Re: Polished Stainless Steel for Tractor Exhaust??

Posted by T_Bone on July 11, 2006 at 22:38:11 from (4.240.42.128):

In Reply to: Polished Stainless Steel for Tractor Exhaust?? posted by migraine on July 11, 2006 at 20:44:49:

Hi migraine,

In order for the SS to color fast on the outside of the pipe, the pipe would have to be held at a certian temperature for a specific time for a given exhaust temperature and will be dependant on the pipe wall thickness.

On the common 300series SS that temperature should be about 900º too 1100º for about 10min on a sch10 pipe. On a sch40 pipe that may well be 30min or longer.

Sch10 pipe is about .120" wall thickness and Sch40 pipe is about .188 wall thickness.

And then there's the surrounding ambient tempature to consider as well the front of the pipe or the heal of the pipe. The heal will color fix much faster as it's protected from the cooling air of forward movement.

And then there's the velocity of the exhaust gas to consider.

As you can see alot of unpredictables to consider but generally the thicker the pipe wall the less problem with the pipe becoming color fast.

Also my tempatures and heat soak times are ball park numbers.

T_Bone

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