Strip material for springs

[israelkk]

I am looking for the minimum guarantied tensile strength of Elgiloy strip 1 mm (0.040&quot thick? It is intended for torsion spring design.

Is there a stronger metal commercially available?

 

[unclesyd]

If you are looking just for strength there are a few materials that have higher Tensile strength. Availability maybe a problem with some of the materials.

Elgiloy is one of the better materials around for springs. It offers corrosion resistance as well as temperature resistance. It also carries a high price.
You can get Elgiloy with a T.S. from 200,000 to 319,000 psi. Or 1400 N/mm^2 to 2200 N/mm^2


Check with the following for available spring materials.

http://www.dracospring.com/index.htm

http://www.associatedspring.com

http://www.alloywire.com

 

[israelkk]

unclesyd:

Thanks for the info.

But I need the exact guarantied minimim tensile strength (according to any available spec such as ASTM, MIL-STD, AMS etc). The web addresses in you answero not give what I need.

I even have the data sheets I received few years ago from Elgiloy but even them give only typical values and the value sare for thicknesses up to 0.025".

I have a very strict design problem where I need to design a torsion bar spring in a very tight space. I seems that it can be done only with a stack of few long strips 1 mm thick ~12 mm wide. The spring will be loaded for constant sustained load for many years so a relaxation is a real issue. I have to design the torsion bar based on the minimum guarantied UTS.

 

[unclesyd]

I would contact Elgiloy directly with you requirements and see if they can give to the material to your specification. Elgiloy develops it properties by heat treatment so you should be able to procure the material to your specs. Every time we used it we took what was available/in stock as the quantity was small.
Elgiloy has very low relaxation up to 350°C.

The material standards are UNS R3003, AMS 5833, AMS 5876, and ASTM F1058

As I mentioned ion the previous post if you don't need the temperature and corrosion resistance you could look for more readily available materials.

http://www.elgiloy.com

 

[israelkk]

unclesyd:

Currently the candidate is 17-7PH with UTS=240 ksi (minimum guarantied).

I beleive Elgiloy is stronger.

As you mentioned, the temperature is not a problem, what other readily available materials can you reccomend and where I can get the minimum guarantied desired UTS values.

 

[unclesyd]

Elgiloy can be as stated up to 319,000 psi T.S. Like i say all may date is from tech sheets and all is typical. i don't have access to any current specs.


These are two materials that maybe of use. I would contact each company as to the availability and guaranteed physical properties. I’ve use them both.


Novaloy 280

http://www.novamachine.com/html/novalloy.html

Aermet 100

http://www.cartech.com

 

[NickE]

Just some more input here on spring strip materials. If you need some corrosion resistance and good spring properties w/ high fatigue resistance and high tensile strengths you might want to try: Sandvik 7C27Mo2, a modified 420 ss for flapper valve applications. 17-7 does have higher corrosion resistance thou.

nick