All right ... now try blacksmithing.

The temperature required to make iron is between 1,250°C and 1,538°C (2,282°F – 2,800°F), with industrial blast furnaces often exceeding 1,500°C (2,730°F) to melt iron and remove impurities.
Steelmaking requires even higher temperatures -- around 2,200°F to 3,000°F, or 1,200°C to 1,650°C -- with industrial electric arc furnaces often reaching over 3,000°F. (Sorry. The protagonist in my last novel was a blacksmith in ancient times, so these figures are seared into my brain. No pun intended).
Now, the image of a shirtless or near-naked blacksmith is common in modern fantasy, art, and film ... but let's be honest: no-one wants extreme heat, sparks, and hot metal splinters anywhere near their skin. (Not to mention their, um ... "voonerables").