Phosphorus is generally recognized as a hazardous element in metallic materials. In steel smelting, phosphorus is usually brought in by the raw material. In steel, phosphorus is mainly in the form of solutes, iron phosphide and other alloying elements formed by the phosphide and phosphate inclusions and other states. Iron phosphide hard, affecting the plasticity and toughness of steel, easy to cold brittle, easy to produce segregation in the steel condensation process. Reduces the mechanical properties, easy to produce shrinkage, porosity and other adverse effects in casting. Therefore, in order to ensure the quality of steel, often require elemental analyzers to detect the phosphorus content is controlled at less than 0.06. For some high-quality steel, the phosphorus content is less than 0.03.

However, the presence of phosphorus also has its favorable side. For example, phosphorus can solidify and strengthen ferrite and improve the joint strength of steel. Phosphorus can improve the steel to be cut. In some free cutting steel. Often require elemental analyzers to detect the content of phosphorus up to 0.15. In addition, both phosphorus and copper containing steel has better corrosion resistance. The use of phosphorus on the brittleness of steel caused by the addition of phosphorus in the steel of artillery shells, can improve its explosive power.

Phosphorus chemical industry refers to the phosphorus ore as raw material, through chemical methods of phosphorus elements in the ore processing into products that can be used for human consumption of chemical sub-industry, the basic raw materials are mainly phosphorus ore and sulfur. Phosphorus chemical products are mainly divided into two main categories: one is phosphorus fertilizer represented by monoammonium phosphate, diammonium phosphate and calcium hydrogen phosphate; the other is phosphoric acid and phosphate widely used in industry, agriculture, and food, medicine, including sodium tripolyphosphate, calcium hydrogen phosphate and so on.

Phosphorus can improve the strength and hardness of stainless steel metal. Adding an appropriate amount of phosphorus in stainless steel metal can make its grain refinement, thus improving its strength and hardness. This is because the element phosphorus can form a solid solution at the grain boundaries, hindering the growth of grains, thus making the grains become finer improving the strength and hardness of stainless steel metal.

Phosphorus can improve the machinability of stainless steel metal. In the production process of stainless steel metal, the addition of an appropriate amount of phosphorus can improve its plasticity and malleability, making it easier to be machined into parts of various shapes and sizes. This is because the element phosphorus can promote the slip of grain boundaries and reduce the flow stress of the material, thus improving the plasticity and malleability of stainless steel metal.

Phosphorus can also improve the corrosion resistance of stainless steel metal. Adding an appropriate amount of phosphorus in stainless steel metal can form a stable phosphide film, preventing oxidation and corrosion of the stainless steel metal surface. This is because phosphorus can form a stable chromium phosphide compound with chromium, thus improving the corrosion resistance of stainless steel metal.

Phosphorus is an important element in stainless steel metal, it has an important impact on the performance of stainless steel metal in the production and application of stainless steel metal, according to the specific requirements and use of the environment, the need to reasonably control the content of phosphorus elements, in order to achieve the best performance and results