Now that stainless steel
products can be seen everywhere, consumers do not carefully identify whether they are made of stainless steel when purchasing. But sometimes we will find that why does the stainless steel pot get rusted after a period of time? Rusted stainless steel pot is not only beautiful, but also has an impact on our health. Here we provide you with a concentrated identification of stainless steel Material method.
201 stainless steel plate
and 304 stainless steel plate
are stainless steel plates that are often used in daily life. There is no difference between the two from the outside, but their performance and price are quite different.
In terms of fatigue strength, 201 stainless steel plate has greater hardness and toughness than 304 stainless steel plate, and 304 stainless steel plate has better fatigue resistance.
If it is a stainless steel plate of the same size and thickness, the price of 304 stainless steel plate will be higher than that of 201, because 304 stainless steel plate is better than 201 stainless steel plate in terms of performance and quality.
Because of the high manganese content in 201 stainless steel, its surface is brighter, especially black. The disadvantage is that it is easy to rust. The content of chromium in 304 stainless steel is relatively high, and the surface appears magnesia, which is not easy to rust.
We all know that stainless steel is not easy to rust because there is a layer of chromium-rich oxide on the surface of the steel, which can protect the steel body. The content of chromium and nickel in 201 stainless steel is lower than that of 304 stainless steel, so in terms of rust resistance, 304 stainless steel is better than 201 stainless steel. If it is in the same outdoor environment, 304 stainless steel will not rust after three or four years of use, while 201 stainless steel will rust more easily.
How to identify stainless steel material
1. To identify stainless steel plates imported or ordered by steel mills, it is generally only necessary to check the marks on the steel or packaging according to the quality certificates of imports or steel mills. This is also a basic identification method.
2. The overstocked stainless steel material in the society depends on the length of the overstocked backlog time and the quality of storage. When purchasing stainless steel sheets or stainless steel products, you can also ask whether the product is an overstocked stainless steel material. If so, ask how long the backlog is, and make a choice according to the place to be used.
3. Remove the oxide layer on the steel, put a drop of water, and rub it with copper sulfate. If it does not change color after rubbing, it is generally stainless steel; if it turns purple, the non-magnetic one is high-manganese steel, and the magnetic one is generally ordinary steel. or low alloy steel.