65Mn steel plate, manganese enhances quenchability; φ12mm steel can be quenched in oil, with less tendency for surface decarburization than silicon steel. Its comprehensive mechanical properties after heat treatment are superior to carbon steel, but it has overheating sensitivity and temper brittleness. Suitable for small-sized various flat and round springs, cushion springs, spring worms, and can also be used to make spring rings, valve springs, clutch springs, brake springs, and cold drawn wire cold coiled spiral springs.