Looks like China (really, don't spray, I don't know what to think). China's ironmaking technology existed in the Qin Dynasty, and it was constantly improved later. It was perfect in the Han and Tang dynasties, as can be seen from the strange knife and bright armor in the Han Dynasty. But if that person invented it, I think only God knows, because craftsmen didn't have jobs before, even if they invented it, what weapons would they have in a certain year. So I don't know who invented it first As for the age, I should be the pre-Qin dynasty first, because the Qin dynasty was only mass production and perfection, not creation. So it should be the pre-Qin period. As for Zhou or the Spring and Autumn Period of Warring States, different people have different opinions.

As for steelmaking, in fact, there were 8-65,438+0.5 million tons of steelmaking in the Northern Song Dynasty, while there were only 25,000 tons in the early days of the British industrial revolution, so the Han people before sending them were still very awesome. Unfortunately, they withered, the Ming navy rarely rose, and finally hid in the snow (Zheng He's voyage to the West at that time was 7,000 tons, but as for the Qing Dynasty, the Han people were.