It belongs to the Martensitic stainless steel group.
The martensitic stainless steel, which has improved machinability through the addition of phosphorus and sulfur, is a material that offers good mechanical properties along with good corrosion resistance. The addition of phosphorus enhances the steel's cuttability and machinability. However, the addition of sulfur can decrease corrosion resistance, weldability, and formability. Therefore, it is important to carefully balance the additions of phosphorus and sulfur in order to achieve the benefits of improved machinability while considering the impact on corrosion resistance, weldability, and formability.