Hardening characteristics of carbon tool steel

• Publisher: Elsevier Science
• Year: 1935
• Tongue: English
• Weight: 103 KB
• Volume: 219
• Category: Article
• ISSN: 0016-0032
• DOI: 10.1016/s0016-0032(35)91605-2

✦ Synopsis

In co6peration with the United States Naval Gun Factory, a study is under way at the Bureau of the various foundry sands which are used in molding practice in the former institution. To date, the physical properties of fourteen types of foundry sands have been studied, and the limits for variation in grain fineness number, grain content class, grain distribution, grain shape, permeability, compressive and tensile strengths, surface hardness, and sintering point have been established. On the basis of these data, purchase specifications have been formulated. Each type of foundry sand requested by bid is required to be equivalent to a reference sample maintained at the National Bureau of Standards upon which physical properties have been determined. Each specification indicates methods for sampling sands and suitable methods of testing are also briefly described. With the uniformity of supplies of sands obtained by these specifications, a standardization of molding practice and general improvement in the castings obtained should be expected.

HARDENING CHARACTERISTICS OF CARBON TOOL STEEL.