You must be registered for see images
Hashirama can die with a mere Kunai. His Durability is no other than an ordinary Human in Naruto. The only difference is that in sage mode he has a stronger body and the so named healing ability where everyone thinks he has in base.
The only ninjas that has steel body is the 4th and 3rd Raikage and no other.
Look at this Hashirama:
You must be registered for see images
As long as he has chakra he should heal but doesnt which means he has regenerating ability only in sage mode as long scans says otherwise.