Kroil is worth a try.  it disolves rust.

--- On Tue, 7/6/10, Lee Haefele <[email protected]> wrote:

> From: Lee Haefele <[email protected]>
> Subject: [Liveaboard] Off topic mechanical issue
> To: [email protected]
> Date: Tuesday, July 6, 2010, 11:57 AM
> I have 2 concentric steel pipes, ~6"
> diameter, held together with set 
> screws.  The 2 pipes are within each other, rusted
> tight. This is the 
> adjustable height tube for an aerial lift on a 1 ton
> truck.  It needs to be 
> separated to mount unit to a van.   Have
> tried PB blaster for 2 weeks, tried 
> a 12 ton jack and a huge blowtorch.  No
> movement.  We are trying Coke A Cola 
> next.  What could shrink the rust material?  With
> more disassembly we could 
> apply more heat. (Need to remove wires and hoses.)
> Lee Haefele 
> 
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