Looking for material porperties on AR-200? 1

[Silentnox]

I have a mill run in my hand for AR-200 sheet metal but I need a few more paramters then what is on the mill run. I cant find AR200 on matweb so I assume it is just a common trade name. Can anyone offer me an actual code for this product?

Thanks a bunch.

 

[unclesyd]

Medium abrasion/wear resistant steel in you case AR200 is a non-structural grade of plate that doesn't carry any specifications other than the 200 Brinell, average.

http://www.ipsco.com/Products/Plate_Literature/AR200_2006-10-30.PDF

http://www.chapelsteel.com/alloy-abrasion-resistant.html

 

[Silentnox]

Thanks!
I should have guessed that was the answer and its not even monday today... I guess I will need another excuse.

-Jason

 

[Silentnox]

Actually while im here one more question:

We just got a new accupress press brake and I am just adding all the materials we use to its software. There are a few parameters that I am unclear about. Perhaps you could enlighten me.

The program asks for the following(with no units) along with the data that was already entered from factory for A36

Strain hard - 0.17
Strength - 676
PreStrain - 0
Yield Stress - 242
Youngs Modulus - 200000
Poisons Ratio - 0.3
Fracture strain - 0.24
Coulombs - 0.1
UTS - 500


So my question would be what measurement is being used to give a hardness < 1,
what is "strength"?
Is fracture strain a % elongation at failure,
What do Coulombs have to do with press braking?

 

[CoryPad]

Strain hard is the strain hardening exponent, not a hardness.

Strength is the Ultimate Tensile Strength.

Fracture strain [&epsilon;]_f is the non-dimensional value of strain at fracture. Percent elongation is a commonly used substitute, except that it is 100 [&middot;] [&epsilon;]_f .

Coulomb is referring to Coulomb's law for friction.

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[Silentnox]

Thanks for the tip,

However, I dont think Strength is Ultimate Tensile Strength as there is a UTS parameter. I do think that strength would be the fracture point assuming constant volume in the yield section of the curve.

Im still trying to figure out how to get this true strength as well as the strain hardening exponent n.

-jason

 

[CoryPad]

If it isn't Ultimate Tensile Strength, perhaps it is the strength coefficient K. See equation 10 here:

http://www.key-to-steel.com/Articles/Art42.htm

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[Silentnox]

Is the K in Sigma = ke^n the same as the K for bulk modulus?

 

[CoryPad]

No.

 

[TVP]

I agree with CoryPad, the "Strength" term is the Strength Coefficient K that is used in a simple power law hardening description. Bulk Modulus is something else entirely.

 

[Silentnox]

Ha! I just noticed I spelt the title wrong...sorry

So if the K and the n are both experimentally determined how can I find them? I have yet to see AR200 in any lists for k and n values. Maybe im way off the mark on this one and you can calculate them somehow.

???

-Jason

 

[TVP]

No, K and n cannot be calculated, they must be measured. Just to be clear, AR200 is for all practical purposes a meaningless designation. You are not going to find very much information using this designation because it is not a standard grade, etc. You will need to either test your actual samples, or try to find references that have data on similar steels (chemical composition, thermomechanical processing, etc.).

 

[Silentnox]

TVP, you hit the problem on the head. AR200 designates Brinell Hardness # of 200. So how does that affect my k and n values?

They both should be higher should they not?

I dont have the capabilities of running a strength test on material?