Incoloy 907 / 909ㅣUNS N19907 / N19909

1. Introduce – A precipitation-hardened, low-expansion alloy of the Fe-Ni-Co-Nb system containing a high proportion of Co – Invar (Fe-36%Ni) loses its low-expansion properties at temperatures above approximately 200°C; however, the addition of Co raises the Curie temperature, allowing it to maintain a low coefficient of thermal expansion up to higher temperatures – While the absence of Cr results in a low coefficient of thermal expansion, the alloy is susceptible to high-temperature oxidation – Incoloy 909 is an alloy derived from 907 with the addition of Si (907: 0.15%...