Manganese increase hardenability, φ12 mm steel oil can hardenability, surface decarburization tendency smaller than silicon, the mechanical properties after heat treatment is better than carbon steel, but the thermal sensitivity and temper brittleness. Used for a variety of flat, small size, round spring, cushion spring spring spring spring ring can also be produced, valve springs, clutch springs, brake springs, cold rolled and cold drawn steel wire coil spring. 

 Excellent overall performance, such as mechanical properties (particularly elastic limit, ultimate strength, yield ratio), anti-bomb less performance (ie, resistance to the decreased elasticity of performance, also known as anti-stress relaxation properties), fatigue properties, hardenability, physical and chemical properties (heat resistance, low temperature resistance, oxidation resistance, corrosion resistance, etc.). In order to meet these performance requirements, the spring steel with excellent metallurgical quality (high purity and uniformity), good surface quality (strict control of surface defects and decarburization), the exact shape and size. 

 65Mn steel plate strength, hardness, elasticity and hardenability than 65 steel, thermal sensitivity and tendency to temper brittleness, water quenching the formation of the crack tendency. Annealed machinability can still be cold deformation plasticity, poor weldability. Under moderate load plate spring, 7-20mm diameter coil spring and spring washer spring ring. High wear resistance of parts, such as the grinding machine spindle, spring chuck. Precision machine screw. Cutter. Spiral roller bearings on the ring. Railway rail.