METHOD FOR PRODUCING COLD-FORMED STEEL SPRINGS
The invention relates to a spring (3') and/or a torsion bar (3") produced from a steel wire (1) by cold-forming (20', 20") according to a method comprising the following steps: a) providing a steel wire (1); b) thermomechanically shaping (12) the steel wire (1) provided in step a) above the minimum recrystallization temperature of the steel wire (1); c) cooling the steel wire (1) thermomechanically shaped in step b); d) quenching and tempering the steel wire (1), comprising I. heating (17); II. quenching (18); III. reheating; IV. cooling; e) cold-forming (20', 20") the steel wire (1) quenched and tempered in step d), at a cold-forming temperature, wherein the cold-forming temperature is a temperature below the minimum recrystallization temperature of the steel wire (1); f) dividing (21) the steel wire (1) cold-formed in step e); wherein in the cooling of the steel wire (1) in step c), cooling is performed to a temperature below the minimum recrystallization temperature in such a way that at least a partially ferritic-pearlitic microstructure arises in the steel wire (1).