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How To Distinguish Between Commonly Used Stainless Steel Plates 304 and 201?

Sep. 29, 2020


There are three main factors affecting Stainless Steel Corrosion:


1. the content of alloying elements, generally speaking, the content of chromium in 10.5% steel will not rust easily. The higher the content of chromium and nickel, the better the corrosion resistance. For example, the content of nickel in 304 material is 8-10%, and the content of chromium reaches 18-20%. Such stainless steel will not rust under normal circumstances.


2.The smelting process of the manufacturer will also affect the corrosion resistance of Stainless Steel. A large stainless steel plant with good smelting technology, advanced equipment and advanced technology can guarantee the control of alloying elements, the removal of impurities, and the control of the cooling temperature of the billet, so the product quality is stable and reliable, the internal quality is good, and it is not easy to rust. On the contrary, some small steel mills have backward equipment and technology. During the smelting process, impurities cannot be removed, and the products produced will inevitably rust.


3.the external environment, a dry and ventilated environment is not easy to rust. However, the air humidity is high, continuous rainy weather, or the environment with high pH in the air is easy to rust. 304 stainless steel, if the surrounding environment is too bad, it will rust.


304 Stainless Steel

304 Stainless Steel


Stainless steel 201 304 difference


1. Specifications: The commonly used stainless steel plates are divided into two types: 201 stainless steel and 304 Stainless Steel. In fact, they are different in composition. 304 has better quality, but the price is more expensive than 201. 304 is imported stainless steel plate, and 201 is domestic stainless steel plate.


2. 201 is an alternative steel to 301 steel. After cold processing, it has magnetism and is used in railway vehicles.


3. 304 is the most widely used stainless steel and heat-resistant steel. Used in food production equipment, general chemical equipment, nuclear energy, etc.


4. 201 has high manganese content, the surface is very bright with dark and bright, high manganese content is easy to rust. 304 contains more chromium, the surface is matte, does not rust, and the two are compared together. The most important thing is that the corrosion resistance is different. The corrosion resistance of 201 is very poor, so the price is much cheaper. And because 201 contains low nickel, the price is lower than that of 304, so the corrosion resistance is not as good as 304.


5. The difference between 201 and 304 is the nickel content. And the price of 304 is more expensive now, generally close to 50,000 a ton, but 304 can at least guarantee that it will not rust during use.


6. Stainless steel is not easy to rust because the chromium-rich oxide formed on the surface of the steel body can protect the steel body. Material 201 is high manganese stainless steel, which is harder than 304, high carbon and low nickel.


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