It’s either black blades are coated in armament hardening or not
There is no evidence suggesting they constantly flow or emanate CoA Hardening or have some permanent version of CoA Imbuement going on.
You might be confusing iron and steel but even zoro couldn’t cut steel till after the timeskip
You are confusing Zoro's inability to cut Pacifista/Kuma with his inability to cut steel. Pacifista are made of a material stronger than steel.
Zoro learned to cut steel against Daz Bones, I already posted the panel.

I don't see much going in continuing when it's clear you lack familiarity with the material.
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