What are the characteristics of 65Mn round steel?

65Mn round steel: manganese improves hardenability, φ12mm steel can be hardened in oil, and the surface decarburization tendency is smaller than that of silicon steel. The comprehensive mechanical properties after heat treatment are better than carbon steel, but it has overheating sensitivity and temper brittleness. It can be used as a variety of small-sized flat and round springs, cushion springs, spring springs, and can also be used to make spring rings, valve springs, clutch reeds, brake springs and cold-drawn steel wire cold-rolled spiral springs.

65Mn round steel is commonly used as spring steel, and the final heat treatment is quenching and tempering. 65Mn steel is often used for machining finished products and is also a typical material for cold work die steel. Among them, round steel is the most widely used.

65Mn round steel chemical composition

C0.17-0.25, Si0.17-0.37, Mn0.35-0.65, P≤0.035, S≤0.035, Ni≤0.30, Cr≤0.15, Cu≤0.25

65Mn round steel characteristics

The steel has high strength, high hardenability, and low decarburization tendency, but it is sensitive to overheating, is prone to quenching cracks, and has temper brittleness. In the annealed state, the machinability is good, the weldability is good, the cold deformation plasticity is low, and the strip can be subjected to general bending and forming processing.