Do you have pictures of it before polishing?
How is it dated to Han? (i.e 2nd century AD or earlier) It seems to have no tang.
Where was it recovered to explain survival with so much steel intact?
How was it polished/how much oxidised metal was actually removed?
I first wonder what it looked like originally, what sort of burial conditions it was in (unless it was never buried) and also how much metal was removed to get it to the intact steel.
It has been said that in museum collections that there are Viking swords that could be polished up and used to effect according to one curator from Europe on Sword Forum. We only see the rotted hilts and corroded blades, so there should be some Chinese examples surviving too.
I would just like to know more about the origin and treatment of the piece.
BTW, Yes. Chinese metallurgy was comparitively advanced at this time. Absolutely no doubt. If we can balance this out instead I would point out that iron working first had to come from the West via Xinjiang & steppes peoples and both the Chinese bronze and iron ages are late on a world scale (bronze weapons used up to the mid 2nd century BC is very very late).
The early Chinese discovery of true steel however and an efficient refining of iron by the 5th century BC along with the remarkable improvements in quality & scale during Han is a unique Chinese technology.
I find that scoring points is always sensitive. It shouldn't be. Best to view each culture in technological isolation as the East & West largely were.
It is possible to score points vis-a-vis East & West technology if we want to pick and choose moments in time but it isn't generally an enjoyable excercise on CHF .
Actually, this process only arrived by nearing/right after the end of the Han. What the Han were supreme at instead was the blast furnace(allowing low carbonated steel) and the ability to raise temperatures to a degree beyond that of anyone else(allowing cast iron).
True mid carbon steel out of the furnace is just after Han. The Han were remarkable both in output of low carbon steel, and the quality of the blades they fashioned into mid carbon steel and the Chinese had also been casting pig iron from even earlier than this period...a bonus for making tools and farming implements.
In all respects they were very advanced at this stage.