Tuesday, February 10, 2009

Not ordinary fires

I do not want to say much about the Australian fires - but this photo of molten metal from burnt cars gives you some idea of their intensity.




For the record - apparently these were aluminium alloy wheels.  The melting point is just under 1000 kelvin.   Way hotter than lead (600 kelvin).  Iron melting point is 1800 kelvin - furnace temperature.  There are incidents of iron being serious impaired (eg children swing sets that collapsed with heat damage) but I have not seen plausible photos of iron melting like this...

J

8 comments:

Anonymous said...

US wildfires regularly melt traffic signs and road delimiters. In this case, could it just have been the battery? Lead has a fairly low melting point. A friends car burned out after an accident and his SCUBA weight belt made of lead completely disappeared in the trunk. (Not to put down the magnitude of the Australian fires. A lot of the remainders will probably be toxic. Not sure what happens with the sulfuric acid etc.)

John Hempton said...

I have heard reports of engine blocks melting. But I have not seen pictures.

Steel clearly melted in some places.

Anonymous said...

I am very skeptical of that picture.

Steel does not melt well. Iron might. Lead does. There is a lot of steel in that picture that didn't melt.

The "flows" seem to be coming from the "axle assembly", there could have been a cast iron housing on it.

Shame about the fires.

John Hempton said...

Later comments on that photo describe the metal as the alloy wheels of the car.

What is the alloy? I have no idea...

But the things that are iron based that melted are things like childhood swings.

It seems that zinc coated metal didn't seem to melt. And lots of steel didn't.

---

Whatever - I know some of these towns. Or knew them. They no longer exist.

J

Anonymous said...

All things move toward their end.

Anonymous said...

that looks like aluminum, which also has a low melting point. aluminum is used in engine blocks, pistons, heads, trannie cases, wheels, radiators, etc.

Anonymous said...

Picture #23

http://www.boston.com/bigpicture/2009/02/bushfires_in_victoria_australi.html


I've had a car burned once and the aluminium cilinderhead was melted and the chassis buckled and some of these places look like a blast furnace.

John Hempton said...

It was aluminium - which has a medium melt point - just shy of 1000K.

I have seen a few photos now of engine blocks (or at least the aluminium heads) melting.

J

General disclaimer

The content contained in this blog represents the opinions of Mr. Hempton. You should assume Mr. Hempton and his affiliates have positions in the securities discussed in this blog, and such beneficial ownership can create a conflict of interest regarding the objectivity of this blog. Statements in the blog are not guarantees of future performance and are subject to certain risks, uncertainties and other factors. Certain information in this blog concerning economic trends and performance is based on or derived from information provided by third-party sources. Mr. Hempton does not guarantee the accuracy of such information and has not independently verified the accuracy or completeness of such information or the assumptions on which such information is based. Such information may change after it is posted and Mr. Hempton is not obligated to, and may not, update it. The commentary in this blog in no way constitutes a solicitation of business, an offer of a security or a solicitation to purchase a security, or investment advice. In fact, it should not be relied upon in making investment decisions, ever. It is intended solely for the entertainment of the reader, and the author. In particular this blog is not directed for investment purposes at US Persons.