Steel for springs, process of manufacture for spring using...

Details Steel for springs, process of manufacture for spring using... Steel for springs, process of manufacture for spring using...

C - Chemistry, Metallurgy

22

C

C22C 38/50 (2006.01) C21D 9/02 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) C22C 38/34 (2006.01) C22C 38/42 (2006.01) C22C 38/46 (2006.01)

Patent

CA 2633153

The invention relates to spring steel having increased fatigue strength in air and in corrosive environments and high resistance to cyclical slackening. The composition of said steel contains the following components as expressed in percentages by weight, namely: C = 0.45 0.7 %; Si = 1.65 2.5 %; Mn = 0.2 0.75 %; Cr = 0.6 - 2 %; Ni = 0.15 - 1 %; Mo = trace - 1 %; V = 0.003 0.8 %; Cu = 0.1 - 1 %; Ti = 0.02 0.2 %; Nb = trace 0.2 %; Al = 0.002 0.05 %; P = trace 0.015 %; S = trace 0.015 %; O = trace 0.002 %; N = 0.002 0.011 %, the remainder comprising iron and impurities resulting from production. Moreover, the equivalent carbon content Ceq, which is calculated using formula Ceq % = [C %] + 0.12 [Si %]+ 0.17 [Mn %] 0.1 [Ni %] + 0.13[Cr %] 0.24 [V %], is between 0.8 and 1 % and hardness following quenching and tempering is greater than or equal to 55HRC. The invention also relates to a method for producing a spring using said steel and to the spring thus produced.

Acier à ressorts à tenue en fatigue élevée à l'air et sous corrosion et à haute résistance à l'avachissement cyclique, de composition, en pourcentages pondéraux : C = 0,45 - 0,70% Si = 1,65 - 2,50% Mn = 0,20 - 0,75% Cr = 0,60 - 2% Ni = 0,15 - 1% Mo = traces - 1% V = 0,003 - 0,8% Cu = 0,10 - 1% Ti = 0,020 - 0,2% Nb = traces - 0,2% Al = 0,002 - 0,050% P = traces - 0,015% S = traces - 0,015% O = traces - 0,0020% N = 0,0020 - 0,0110% le reste étant du fer et des impuretés résultant de l'élaboration, et dont la teneur en carbone équivalent Ceq, calculée selon la formule Ceq% = [C%] + 0,12 [Si%]+ 0,17 [Mn%] - 0,1 [Ni%] + 0,13[Cr%] - 0,24 [V%] est comprise entre 0,80 et 1,00%, et dont la dureté, après trempe et revenu, est supérieure ou égale à 55HRC. Procédé de fabrication d'un ressort utilisant cet acier. Ressort réalisé en un tel acier.

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