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Spring material. Corrosion resistant, Fatigue resistant
6

Spring material. Corrosion resistant, Fatigue resistant

Spring material. Corrosion resistant, Fatigue resistant

(OP)
I need to find an ideal spring material.
Cost is not an issue, so it may be an exotic.
The material must not be poisonous, e.g. no Berylium Bronze. This material would ideally have a Finite fatigue limit (Endurance limit), or at least a high strength up to 10^7 cycles minimum. The product is Musical instrument free reeds. Fatigue makes them go flat. Many instruments have many of them. Harmonica players breath through them.

Any suggestions of materials, and where I might find S-N curves for them appreciated.

Dave Fowler B.E.(Mech)UNSW Australia

RE: Spring material. Corrosion resistant, Fatigue resistant

2
The ideal spring material has the highest ratio of fatigue strength squared divided by elastic modulus.  Thus, titanium alloys, spring steels, and fiber-reinforced composites have the highest ratios.  The next step is to look for suppliers of semi-materials (sheet, plate, rod, etc.) that meet your geometry requirements.  Member TVP probably can supply good suppliers for you.  Good luck.



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RE: Spring material. Corrosion resistant, Fatigue resistant

2
I am not very familiar with the internals of musical instruments, but I am assuming that free reeds require "flat" springs rather than helical compression springs, etc.  Please correct me if I am wrong.  For flat springs that require high fatigue strength and good corrosion resistance, I would recommend investigating stainless steel alloys with the correct spring temper.  

Somers Thin Strip, part of Olin Brass, is a supplier of cold-rolled stainless steel spring materials.  Check out the properties for Spring and Special Spring temper material:

http://www.olinbrass.com/stainlessdag.html

Other producers of high quality, high strength stainless steel strip include Sandvik and Hitachi.  You can obtain more information from their websites:

Sandvik
http://www.steel.sandvik.com/
click on Strip Steel

Hitachi
http://www.hitachimetals.com/products/specialtysteel/

RE: Spring material. Corrosion resistant, Fatigue resistant

The information on Somers was good. They make super full hard 301 stainless with YIELD strength up to 300,000 PSI.

RE: Spring material. Corrosion resistant, Fatigue resistant

It might be possible to make such a piece out of glass or ceramic. Some candidate ceramics are ZrO2, Diamond (ultimate choice) and silicon nitride. You would be surprised that some ceramics can be made with elastic bend capability. They also have superlative acoustic properties and fatigue limits.

I know the ceramic field very well, if you need more info. How many of these do you need?

RE: Spring material. Corrosion resistant, Fatigue resistant

Hi Merlinz,


We are using the material 51420 St. Steel and our application also requires fatigue and corrosion resistance. We are producing components for artificial lims.
Pls find a list of sp.material & astm list

Hope the info is satisfactory...

Ozan

Spring Material ASTM Reference
Music Wire  ASTM A228 (0.80%-0.95% carbon)  
Oil-Tempered MB Grade  ASTM A229 (0.60%-0.70% carbon)  
Oil-Tempered HB Grade  SAE 1080 (0.75%-0.85% carbon)  
Hard-Drawn MB Grade  ASTM A227 (0.60%-0.70% carbon)  
Cold-Rolled Spring Steel, Blue-Tempered or Annealed  SAE 1074, 1064, 1070 (0.60%-0.80% carbon)  
Cold-Rolled Spring Steel, Blue-Tempered Clock Steel  SAE 1095 (0.90%-1.05% carbon)  
Chromium Vanadium  ASTM A231  
Chromium Silicon ASTM A401  
Stainless Type 302  ASTM A313 (18% chromium, 8% nickel)  
Stainless Type 304  ASTM A313 (18% chromium, 8% nickel)  
Stainless Type 316  ASTM A313 (18% chromium, 12% nickel, 2% molybdenum)  
Stainless Type 17-7  ASTM A313 (17% chromium, 7% nickel)  
Stainless Type 414  SAE 51414 (12% chromium, 2% nickel)  
Stainless Type 420  SAE 51420 (13% chromium)  
Stainless Type 431  SAE 51431 (13% chromium)  
Spring Brass  ASTM B134 (70% copper, 30% zinc)  
Phosphor Bronze  ASTM B159 (95% copper, 5% tin)  
Beryllium Copper  ASTM B197 (98% copper, 2% beryllium)
http://content.engineering.com/engineering/templates/article/0,1016,BC936B498834A4409CEFD7C703CF6349-2D27B2F55D2B7B42ABC22FF8B2616241-34D7FEEA970E6B4591F25E6CBED16854-,00.html

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