Spring steel of high mechanical resistance and high resistance corrosion.

DISCOVERED A spring steel HIGH CORROSION RESISTANCE AND HIGH STRENGTH, which has excellent traction without reducing heat treatment AFTER WINDING HOT, AND HAVING A FORCE 1900 MPa or more by hardening and tempering AND EXCELLENT CORROSION RESISTANCE. Spring steel containing, by mass percent, 0.3-0.6% C, 1.0-3.0% 0.5-1.5% Mn and Cr and 1.0% or less (excluding 0%) of Ni and / or 0.1-0.5% Mo, the balance being ESSENTIALLY Fe and unavoidable impurities, where SATISFIED ELEMENTS THE FOLLOWING REQUIREMENTS: 2.5 <= (FP) <= 4.5 and 2.0 <= (FP / log D) <= 4.0, where d is the diameter (MM ) WINDING MATERIAL AND FP = (0.23 [C] +0.1) X (0.7 [SI] +1) X (3.5 [MN] +1) X (2.2- [CR] +1) X (0.4 [NI] + 1) X (3 [MO] +1) in which [ITEM] REPRESENTS THE PERCENTAGE OF MASS ELEMENT.