Spring element made from a ferritic chromium steel

Abstract

Spring element, in particular spring rail for wipers, in particular of motor vehicles, with a low tendency to vibrate or a high attenuation, made from a ferritic chromium steel comprising 0.03 to 0.12% of carbon, 0.2 to 0.9% of silicon, 0.3 to 1% of manganese, 13 to 20% of chromium, 0.1 to 2.0% of molybdenum, 0.05 to 1.0% of copper, 0.02 to 0.05% of nitrogen, less than 0.01% of titanium, 0.01 to 0.10% of niobium and 0.02 to 0.25% of vanadium, remainder iron.

1 . A spring element, in particular a spring rail for wipers, made from a ferritic chromium steel, comprising, by weight percent, 
 0.03 to 0.12% of carbon    0.2 to 0.9% of silicon    0.3 to 1% of manganese    13 to 20% of chromium    less than 0.5% of nickel    0.1 to 2% of molybdenum    0.05 to 1.0% of copper    0.02 to 0.5% of nitrogen    less than 0.01% of titanium    0.01 to 0.10% of niobium    0.02 to 0.25% of vanadium, remainder iron.    
   
   
       2 . The spring element of  claim 1 , wherein the steel contains, by weight percent, at most 0.1% of carbon, at most 1.5% of molybdenum, 0.1 to 0.5% of copper and at least 0.03% of nitrogen.  
   
   
       3 . The spring element of  claim 1 , comprising, by weight percent, a carbon content of from 0.06 to 0.1%, a chromium content of from 15 to 18% and a molybdenum content of from 0.8 to 1.5%.  
   
   
       4 . The spring element of  claim 1 , comprising a coercive force ranging from 190 to 320 A/cm and a magnetic saturation ranging from 1.45 to 1.75 T.  
   
   
       5 . The spring element of  claim 1 , comprising a thermosetting powder coating.  
   
   
       6 . The spring element of  claim 5 , comprising a layer thickness ranging from 0.05 to 0.15 mm.  
   
   
       7 . The spring element of,  claim 1 , comprising a damping performance which is adjustable by solution annealing for 0.5 to 60 min at a temperature of 900 to 1100° C.  
   
   
       8 . The spring element of  claim 7 , wherein the damping performance is adjustable by cold-forming with a degree of deformation of over 65%.  
   
   
       9 . The spring element of  claim 8 , comprising a magnetic hardness which is adjustable by tempering after the cold-forming for 0.1 to 1 min at a tempering temperature of 200 to 380° C.  
   
   
       10 . The spring element of  claim 9 , comprising a coating of a hardening temperature which is in the range of the tempering temperature.