Main differences between GB standard rails and foreign standard rails
ⅠDifferences in materials and mechanical properties
1. National standard rails (such as GB/T 2585) usually use materials such as U71Mn and U75V, with a tensile strength of more than 880MPa, suitable or ordinary railways and heavy-load lines.
2.Foreign standard rails such as AREMA (American standard) usually use 1080/1100 grade high carbon steel, which has higher hardness and is suitable for heavy-load freight;
3. European standard EN 13674-1 focuses on high-speed railways and emphasizes fatigue performance.
4. Russian standard GOST R 51685 rails contain alloy elements such as Cr and Ni.
5. Russian standard has better low temperature resistance, and are suitable for cold regions.
ⅡDimensions and tolerance requirements
1. The cross-sectional dimensions of national standard rails (such as 60kg/m) are close to UIC standards, but some details (such as the radius of the rail head arc) are slightly different.
2. The height and bottom width of the American standard AREMA rails are slightly larger than those of the national standard.
3. American standard AREMA rails can accommodate a larger axle load (such as more than 36 tons).
4. The European standard EN rails have stricter tolerances on the thickness and symmetry of the rail waist.
5. The European standard EN rails can ensure the stability of high-speed trains.
Ⅲ Adaptability to high-cold/high-temperature environments
1. The Russian standard GOST rails have passed the -60℃ low-temperature impact test.
2. The Russian standard GOST rails are suitable for extremely cold areas such as Siberia.
3. The Middle East market prefers the European standard EN rails because of their stronger high-temperature oxidation resistance.
4. addition of elements such as V and Nb can make stronger high-temperature oxidation resistance.
5. The national standard U75V rails need to be combined with special heat treatment processes to prevent brittle fracture in areas with large temperature differences (such as the Qinghai-Tibet Railway).
Ⅳ Selection of UIC860V and EN standards
1. UIC860V is a common standard of the International Railway Union, emphasizing interchangeability.
2. UIC860V is suitable for countries such as Asia, Africa and Latin America that use European technology.
3. EN 13674-1 focuses more on high-speed railways (such as 300km/h+).
4. EN 13674-1 has higher requirements for rail straightness and residual stress.
5. Although China's high-speed rail adopts national standards, export projects often need to meet both UIC and EN standards to pass acceptance.
Ⅴ Common international certification requirements
1. The European market requires mandatory CE certification (EN standards + factory production control system).
2. North American projects require AREMA certification + third-party testing (such as ultrasonic flaw detection).
3. Southeast Asian countries may require ISO 9001 or IRIS (International Railway Industry Standard) qualifications.
4. Middle Eastern customers often require SABER certification (Saudi Arabia) or COC (Certificate of Conformity).
5. Some African countries still use the old version of BS (British Standard) or IRS (Indian Standard), so please pay attention to version compatibility.