(the) “Red Steel”; formerly Ferdinand; Hungarian: Nándorhegy; German: Ferdinandsberg) is a town in northeastern Caraș-Severin County, Romania, in the Bistra Valley.

In the spring months, especially May, floods are possible due to the melting of the snow in the high areas of the Țarcu Mountains and abundant rains.

A Roman castrum can be found near the cemetery of Zăvoi (ancient Agnaviae), a settlement close to Oțelu Roșu.

After the expulsion of Turks from Banat by the Habsburgs, the area was colonised by Germans and the place named Ferdinandsberg after emperor Ferdinand.

After 1947, the name Ferdinand did not please the Communist government, who changed it to Oțelu Roșu ("[The] Red Steel") in order to underline the importance of the town's metalworking industry.

Causes of this demographic regress are among others the problems of the metalworking industry and the high unemployment, making many young people leave the town and move into regional centres such as Timișoara and other areas of Romania.