Material 1.7103

Spring steel

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1.7103

Standards

HDIN / EN US-Standard AFNOR UNI JIS request
67SiCr5 request

Material Category: Spring steel

Applications

Coil springs, valve springs, disc springs

Heat Treatment

Hot forming 820 - 900 C° / 850 - 1050 C°
Normalizing 850 - 880 C°, air cooling
Soft annealing (+A) 640 - 680 C°, cooling furnace
Hardening 830 - 860 C°, cooling oil
Temper 430 - 500 C°, cooling air

Chemical Composition

C % Si % Mn %  P % S % Cr %
0,62 - 0,72 1,20 - 1,40 0,40 - 0,60 max 0,035 max 0,035 0,40 - 0,60

 

Mechanical Properties

naturhart  >= 310 HB 30
weichgeglüht <= 240 HB 30
   
federhart  
Streckgrenze Re >= 1350 N/mm²
Zugfestigkeit Rm 1500 - 1700 N/mm²
Bruchdehnung (A5,65) >= 5 % 
Einschnürung (Z) >= 20 % 
Kerbschlagarbeit (DVM) >= 14 Joule 

 

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