New truck. Stainless Steel exhaust?????

[Greenleaf]

Hey, Guys... ...





My co-worker just now replaced his 1989 1/2 ton GMC w/ a fresh unit. I told him that I will replace my 1990 Dodge Ram Diesel when it wears out.



So he gets all the options. I don't know who he got all the options as it was in stock/on the lot. But he told me he REQUESTED the s. s exhaust pipe. So I set a magnet on the tail pipe and it stuck fast .



He then told me that "Todays stainless is magnetic"



So I take my magnet to the box of s. s. bolts I just recieved from NAPA and they are NOT magnetic.



So someone told him a bunch of BS or he is full of it himself... .....



Which is it?



He also tells me that an automatic slack adjuster on heavy trucks and buses only operate the adjustment when the vehicle is backed up! :-laf

 

[JLEONARD]

There are magnetic stainless steels. We use them every day making solenoid valves.

Some of the marine harware available in stainless steel are magnetic.

I read somewhere that the magnetic grades are not as corrosion resistant.

 

[bmoeller]

There are magnetic stainless steels.

Tends to be softer, as bolts go.

I read somewhere that the magnetic grades are not as corrosion resistant.

That is true. The cheaper T409 SS that is sometimes used in SS exhaust is magnetic and will rust.

The T304 typically won't rust for a VERY long time. But depends on the operating conditions it is in. Road salt still affects it, but takes longer.

Also, extreme heat (as in welding) can allow some SS to rust.