A New Free-Machining Steel Containing Bismuth and Calcium

Abstract:

The paper presents a new environmentally friendly lead-free free-machining structural steel AVTs19KhGN containing bismuth and calcium. The following quality characteristics of the new steel (in as-cast and forged condition) are determined: mechanical properties; austenite grain size; amount of non-metallic inclusions; surface quality. In forged rods (square 20 mm) a tendency towards an increase of bismuth content is observed from bottom to top of the ingot. Calcium distribution along the billet is uniform. Surface quality of billets in heats following the test heats is comparable to that of analog steels. Austenite grain size does not exceed ASTM number 6. Austenite grain is refined with increasing bismuth content. Mechanical properties are at the same level as for the steel without bismuth and calcium.

• Periodical: Materials Science Forum (Volume 857)
• Pages: 251-255
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.857.251
• Online since: May 2016
• Authors: A.V. Ryabov, Aleksandr A. Dyakonov, Maksim Vakhitov
• Keywords: Alternative Lead-Free Steels, Bismuth, Calcium, Ecological Aspects of Steel Production, Free-Machining Steels, Machinability

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