Chemical Composition and Mechanical Properties of External Standard Rails
- What are the common standards for foreign - standard steel rails?
Common standards for foreign - standard steel rails include German standard DIN536, British standard BS113A, American standard ASTM, etc. German - standard DIN536 steel rails have high strength and high toughness. British - standard BS113A steel rails are widely used in some European countries, and American - standard ASTM steel rails are mainly used in the United States and some regions that follow American standards.
- What is the role of carbon element in foreign - standard steel rails?
The carbon element is an important component of foreign - standard steel rails, which can improve the strength and hardness of the steel rails. Appropriate increase of carbon content can enhance the wear - resistance and compression - resistance of the steel rails. However, too high carbon content will reduce the toughness and plasticity of the steel rails, and increase cold - brittleness, affecting the use performance of the steel rails in low - temperature and other environments.
- What aspects does the mechanical properties of foreign - standard steel rails include?
The mechanical properties of foreign - standard steel rails include tensile strength, yield strength, elongation and impact toughness, etc. Tensile strength determines the ability of the steel rail to resist tensile fracture, yield strength reflects the stress when the steel rail begins to produce obvious plastic deformation, elongation reflects the plasticity of the steel rail, and impact toughness indicates the ability of the steel rail to resist fracture under impact load.
- What are the models and characteristics of German - standard steel rail DIN536?
Common models of German - standard steel rail DIN536 include A45, A55, A65, etc. Type A45 is a heavy - duty steel rail with high strength and stiffness, suitable for heavy - haul railways and high - speed railways. Type A55 is a light - duty steel rail with small cross - sectional size and good fatigue - resistance, suitable for light - duty railways and urban rail transit. Type A65 is a medium - heavy steel rail, and its strength and stiffness are between the former two, suitable for medium - load railways and heavy - haul railways.
- How to select suitable railway lines according to the mechanical properties of foreign - standard steel rails?
For high - speed railways, steel rails with high tensile strength, high yield strength and good impact toughness should be selected, such as types A45 and A75 in German - standard DIN536, to bear the dynamic load of high - speed trains. Heavy - haul railways need to select steel rails with high strength and stiffness, and super - heavy steel rails such as type A100 can be selected. Light - duty railways or urban rail transit can select light - duty steel rails such as type A55, which can not only meet the requirements but also reduce costs.