steampunk Steam Powered airships?

[Eugenides]

Hey all, so I'm working on a steampunk project and I had a question, and so I figured I might come to one of the nerdiest groups I know of with it. Alright, here goes. So, hypothetically if you had a metal that was as strong as steel but 1/100 of the weight(I am following in the path of all creators everywhere in making a stupid name for a metal cough cough Avatar, cough cough Transformers, mine is ingravisteel). And if you had unlimited helium, could you build a pheasible zeppelin? I'm thinking 150-200 feet with ingravisteel armor plating and rotary guns of the same material. Is this even possible scientifically or should I follow another grand tradition-if science doesn't allow you to do cool stuff, do cool stuff anyway and call it magic?

[Eugenides]

I'm thinking eight propellors btw

[Bort he/him]

Technically, you'd not even need ingravisteel to build an airship. So long as you have enough helium to offset the weight of the cabin, you'd be fine.

Of course, this is where the ingravisteel comes in handy if you're adding armour plating and rotary cannons to it.

Also, what would the offset be? If ingravisteel is 1/100th the weight of steel but just as strong, what's the weakness to it? Or are you aiming it to be counted in with the likes of vibranium, adamantium, transformium (which idiot thought that up?), etc?