Which civilization first invented metal smelting technology?

Hittites, right? Hittites were the first countries in West Asia and even the whole world to invent and use iron, and also the first people in the world to enter the Iron Age. Evidence from archaeological discoveries in recent years shows that the production of iron tools can be traced back to at least the 20th century. He is famous for smelting iron, and Hittite King regards iron as a patent, so that it is as expensive as gold, and the price is 60 times that of brass. Hittite's iron weapons once frightened Egypt and other countries. The Hittite's most effective weapon against the enemy is the chariot; On the battlefield, they drove armored horse-drawn chariots to the front, invincible, and made the enemy fearful.