct.5-9, 2008
Date: 10/5/2008

Presentation focuses on:

  1. Novel approaches to induction heat treating of critical automotive components, including but not limiting to induction contour hardening of spiral, hypoid and bevel gears with diameters from 6" to 8" (patent pending) and sprockets. Patented CrankPro Technology for non-rotational hardening and tempering of crankshafts (V-4, V-6 and V-8) and camshafts with non-convention journals and lobes.
  2. Specifics of induction hardening of hand tools (i.e., wrench jaws, hammers), fasteners, etc.
  3. Induction heating of large-diameter (8 to 12 in. and larger) billets made from carbon steels, stainless steels and Inconel, including a comparative assessment of progressive multi-stage horizontal induction heating approach vs. static heating using vertical inductors (frequency selection, electrical efficiency, system flexibility, cost, etc.).
  4. FluxManager® - technology for effective heating of carbon steel tubular goods (patented in 2007).
  5. Developing compact and highly-efficient induction tempering and stress relieving systems.

Intricacies for the successful induction heating of steels in modern forge shops.

Authors: Valery Rudnev, Doug Brown, Chester J. Van Tyne, Kester D. Clarke
Publication: Proceedings of 19th International Forging Congress, Chicago, IL
Date: 9/7/2008

Over the past three decades, induction heating has become an increasingly popular in forge shops. Among other subjects, this paper discusses:

  • Trends in forging steels. Selection of forging temperatures.
  • Intricacies of process requirements associated with recent knowledge related to theory and practice of induction heating.
  • Novel induction billet heater design concept.
  • Temperature uniformity requirements. Common misassumption.
  • "Stand-by" and "Rapid start" features of modern induction heaters.

Successful Induction Heating of RCS Billets

Authors: Valery Rudnev
Publication: Forge Magazine
Date: 7/1/2008

The induction heating of round bars and round-corner-square (RCS) billets are often treated as equivalent applications, even though they are not. This article reconciles recent theoretical and practical achievements in providing required heat uniformity when inductively heating rectangular and trapezoidal workpieces.

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