Steel or Aluminum

Steel and aluminum are the two materials we use the most in the field of slackline.
Whether aluminum or steel to know which one is best, they are governed by four criteria: Tensile strength (Rm), the yield stress (Re) and yield strength (Rp) All these values ​​are expressed in MPa or N / mm².
The Young's modulus is a value of the yield strength indicating what limit must not exceed the materials as below returns to its original shape, above the material deforms without finding its form.
The aluminum:
-L'aluminium Mechanics has the advantage of being about 2 to 2.5 times lighter than steel by aluminum shade. 
We use "mechanical" aluminum which are in fact of aluminum alloys, the best known in the slackline (7075, 6061, ...)
7075 is the most resistant alloy having the lowest plastic zone so it hardly deform before breaking. He can not stand to be folded so it must be formed under heat and great pressure or being worked on cut blocks.
6061 is a slightly elastic alloy which accepts light folds if the angle is not too large (the majority of the flanges of the pulleys are in 6061).
The biggest weaknesses alloys compared to steel are: they do not prevent when they break, they hardly will deform and will give in one go. And most importantly, aluminum alloys tolerate much less shock than steel. 
Put simply: two identical pieces of steel and one aluminum alloy, undergoing repeated shocks below the limit of elasticity, will break must at some point (because of the rapid changes in states of matter undergoing repetitive deformation, break, ...) Steel held about four times more shocks than aluminum.
Steels  :
are heavier than aluminum, they are also more resistant. The crude steel has the disadvantage of rust so you either protect it or make it stainless.
Even stainless long term rust, using a more corrosion resistant stainless steel more input from other metals fall within its composition will weaken its mechanical strength.
Steels have a larger plastic zone as aluminum, but the steel is solid it will be more brittle. 
the most commonly used steel and stainless steel
S235 electro, classic steel
S355, very resistant steel but should be protected with paint because it is gross.
304 stainless one of the most resistant stainless
stainless steel 316 marine grade, one of the most corrosion resistant but less resistant than 304. 
Finally, in the slackline high voltages and rapid changes of tensions highlight the need to focus on steel; aluminum must above all be outlawed jumplines and longlines where tension variations are enormous.

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