| 摘要 |
A bimetal flange connector (10) for connecting components (15) of a piping system such as fittings or pipe in which the bimetal flange connector (10) has a hub or preformed inset (12) of a first metal material compatible with the piping system components (15) enabling welding, brazing or other method to be utilized in connecting the inset (12) to the piping system component. The bimetal flange connector (10) has a rim (14) of a second metal material castable directly onto said inset (12). The rim (14) is retained on the inset (12) by a shrink fit on cooling, a metallurgical bond, a preformed retainer configuration of the inset or a combination of the foregoing. For certain combinations, of low carbon inset material and high carbon rim material, the inset (12) is prepared for the cast-on rim (14) by the interposition of a boundary layer (45) of carbon migration inhibiting material to prevent carbon migration from the cast-on rim (14) from adversely affecting the properties of the inset (12). The bimetal flange connector (10) allows the inset (12) to be of one compositon with desirable characteristics for connecting to a piping system component (15) and the rim (14) to be of a second material with desirable characteristics for mechanical connection to a mating flange, one preferred embodiment employing a stainless steel inset (12), a ductile iron rim (14) and an interposed chromium boundary layer (45) at the interface juncture of rim and inset. |
