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An Introduction to ASTM B898, The Reactive and Refractory Metal Clad Specification

From ATI Wah Chang

In 1999 the ASTM B10 committee Task Force on Clad Metal completed development and approvals of a specification covering Reactive and Refractory Metal Clad Plate. The task force effort included participation by representatives from equipment fabricators, chemical companies, metal manufacturers, explosion clad producers and roll-bond clad producers. Participation was global. B898 applies to clad of any-type manufacture, consisting of reactive or refractory metals and their alloys clad onto steel or any other structural metal. The presentation describes the basic details covered by the specification to assure that product technical requirements are properly addressed without unnecessarily burdening manufacturing costs. It will also review product quality and testing options available within the specification.

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Master Alloys and Alloying Additives
Master alloys and alloying additives are alloy element concentrates, grain refiners, hardeners, deoxidants and other agents added into a melt or metal powder blend to produce a particular alloy, modify a melt or alter processing characteristics.
Tungsten and Tungsten Alloys
Tungsten and tungsten alloys are refractory metals or alloys with a very high melting point and high density.
Molybdenum and Molybdenum Alloys
Molybdenum and molybdenum alloys are refractory metal and alloys with a very high melting point (non-alloy 2623 °C) and a low thermal expansion coefficient. They are used to fabricate evaporation crucibles, electrodes, rocket technology, furnace components, glass and zinc processing tools, and electrical contacts.
Bimetals and Clad Alloys
Bimetals and clad alloys consist of two or more different alloy layers that are integrally bonded together; usually into a metal plate, strip, sheet, or other stock shape.
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