Turbo to manifold studs: 300ZX Inconel or 304SS threaded rod (Hey, Leafy, over here) - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 01-14-2014, 07:56 PM   #41
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Vlad, what did you use to cut these studs down? Was it a biotch?


It wasn't bad at all actually. At least not what I expected.

I'm still looking for the part number too. I thought I had it but can't find the receipt
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Old 01-14-2014, 08:59 PM   #42
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9YA9-21-008
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Old 01-15-2014, 08:17 AM   #43
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Isn't Inconel a grade of stainless? 718 pops into my head.

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Old 01-15-2014, 08:23 AM   #44
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Isn't Inconel a grade of stainless? 718 pops into my head.

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Its not even a type of steel since the majority of the alloy is nickle rather than iron. Maybe it was developed from stainless steel research.
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Old 01-15-2014, 10:55 AM   #45
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Nickel is one of the ingredients that makes stainless steel stainless.
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Old 01-15-2014, 11:01 AM   #46
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Nickel is one of the ingredients that makes stainless steel stainless.
Yes it is. But stainless has normally around 1-10% nickel and around 80% iron, inconel has around 50-75% nickle and 5-10% iron.
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Old 01-15-2014, 12:02 PM   #47
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In most metal material listings I see, Inconel is usually listed separately from the various SS alloys. I think Inconel used to be a tradename (like Xerox) that ended up getting genericized.

Here's an example. This link shows thermal expansion coefficients which shows why one might prefer Inconel over a heat resistant SS for consistent clamping force in a cast iron manifold/turbine housing application:

Coefficients of Linear Thermal Expansion

For real technical data on the specific alloy in question, I always go to the metal vendor's alloy-specific tech data sheet. There are different alloys with varying properties that are all sold as "Inconel."
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Old 01-17-2014, 12:41 AM   #48
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Isn't Inconel a grade of stainless? 718 pops into my head.

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Shouldn't you know?
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Old 01-19-2014, 07:44 AM   #49
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C'mon Mr. Green, sure I should know. I do know. I have known. I was born knowing.
I'll die knowing.

We ought to be calling the stuff CRES.

Corrosion REsistant Steel is the proper upper class name for the category of metals referred to by the less than privileged by the semi-literate slang term of "stainless steel."

"............ so it is written."

Sorry, I just couldn't resistant....

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Old 01-19-2014, 05:31 PM   #50
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But Inconel is NOT Steel. Its it is a nickel super alloy. Steels of any kind, stainless or otherwise, the primary alloying element is iron. The primary element in all alloys of inconel is nickel.
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Old 01-19-2014, 10:05 PM   #51
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Inconel - Wikipedia, the free encyclopedia

Wikipedia, yo.

Name was indeed a trademark, so they say...
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Old 01-22-2014, 09:05 PM   #52
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But Inconel is NOT Steel. Its it is a nickel super alloy. Steels of any kind, stainless or otherwise, the primary alloying element is iron. The primary element in all alloys of inconel is nickel.
Thank you! Inconel isn't even kind of stainless steel. One of the interesting properties of inconel is that you can actually control the grain formation such that your part consists of one giant inconel crystal thus eliminating the potential for creep along grain boundaries, great for close tolerance turbine blades.
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Old 01-24-2014, 09:41 AM   #53
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Shooter,
You appear to be a metalurge. Can you tell me if stainless 718 and inconel 718 are the same thing? I find them cross listed often. They also appear to have the same alloying elements. Several other grades of inconel also cross ref to stainless grades. Iron, chrome, nickel, moly, cu, and some real odd ***** are common to most.

Is grain structure, or the single grain, solely a heat treat process allowed by the alloy, or is workable with various alloys?

I'm not sure all this is terribly pertinent, but it's interesting, nevertheless.

corky
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Old 01-24-2014, 11:51 AM   #54
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Quote:
Originally Posted by Corky Bell View Post
Is grain structure, or the single grain, solely a heat treat process allowed by the alloy, or is workable with various alloys?

I'm not sure all this is terribly pertinent, but it's interesting, nevertheless.

corky
Single crystal metallic structures are the result of specialized manufacturing processes, and are not limited to Inconel alloys.

HOWEVER, single crystal Nickel based turbine blades are the largest and most common use of "single" crystal mettalic parts applied in industry.

Most of the other single crystal mettalic stuff I've seen is University/Labratory research and don't necessarily have industrial applications.

Tin whiskers are a "neat" example of another type of single crystal (at least in their early growth stages) metallic structure.
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Old 01-24-2014, 05:40 PM   #55
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Corky,

I'm full of predominantly useless trivia, but I'm afraid I'm not the engineer you are looking for.
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Old 01-24-2014, 05:44 PM   #56
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Corky,

I'm full of predominantly useless trivia, but I'm afraid I'm not the engineer you are looking for.
I think he meant shooter smitty.

I've personally only ever seen 4xx, 3xx, 9xx, and 2xx(x) stainless alloys.
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Old 01-24-2014, 08:41 PM   #57
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Too much shootin' up in hurr. I gets confused easy.
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Old 01-25-2014, 01:37 PM   #58
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Quote:
Originally Posted by Corky Bell View Post
Shooter,
You appear to be a metalurge. Can you tell me if stainless 718 and inconel 718 are the same thing? I find them cross listed often. They also appear to have the same alloying elements. Several other grades of inconel also cross ref to stainless grades. Iron, chrome, nickel, moly, cu, and some real odd ***** are common to most.

Is grain structure, or the single grain, solely a heat treat process allowed by the alloy, or is workable with various alloys?

I'm not sure all this is terribly pertinent, but it's interesting, nevertheless.

corky
I'm not a metallurgist, just an ME that's taken a few materials courses, but that was quite a while ago at this point. I'd never heard of "stainless 718" so I googleed it and it does appear to be a nickel based super-alloy. I'm not sure why they choose to call it 'stainless" but you'll note that they don't call it "stainless steel" The distinction as Leafy stated is that Inconel, and other nickel based super-alloys primarily nickel with alloying elements whereas a steel is iron based (with carbon of course) with alloying chromium being the defining characteristic of stainless steel.

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Old 01-25-2014, 09:19 PM   #59
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Yeah I also googled stainless 718. Got websites pages for inconel 718 and the sites had a ribbon or whatnot that said stainless steel.
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Old 08-27-2014, 04:19 PM   #60
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bump from the grave.

Has anyone had issues with the outlet flange to downpipe studs? Mine seem to be backing off some. I'm considering the oem Nissan ones for replacements just to be safe.
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