Steel rail is the main component of the railway track, directly bear repetition and impact loads of rolling stock wheels. Therefore, rail steel requires adequate hardness, tensile strength, fatigue strength and toughness. As no expansion joints rapid development of the railway line, it should also have certain weld ability. In 1767, iron rail appeared, when the materials used for the malleable are irons. In 1830, British C.Vignoles and American R.L.Stevens designed the inverted T-shaped cross section of the rail, and in 1857 rolled success in the UK. In 1865 United States Bessemer rail rolling out. Currently the world's annual output of the steel rail is about 10 million tons, and the most productive countries are Soviet Union, the United States and China.
Note: Different types of steel rail
* Steel Rail’s type is roughly quality kg per one meter.
* At present, China's railway rail type mainly has 75 kg/m, 60 kg/m, 50 kg/m and 43 kg/m,38kg/m,24kg/m,. rail length has 6m, 6.5m, 9m, 9.5m, 10m, 10.5m, 12m, 12.5m and 25m;
* Light rail specifications from 4kg to 30kg, materials are 55Q / Q235;
* Heavy rail specifications from 38kg to 60kg, materials are U71Mn / 50Mn, etc;
* Crane rail specifications QU70, QU80, QU100, QU120, material U71Mn / 75V.
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