Nowadays, airplanes and high-speed trains are prevalent, most ordinary people still choose ordinary trains, in the end, it is still a good price, everyone can afford to sit, and most people have a special bond with ordinary trains, which is difficult to outlaw. It is well known that ordinary trains run on train tracks and have their own distinctive routes. But when we ride the train, we see from time to time that most of the train tracks are rusted, and the initial shiny appearance is covered with a layer of rust stains, looking dirty.
Next some people will ask: why most of the domestic train tracks are rusted? Why can't we choose stainless steel material to build the track? In fact, the reason is very simple
From the technical side: people usually think that stainless steel material is not rust, in fact, stainless steel material will rust, only stainless steel rust after the surface rust stains (oxide film) is the appearance of stainless steel material color. Not quite understand? Simply put, the color of stainless steel after rusting is similar to the color before rusting. And there are many kinds of stainless steel materials, such as austenitic stainless steel (300 series) has better corrosion resistance and high strength, hardness, but are far from high manganese steel. Domestic train tracks with high manganese steel, and the usual steel is not the same, it contains a higher content of carbon and manganese two elements, than stainless steel materials are also resistant to wear. So that the performance of stainless steel materials are not suitable for all places to use.
In terms of resources: nickel and chromium used in stainless steel materials are relatively scarce, especially nickel is relatively scarce in the country. So that we are used to put valuable and good things always to be used in critical places, not to waste resources at will.
In terms of cost: we all know that the laying of train tracks need to spend manpower, material and financial resources. But the price of stainless steel materials than ordinary steel, aluminum, magnesium and aluminum alloy, plastic and other materials prices are not just a little higher, but the difference of several times. If the country's track to replace the stainless steel material, the cost of this cost is undoubtedly sky-high. So as long as the inexpensive materials can meet the needs, who will use expensive materials?
In a word, stainless steel material will not rust but not applicable to train tracks. The people who build the railroad track fully integrated analysis of function, performance, working environment, cost and possibility and other important factors, after many comparisons and weighing the pros and cons, before choosing this high manganese steel material.