Effect of manganese and phosphorus on properties of seamless steel pipe
One of the key factors in the performance of seamless steel pipes is the content of manganese and phosphorus in seamless steel pipes. Manganese is a good deoxidizer and desulphurizer, which can significantly improve the strength and hardness of steel in the process of steelmaking, and eliminate the influence of sulfur and oxygen on the thermal brittleness of steel, without reducing the plasticity and toughness of steel.
In particular, steel containing more than 0.70% manganese, known as "manganese steel", its toughness and strength are better than the general manganese content of steel, with higher quenching and hot working properties. In addition, steel containing 11-14% manganese also has a high wear resistance, suitable for excavator buckets, ball mill liners and other fields. However, it should be noted that high manganese content will reduce the corrosion resistance and welding performance of steel.
On the other hand, phosphorus is a common harmful element in seamless steel pipes, and its addition will increase the cold brittleness of steel, reduce plasticity and cold bending properties, and also have a negative impact on welding performance. Therefore, under normal circumstances, the phosphorus content in steel should be controlled below 0.045% as far as possible, and the requirements for high-quality steel are lower. In summary, stable control of manganese and phosphorus content in seamless steel pipes is an important measure to ensure the performance of steel pipes. Return to Sohu for more information.
