U45Mn And U71Mn

The main differences between U45Mn and U71Mn rail materials are as follows:

1.Current status:

U45Mn: In the current standards for railway rail materials, U45Mn is considered an outdated choice and is no longer recommended as a mainstream choice.

U71Mn: It has become the main choice for modern railway heavy rail materials, especially in situations where high strength and durability are required.

2.Chemical composition:

U45Mn: The chemical composition restrictions of U45Mn are not specifically mentioned, but generally the chemical composition of this type of material may not be as accurately controlled as that of U71Mn.

U71Mn: Its chemical composition has clear restrictions, such as C content of 0.650.76%, Mn content between 1.101.40%, and sulfur and phosphorus content must be controlled below 0.030%. These restrictions ensure the purity and performance of the rails.

3.Mechanical properties:

U45Mn: The mechanical properties of U45Mn are not specifically mentioned, but generally speaking, they may not be as good as U71Mn.
U71Mn: The tensile strength is at least 880N/mm2, and the elongation after fracture also meets certain standards. These properties ensure the reliability and safety of the rails in use.

4.Applicable scenarios:

U45Mn: It is no longer recommended because it does not meet the needs of new standards and modern engineering.
U71Mn: It is suitable for heavy rail scenarios that require high strength and durability, and is the preferred material in modern railway construction.

In summary, U71Mn rail material is superior to U45Mn in terms of chemical composition, mechanical properties and applicable scenarios, so it has become the main choice for modern railway heavy rails.