Y40Mn high sulfur in carbon free cutting steel, better cutting performance and improve tool life four times, improve production efficiency by 30% compared with 45 steel, high strength and hardness, suitable for the processing requirements of high rigidity parts, such as screw, rod, rack and spline shaft. 

 Chemical composition: carbon, the C: 0.37 ~ 0.45 Si Si: 0.15 to 0.35 Manganese Mn: 1.20 ~ 1.55 Sulfur S: 0.02 to 0.30 Phosphorus P: ≤ 0.05 

 Mechanical properties: tensile strength σb (MPa): (hot) 590 ~ 735; (high-temperature tempering after the cold-drawing state) 590 ~ 785 the elongation δ5 (%): (hot) ≥ 14; (cold) ≥ 17 Reduction of area ψ (%): (hot rolled) ≥ 20 Hardness: (hot rolled) ≤ 207HB; (cold drawing) 179 ~ 229HB