Standard ASTM E290 | Developed by Subcommittee: E28.02, 180 degree bend test for Wire ??? 2

[LCform]

Hi All

I am evaluating if I should do a Tensile , torsion or bending test on the steel wires that we use for cold forming, since I need to use the flow curves in simulation , I was doubting that if it changes so much on different lots of material , and different diameters, or it's enough to do the test once , since there is no heat treatment we do on the material during production , just that the wires are anealled in their production , and the are C4D steel , so low carbon, but I need to know well about their deformability to simulate the deformatin correctly

what are your advices ?

 

[EdStainless]

Are you buying this to a spring wire spec?
The properties will change with diameter, typically smaller wire is stronger.
The spec will have minimum tensile requirements and it will call out the testing.A bend test is common with wire specs.

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P.E. Metallurgy, Plymouth Tube

 

[LCform]

Thank you very much for your attention , First I didn't get what you meant by spring wire spec, but if you meant what it is used for, it's for bolt production, not for spring, if you meant how the package of the wire is, it is in a hank, sorry that I didn't understand your comment

And one question, why the geometry parameters are not mentioned in metal forming books and handbooks like no where the effect of diameter is studied on the maximum strain or hardening rate? Just mostly in failure or damage?

Shall you also please tell me some specific standards to use? I think there are so many, some regarding to deformability, some to microstructure

 

[EdStainless]

So this is rod for heading, you will be getting what you get unless you order enough from the mill to specify desired properties.
The spec will depend on the alloy and what spec you are trying to make bolts to meet. Often the end product spec will tell you which raw materials are allowed.

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P.E. Metallurgy, Plymouth Tube

 

[LCform]

Thank you so much

the steel is C4D , so it's low carbon , by end product, if you mean the application , the mechanical properties of them is not important cause it's gonna be used in wood, so only important thing is that it doesn't exceed forming limit. For that I need to have an apropriate test

 

[CoryPad]

Tension testing is a better option than torsion or bend testing for obtaining properties for simulation. You only need to do this once if you are only using the information for modeling. Some companies that cold form parts use upsetting tests of each lot of wire to insure that the incoming material quality (e.g. nonmetallic inclusions) does not result in part defects (e.g. cracks).