Heat Treating Hints^sm
© 1995-2009
The Herring Group, Inc.

Heat Treating Hints^sm is one of our ways of sharing knowledge with the Industry we love. This is a changing series of technical articles which will be updated every month, and is designed to inform and educate. We cover a wide range of subjects extracted from our vast library of technical knowledge.

“The Heat Treat Doctor” presents…

Toughness Revisited

This article continues a discussion on Toughness focusing on the influence of alloying elements, microstructure, heat treatment, embrittlement phenomena and service conditions. The contributions of individual elements that have a favorable influence on mechanical properties are reviewed in some detail.
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Carbonitriding of Fasteners

Carbonitriding is an excellent choice for low-carbon fastener materials that required a uniform, but shallow case depth with good wear properties. This article covers a broad cross section of steels including 10xx, 11xx, 12xx, 13xx, 15xx, 40xx, 41xx, 46xx, 51xx, 61xx, 86xx, and 87xx series. Also discussed are nitrogen additions to the case and temper resistance manifesting itself in improved wear resistance.
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Oil Quenching in Vacuum Furnaces

Oil quenching has been used to achieve consistent and repeatable mechanical and metallurgical properties in a wide range of component shapes and sizes. This article considers factors such as economics/cost, performance, management of distortion, variability and environmental issues.
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Flowmeter Basics

This article asks and then answers a number of questions about flow measuring devices such as: what is a flowmeter?, what types of flowmeters are in use in the heat treatment industry?, what are the features and advantages of the most common flowmeter types?, is it easier to control a gas or a liquid?, what is the accuracy range of a gas flowmeter?, show flowmeters be recalibrated?, what affects gas measurement?, should maintenance be performed on flowmeters?, and how can you be in control, stay in control, operate safely and keep the cost as low as possible.
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Generic and practical information is presented on this Website and in these downloadable files.  It is not intended to replace or supplement federal, state, and local codes, government standards, insurance requirements, company policies and procedures, or common sense. In addition, all equipment manufacturers’ instructions and operating and maintenance manuals should always be thoroughly read and followed. Further, personnel training should be provided unequivocally to everyone who will be associated with operating such equipment. It is the responsibility of the individual downloading this information to pass along these and other warnings as appropriate prior to the use of the material. The Limit of Liability Statement found elsewhere on this Website applies to this information.

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