spring steel, spring steelmaking process and spring steel fabricated with such steel

摘要

SPRING STEEL, SPRING STEEL MANUFACTURING PROCESS AND SPRING MANUFACTURED WITH SUCH STEEL. The present invention relates to a spring steel of high air fatigue strength and under corrosive conditions and of high cyclic deformation resistance, of percentage composition by weight: C = 0.45 - 0.70%; Si = 1.65 - 2.50%; Mn = 0.20 - 0.75%; Cr = 0.60-2%; Ni = 0.15-1%; Mo = dashes - 1%; V = 0.003 - 0.8%; Cu = 0.10-1%; Ti = 0.020 - 0.2%; Nb = dashes - 0,2%; AI = 0.002 - 0.050%; P = dashes - 0.015%; 5 = dashes - 0.015%; O = dashes - 0.0020%; N = 0.0020 -0.0110%; the balance being iron and impurities resulting from the preparation, and whose carbon content equivalent Ceq, calculated according to the formula Ceq% = [C%] + 0,12 [Si%] + 0,17 [Mn%] - 0 , 1 [Ni%] + 0,13 [Cr%] - 0,24 [V%] is between 0,80 and 1,00% and has a hardness greater than or equal to 55 after hardening and tempering. HRC.