Decentanium is in every way 'decent', and can have any abilities the user of the word pleases.
(it can be stainless, unbendable, unbelieavably flexible, right away indestructible etc.)
The name resembles a combination of the words "decent" and the obligatory word ending to several metals and alloys, "-anium" (like in Titanium)
It is mostly used in a comedic matter.
You should've used decentanium