3J58 is a Fe-Ni-Cr-Ti ferromagnetic precipitation-strengthened constant elastic alloy. After solution treatment, it has good plasticity, low hardness and is easy to process and form. Strengthening and good constant elastic properties can be obtained by post-aging treatment of solid solution or cold strain. This alloy has a small elastic modulus (or frequency) temperature coefficient, a high mechanical quality factor, good wave speed consistency, high strength and elastic modulus, small elastic aftereffects and hysteresis, and a low linear expansion coefficient. Good processing performance and good corrosion resistance.