Steel vs Aluminum

In comparing relative advantages of steel vs. aluminum for displacement hulls, I vacillate. The arguments for both can be compelling -- and I often take the position of the last good argument I've read. I'd like to restrict it a little, and get some opinions.

If comparable hulls are built to the same strength and stiffness, and state-of-the-art coatings are correctly applied --- what factors tip your preference?

 

Egad.
I like aluminum, myself. It's lighter, and I like to go fast. Then again, I don't usually carry 20,000 gal of diesel, nor do I carry a sewage truck on deck. Steel does seem to yield a cheaper boat, and one that can take more of a beating (sometimes). Steel is also less sensitive to fatigue and can be welded with conventional non-IG gear. In the event of an impact, though, Al seems to buckle where steel cracks, and I'd rather have a bent hull than a broken one.

 

I think resale value is higher for aluminium, but maybe harder to weld by an amateur, http://www.fairmetalboats.com/metalBoats.htm :

The pros and cons of steel Vs aluminum are very dependent on whether you plan to build yourself and the performance criteria of the design. See our write-up on "About Metal Boats" for more info. Generally we believe aluminum's more critical welding parameters lead one to starting with at least a completed aluminum hull. The ease of learning and controlling steel welding on the other hand lead it to owner building either from scratch or from a kit.

 

marshmat-

"In the event of an impact, though, Al seems to buckle where steel cracks ..."

I have this impression as well, but can't find any foundation for it. In fact, alot of what I've read argues against the belief. Is there any empirical evidence to support this?

Raggi Thor -

I should have added -- cost and resale issues aside, which do you consider a preferable hull material.

 

tipping factors

Apart from weight, the factor that tips my preference is cost or labour of maintenance. The higher price of aluminum over the lifetime of a hull is more then compensated for by the low cost of maintenance.

 

Now with anti-rust technology on the verge of peaking....... Steel option would be better, better rust control, strength, smooth welding, solid feeling, unlimited size of ship with this material, ........... lots cheaper to do. My thought.

I used to be aluminium minded. Old stuff work better and technology improved it.


WDH

 

"Now with anti-rust technology on the verge of peaking......."

The big boat guys would love to learn of this tech.
Do you realize what it costs to loose $400,000 in charter a day to get the hull painted ?

The folks that own the oil and gas tankers of the world will be waiting breathlessly!!

Don't believe advertising hype , believe decades of experience.

FAST FRED

 

U have a tanker made from ALUMINIUM renting for 400,000 US$ a day? WOW................... unbelievable, big aluminium..... need to tell my mom