Foseco Ferrous Foundryman's Handbook, Eleventh Edition by John Brown

By John Brown

The Foseco Ferrous Foundryman's guide is a pragmatic reference publication for all these all for making castings in any of the widely used alloys, by means of any of the standard moulding equipment. overseas SI devices are used all through, yet in just about all situations conversions to the extra standard Metric and Imperial devices are given. anyplace attainable, Casting Alloy requirements comprise similar requisites for numerous international locations in addition to foreign requirements. person chapters hide the casting of sunshine alloys, copper-based alloys, all kinds of forged iron and metal. for every staff of alloys,specifications and common purposes are defined, including info of melting perform, steel therapy and casting perform. Sand moulding fabrics, together with eco-friendly sand and chemically bonded sands also are incorporated.

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This is conveniently expressed in graphical form (Fig. 2). From Fig. 2 it is possible to construct a series of curves showing the reduction of strength with increasing section thickness, this is shown in Fig. 1 for the common grades of grey iron. It is important to realise that each of these curves represents an average figure and a band of uncertainty exists on either side. Nevertheless, these figures represent those likely to be achieved on test bars cast in green sand moulds. 2 Relationship between tensile strength and carbon equivalent value for various bar diameters.

Fig. 4). 1). 4 Nodular graphite, 4% picral ×100. ) The great hardness and abrasion resistance of white iron has also been exploited. The strength of white iron has been improved through alloying and heat treatment, and white iron castings are widely used in applications such as mineral processing, shot blasting etc. where the excellent wear resistance can be fully used. Finally there are a number of special cast irons designed to have properties of heat resistance, or acid resistance etc. In the following chapters, each type of iron will be considered separately and its method of production described.

4b). Applications of grey iron castings Grades of grey iron suitable for various types of casting Unalloyed grey iron is used for a wide variety of castings. The following table indicates typical grades of iron used for making certain types of casting. 3 is only intended as a guide, casting buyers may specify different grades from those in the table. Some buyers may have their own specifications which do not coincide exactly with international or national specifications. The production of grey irons In order to produce castings having the required properties, the following factors must be controlled: the charge to be melted; the method of melting; treatment of the liquid metal before casting.

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