Which aircraft was constructed of a nickel-steel alloy called Inconel X?

The XB-70 Valkyrie is the aircraft that was constructed using a nickel-steel alloy known as Inconel X. This material was chosen for its ability to withstand extreme temperatures generated by supersonic flight, making it particularly well-suited for the XB-70, a strategic bomber designed to cruise at high altitudes and speeds. The use of Inconel X in the construction helped provide the necessary structural integrity and performance benefits for such advanced aerospace applications.

While other aircraft mentioned also have their own unique materials and design features, the choice of Inconel X specifically aligns with the requirements for high-speed and high-temperature conditions that the XB-70 was expected to encounter. This specific engineering decision reflects the innovative approaches taken during the development of the XB-70, aimed at pushing the limits of aviation technology during its era.