Spring out of patented drawn wire

Treatment :  patented - drawn
Magnification :  200 : 1
Etching medium :  3 % alcoholic nitric acid
Sampling / Specification :  longitudinal
Testing result :

sorbite and lamellar pearlite

stretched crystalline structure

Treatment :  patented - drawn
Magnification :  500 : 1
Etching medium :  3 % alcoholic nitric acid
Sampling / Specification :  longitudinal
Testing result :

ca. 75 - 80 % sorbite and 20 - 25 % lamellar pearlite

stretched crystalline structure

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