The GB standard steel rail is divided into high-quality carbon rails, alloy rails and full field heat treatment rails according to the materials selected.
1. High-quality carbon rail mainly has carbon and manganese elements to improve strength and improve toughness. Sulfur and phosphorus content are controlled below 0.030%, and the main grades are U74 and U71Mn.
2. The alloy rail is based on the carbon rail, adding appropriate alloying elements such as V, Ti, Cr, Mo, etc. to improve the strength and toughness of the rail. The alloy rails in China are RE-Nb rails, RE-Cr rails and V-Ti rail, the main brands are U76RENB, U75V, U76CrRE.
3. The full-length heat-treated rail is mainly the heat treatment process of the above two rails for heating and controlling cooling of the plain rail, improving the internal structure, refining the crystal grains, and forming the pearlite structure, thereby obtaining high strength and high toughness of the rail.