Full-Race Geoff

This post is not about who makes what, who think their crap is something worth anything, or any speculation.

This thread is going to be about solid data on Stainless Steels, their compositions, their behaviors under elevated temperatures, and their response to thermal, flexural and residual stresses. Not about anything but education.

Javier and I spent the better part of this evening at the library gathering data on fatigues from heat cycles on stainless steel, and what we found was very eye opening. We will be posting over the next couple of days the results, and many currently held misconceptions will be cleared up. Please dont respond to this post with any trash talk, banter, or anything except intelligent comments. Also, please do not quote any websites which sell material without solid numerical data. This is for hard, unbiased data only.

Thanks, i look forward to the discussion. Its now 148 AM, tomorrow (today) we will begin the absolute truths of stainless steels.

UberTeg

321 cuz it costs more

Full-Race Geoff

pretty funny, but please delete that post. I really want this thread to be a real one, thanks

Zero_son

Will this be 'just' for stainless? Could you do one on mild-steels too please? Like cast and the such.

PWRVTEC

What about the properties of 625 Inconel?

GreddySi99

Well I can add this hope it is relivant
Basic # system for steels
1xxx carbon steels
1xxx plain carbon
11xx resulfurized free maching
12xx resulferized, rephosphorized free machining
13xx manganese steels
15xx high manganese steels
2xxx nickel steels
23xx 3.5% nickel
25xx 5.0% nickel
3xxx nickel-chromium steels
31xx 1.25% nickel; 60% chromium
32xx 1.75% nickel; 1.0% chromium
33xx 3.50% nickel; 1.5% chromium
30xxx corosion and heat resisting steels
4xxx molybdenum steel
40xx carbon-molybdenum
41xx chromium molybdunum
43xx chromium-nickel-molybdenum
46xx nickel- molybdenum
48xx nickel- molybdenum
5xxx chromium steels
51xx low chromium
51xxx corosion and heat resisting steels
52xxx medium chromium
6xxx chromium-vanadium steels
61xx 1.0% chromium; .15% vanadium
86xx nickel-chromium-molybdenum steels
87xx nickel-chromium-molybdenum steels
93xx nickel-chromium-molybdenum steels
98xx nickel-chromium-molybdenum steels
92xx manganese-silicone steels
94xx manganese-nickel-chromium-molybdenum steels
hope that helps out somewhat

Jason kiDD

Bump, waiting for more info!!

ffgeon

i think geoff is in school right now. but we should see a post before the day is through

AVATAR

Great! Anxiously awaiting friendly debates. . .

*Boostwerks*

Could you please include cast iron as well (such as RevHard)...?


Thanks
Bryson

Full-Race Geoff

its taking way longer to compile all this data than we realized, were working on it now, few hours are gonna be needed.

were gonna cover the stainless first, then get to the others.

Also we just ordered some ASTM journals on this stuff, but they might take 3 weeks to get to the school library.


[Modified by FFgeoff, 5:51 PM 2/27/2003]

Quick 200k Mile Motor

Is this for a term paper or final?

Arturbo

You call this a hobby?

ffgeon

yeah, this is what geoff does for fun.

GZERO

I always have tought that metals are very interesting, cuz there are infinity of knowledge and they keep learning and doing stuff. I don't know a thing about them, but i always tought it was something amazing.
I dont think he is loosing his time at all.
good luck and to this thread

Full-Race Geoff

nah, its just something i should have done a long long time ago.

i have never seen any real documentation on this subject, so i guess its something that someone should do, and fortunately we have the resources to do so, i dont think there are too many people on this board with the amount of technical data at their disposal that we have at our engineering library.

but seriously, there is so much more data to go through than we realized. this thread may become one in installments... sorry for the suspense, maybe i shouldnt have started this post until i had all the data organized... it will be worth the wait.

ffgeon

if i have to modify this one more time im gonna kill u. get ur shiza together, your behind man!


[Modified by ffgeon, 7:21 AM 2/28/2003]

SIXTYdashONE

His mind wont stop working, which is grounds for a meltdown sooner or later .. and btw, ffgeon your avatar still scares the **** out of me..

SIXTYdashONE

The more you single me out, the more of a posibility you have of getting banned, so by ALL means, keep pushing the envelope.. its snotty ******** liek you that take the fun out of posting here..

Full-Race Javier

thats what jon really looks like.....its what happens when u weld for long periods of time

Lei Siew Long

for educational posts to clear up misconceptions or to actually apply these theories to real world situations.

TurbothisLS

what material properties are you going to look at?
young's modulus
HRB hardness
Modulus of Elasticity

which ones would be useful in a manifold?
i would think that you want some elasticity over hardness to prevent cracking
we did tension tests on several metals and the harder ones broke first, SS was the only one that was both hard and still had some sort of elasticity

racerxadam

What happened to this? I'm interested in material selection and where to get it. I hope taking this to the top doesn't start the bickering back up that was going on in this thread.

Justin Olson

"Out of my 1987 copy of materials selector,

304 "Parts fabricated by welding that cannot be annealed. Generally limited to service up to 800F"

316 "Processing equipment exposed to severe corrosive media. Stressed parts that operate at high temperatures."

321 "welded equipment used in the unannealed condition and exposed to corrosive conditions. Equiment that must operate in the sensitization rande 800-1650F.


TCE of 304 9.6
TCE of Mild steel 8.4 10^-6in/in/F
Oh ya how about cast iron, 6-7.4

Here is your homework, over 3" what is the difference in "in" at 1000F between the two materials. Now look at 20", you can see the issue with flange expansion. You can also see that Mild Steel isn't helping all that much. Cast Iron would be better. It is mostly about being smart with the design. Cutting the flange into 4 pieces will keep it from sheering the studs.

HTH,
Justin

Drew Peacock

Just bring up those old Super T threads he has been here done that and got banned.