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Tube and tube‐support materials should be chosen to minimize fretting‐wear damage. Similar materials such as Inconel¹ ‐600 (I600) tubes and I600 supports must be avoided. Incoloy‐800 (I800), Inconel‐690 (I690) and I600 tubes with 410, 304L, 316L, 321 stainless steel or carbon steel supports are considered acceptable material combinations. A fretting‐wear coefficient, KFW, of 20 x 10^‐15 m²/N may be used as a first approximation for these tube and support material combinations (Guérout and Fisher, 1999). Other material combinations may be used. However, it would be desirable to obtain reliable fretting‐wear coefficients before choosing the material combination. Fretting‐wear coefficients are discussed in detail in Chapter 13.

The tube supports, whether they be flat bars, lattice bars, broached holes, scalloped bars or circular holes must be deburred to make sure there are no sharp edges between tube and support.