304 SS rusting in two weeks?

[Anorax]

Originally Posted by ottopilot

Anybody knows what the stock tips are made from (not trying to high jack but just for comparison's sake)... they looks pretty damn good after a whole winter.

It's actually a fair point, as my stock exhaust were on the car considerably longer throughout winter and I know they don't look like this.

Though, if it's as FT-86 SpeedFactory suggests (road grime, etc) the stockers don't stick out much either.

[bakerr6]

ft-86 does bring up a good point. When looking at the pics, I'd say there is a fair chance that could be your problem. I'd take care of it ASAp, so that it doesn't ruin the metal tips

[FrsSwag]

Thats looks pretty bad for 304...

[jr429]

Most Chinese mfgs don't know what metal grade they are getting, they only guess and believe what they are told by the foundry. Back when I was mfg exhausts in China in the early 2000's the whole building boom resulted in a shortage of 304, and they switched us to "302" which wasn't really 302 and ended up rusting. So to be fair the reseller probably didn't know what they were getting but I'm willing to bet you have a metal with a lot of impurities in there....

[tech4pdx]

I feel your pain and I myself wouldn't be happy with that. Far too often, people these days want to make you feel like you should accept defects as "normal". Nothing normal about paying good $$ (hard-working self-earned $$) for something with abysmal quality. Ask the manufacturer to make it right.. at least the tips. I have a Crawford axleback that has been on for more than a couple of weeks and it is just as good as the day it was installed. Oregon doesn't salt, but we don't exactly have the friendliest environmental conditions.

[jr429]

Originally Posted by SkullWorks

this isn't AeroSpace, it is highly doubtful that the "heat lot number" is going to be tracked thru any processes outside the original foundry.

and this isn't the 50's anymore the chance of getting "bad" 304 is not very high. heck 90% of the 302 I buy meets the 304 standard requirements also.

Have you sourced in China before? Buying 304 here in the states is very different than purchasing "304" in china.

[Swift]

Like most here , that should not rust and they are right that just because the manufacturer states its 304 it might not be or be complete shit. I knew a guy interning somewhere in chicagoland who was inspecting our aftermarket/oem wheels for the metal makeup. He said it was scary what wasn't in it and what was compared to what the manufacturer claimed it was.

But to me, it takes a lot more than 2 wks of salt to make 304(good) rust that fast.

Ps- i'm a machinist

[SkullWorks]

Originally Posted by Swift

Like most here , that should not rust and they are right that just because the manufacturer states its 304 it might not be or be complete shit. I knew a guy interning somewhere in chicagoland who was inspecting our aftermarket/oem wheels for the metal makeup. He said it was scary what wasn't in it and what was compared to what the manufacturer claimed it was.

But to me, it takes a lot more than 2 wks of salt to make 304(good) rust that fast.

Ps- i'm a machinist

So then you should be aware of the 3 phases of iron crystal structure and that the product being non magnetic exemplifies that it is in fact of one specific crystaline structure......but you are completely unaware of surface contamination?

[OrbitalEllipses]

Originally Posted by SkullWorks

So then you should be aware of the 3 phases of iron crystal structure and that the product being non magnetic exemplifies that it is in fact of one specific crystaline structure......but you are completely unaware of surface contamination?

[jr429]

Originally Posted by SkullWorks

So then you should be aware of the 3 phases of iron crystal structure and that the product being non magnetic exemplifies that it is in fact of one specific crystaline structure......but you are completely unaware of surface contamination?

Perhaps we should get back to how magnetism is actually detected?

I am NOT a metallurgist but I have paid good money to a lot of metallurgists and material failure scientists for everything from camshafts, valve caps, to seamless extruded piping used to mfg both titanium and SS exhaust systems. As I understand high impurity levels as well as the desire to "half ass" production from the foundry (and yes I have toured seamless tube foundries) can cause this type of rust situation. I have seen this problem myself and shipped entire containers back because of it. On the flip side I have had exhaust systems come back due to defects, etc. from all over the world, some places clearly winter conditions with a lot of salt, and all of the product we produced never exhibited that kind of coating. So as a betting man I would say source material is impure or not truly 304. Maybe I"m wrong, but I've built and sold a lot of exhaust related components...

[No Limit Motorsport]

Two pages of people talking about a dirty exhaust tip with a couple rusty water spots...

[tech4pdx]

Originally Posted by No Limit Motorsport

Two pages of people talking about a dirty exhaust tip with a couple rusty water spots...

Sounds like diarrhea.

[B L U E S L A T E]

Time to whip out that can of Mother's metal polish?

[86_ZN6]

let me know how the results of the polishing and cleaning process