This specification covers the requirements and corresponding test methods for two iron-nickel alloys and one iron-nickel-cobalt alloy, for low thermal expansion applications. The two iron-nickel alloys, which both contain nominally 36 % nickel and 64 % iron, are the conventional alloy designated as UNS No. K93603 and the free-machining alloy designated as UNS No. K93050. On the other hand, the iron-nickel-cobalt alloy contains nominally 32 % nickel, 5 % cobalt and 63 % iron, and is designated as UNS No. K93500. UNS No. K93603 and UNS No. K93500 shall be in the forms of wire, rod, bar, strip, sheet plate, and tubing, while UNS No. K93050 shall be for bar products only. When test, the alloys shall comply to specified requirements for chemical composition, surface finish, temper, grain size, hardness, tensile strength, thermal expansion, transformation, and dimensions.

1.1 This specification covers two iron-nickel alloys and one iron-nickel-cobalt alloy, for low thermal expansion applications. The two iron-nickel alloys, both containing nominally 36 % nickel and 64 % iron, with the conventional alloy designated by UNS No. K93603, and the free-machining alloy designated as UNS No. K93050. The iron-nickel-cobalt alloy, containing nominally 32 % nickel, 5 % cobalt and 63 % iron, is designated by UNS No. K93500. This specification defines the following product forms for UNS No. K93603 and UNS No. K93500: wire, rod, bar, strip, sheet plate, and tubing. The free-machining alloy, UNS No. K93050, is defined for bar products only. Unless otherwise indicated, all articles apply to all three alloys.

1.2 The values stated in inch-pound units are to be regarded as the standard. SI values, shown in parentheses, are for information only.

This pertains only to the test method section, Section 13. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.