Does a sword that cuts iron like mud really exist?

This question is difficult to answer. If ordinary people have not seen it, if it is not recorded in historical materials, many people say that ancient technology is not as good as modern technology, but many cultural relics left behind are beyond the reach of modern people.

Some modern technologies can achieve the goal of nitpicking and cutting iron like mud, but they have not appeared in real life. Nowadays, most of the sword casting skills are mainly for viewing and collecting, and some craftsmen who inherit traditional skills also try their best to blow hair and cut hair.

But I haven't seen whether it can cut iron like mud, but it's okay to cut iron wire and copper coins.