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Description of BS 4276:1968 19681.1 This British Standard specifies requirements for Hard Metal grades generally used in the manufacture of dies for cold drawing wire, bar and tube in ferrous and non-ferrous metals and alloys. 1.2 Special Hard Metal grades in which some or all of the cobalt is present as eta-phase or in which binder metals other than Cobalt are used, are excluded from this specification. Eight types. Hardness, composition and grain size.
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