Heat Treated Rails And Hot Rolled Steel Rails

Heat treated steel rails are made by heating ordinary calm steel rails. The heating temperature is around 920 ℃, and the holding time is 4-5 hours. Then, through cooling treatment, a layer of hard and wear-resistant coating is formed on the surface of the steel rail, thereby improving its service life and performance.

Hot rolled steel rails refer to steel rails that are rolled at high temperatures. Preheat the steel billet to around 1100 ℃, then undergo precision rolling and cooling treatment. This production method makes hot-rolled steel rails have high mechanical strength and plasticity, but their hardness and wear resistance are inferior to heat-treated steel rails.

The physical properties of heat-treated steel rails are mainly reflected in hardness and wear resistance. After heating treatment, the surface hardness of heat-treated steel rails can reach HB320-380, which is more than twice that of ordinary steel rails. At the same time, after heating treatment, the wear resistance of heat-treated rails has also been greatly improved, and the service life can reach 3-5 times that of ordinary rails.

The physical properties of hot-rolled steel rails are mainly reflected in mechanical properties and plasticity. The tensile strength, yield strength, and elongation of hot-rolled steel rails are much higher than those of ordinary steel rails, and their durability and service life have also been improved.

Due to the high hardness and wear resistance of heat-treated rails, they are suitable for use in high-speed and heavy-duty railways. At the same time, the surface of heat-treated steel rails is also relatively smooth, which can reduce the running noise of trains and improve the safety operation index of trains.

Hot rolled steel rails are suitable for general railway lines due to their high mechanical strength and plasticity. Due to its low cost, hot-rolled steel rails have been widely used in many places.

Heat treated rails and hot-rolled rails differ in production processes, physical properties, and application scenarios. Heat treated rails are suitable for high-speed and heavy-duty railways, while hot-rolled rails are suitable for general railway lines. In railway construction and maintenance, different rail materials should be selected reasonably according to actual needs.