As we all know, iron products are easy to rust, so most of the products are replaced by stainless steel products, because stainless steel has better corrosion resistance, but it is not that it will not rust, but it is not easy to rust.

But rusted railway tracks are often seen, do you know why railway tracks are not replaced with stainless steel?

In this article, let Baowu take you to understand the mystery.

First of all, let's briefly understand why stainless steel is not easy to rust. Stainless steel is also a kind of steel. Because steel has both toughness, elasticity and rigidity, as far as rusting is concerned, it is mainly not resistant to corrosion. The main element that determines the corrosion resistance of stainless steel is chromium. Steel with a chromium content of more than 10.5% will not rust, because the oxidation of chromium and the corrosive medium forms an oxide film on the surface, which can prevent further basic corrosion.

When the train is running on the rails, it will have a very large frictional force with the rails, and over time, these rust marks on the rails will disappear. And every once in a while, there will be regular staff to carry out a finishing and repair.

And the railway track is made of high-hardness, high-toughness steel, because manganese steel is hard and wear-resistant and has a certain impact toughness, which is in line with the conditions for manufacturing rails. The density of manganese rails is very high. When an oxide rust film is formed on the surface, it will form a protective effect on the inside and will not affect the use. Although stainless steel is not easy to rust, its strength is actually not as strong as that of steel rails. This is why railroad tracks are not replaced with stainless steel.

Iron and steel are distinguished by their carbon content. Iron-carbon alloys with a carbon content of less than 2% are steel, and those with a carbon content of more than 2% are called iron.

Therefore, the selected rail material seems to be simple, but in fact, it has been condensed for hundreds of years of people's exploration and consideration of rail, so the most suitable material has finally been obtained.

The above is the reason why the railway track is not replaced with stainless steel. If you want to know more, please pay attention to Baowu at any time.