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High-Machineability Steels

High-Machineability Steels Collaborations between metallurgists and industrial engineers have led to the development and successful introduction of high-machineability steels that make it possible to significantly improve machining indices at machine factories. The highest level of machineability is seen in free-cutting steels alloyed with sulfur, lead, and bismuth. This article examines aspects of their composition and structure and explains the role of nonmetallic inclusions, the importance of their morphology, and the need to have them distributed uniformly in the metal. A metallurgical technology can be used to improve the machineability of ordinary structural steels through inoculation with calcium or microalloying with sulfur. In the latter case, while sulfur content is kept to the level stipulated by standards for structural steels (S ≤ 0.04%), the machineability of these steels is improved as a result of a change in the morphology of the sulfides. A diagram is presented to show the areas in which different variants of high-machineability steels are used most effectively. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Metallurgist Springer Journals

High-Machineability Steels

Metallurgist , Volume 49 (6) – Sep 28, 2005

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References (2)

Publisher
Springer Journals
Copyright
Copyright © 2005 by Springer Science+Business Media, Inc.
Subject
Materials Science; Metallic Materials; Materials Science, general; Characterization and Evaluation of Materials
ISSN
0026-0894
eISSN
1573-8892
DOI
10.1007/s11015-005-0084-0
Publisher site
See Article on Publisher Site

Abstract

Collaborations between metallurgists and industrial engineers have led to the development and successful introduction of high-machineability steels that make it possible to significantly improve machining indices at machine factories. The highest level of machineability is seen in free-cutting steels alloyed with sulfur, lead, and bismuth. This article examines aspects of their composition and structure and explains the role of nonmetallic inclusions, the importance of their morphology, and the need to have them distributed uniformly in the metal. A metallurgical technology can be used to improve the machineability of ordinary structural steels through inoculation with calcium or microalloying with sulfur. In the latter case, while sulfur content is kept to the level stipulated by standards for structural steels (S ≤ 0.04%), the machineability of these steels is improved as a result of a change in the morphology of the sulfides. A diagram is presented to show the areas in which different variants of high-machineability steels are used most effectively.

Journal

MetallurgistSpringer Journals

Published: Sep 28, 2005

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