Sep 19, 2019 · Many people can weld steel, not many can weld aluminum. On the melt points of aluminum/steel. A reformatted post by Akimbo: Aluminum melts at 1,221°F or 660.3°C. Steel melts at around 2,500°F or 1,370°C (varies by alloy). Stainless Steel melts between 2,540 and 2,642°F or 1,394 and 1,450°C (varies by alloy).