Difference between grade 304 and grade 202 stainless steel
1. Different specifications
Commonly used stainless steel plate is divided into 201 and 304 stainless steel plate two models, the actual composition is different,304 quality is better, but the price is expensive,201 is worse. 304 is imported stainless steel plate,201 is domestic stainless steel plate.
2. Different composition
201 is composed of 17Cr-4.5Ni-6Mn-N, which is a substitute steel for 301 steel. Magnetic after cold working, used in railway vehicles.
304 is composed of 18Cr-9Ni, which is the most widely used stainless steel and heat-resistant steel. Used in food production equipment, Xitong chemical equipment, nuclear energy, etc. Molybdenum also promotes the precipitation of intermetallic phases in austenitic stainless steel, such as σ-phase, κ-phase, and Laves equal, which adversely affects the corrosion resistance and mechanical properties of steel, especially resulting in a decrease in plasticity and toughness. In order to maintain a single austenitic structure of austenitic stainless steel, with the increase of molybdenum content in steel, the content of austenitic forming elements (nickel, nitrogen and manganese, etc.) should also be increased accordingly to maintain the balance between ferrite and austenitic forming elements in steel.
3. Different elements
201 is a high manganese content, the surface is very bright with dark bright, high manganese content is easy to rust.
304 contains more chromium, the surface is matte, no rust. Put the two together and there's a comparison. The most important thing is that the corrosion resistance is different, the corrosion resistance of 201 is very poor, so the price will be much cheaper. And because 201 contains low nickel, so the corrosion resistance is not as good as 304.
The difference between
4.201 and 304 is the nickel content
And the price of 304 is now more expensive, generally close to 50,000 tons, but 304 can at least ensure that it will not rust during use. (Experiment with potions)
5 Stainless steel is not easy to rust because the formation of chromium-rich oxide on the surface of the steel body can protect the steel body,201 material belongs to high manganese stainless steel than 304 hardness, high carbon and low nickel. Inherent intergranular corrosion This material, which does not contain titanium and niobium, has a tendency to intergranular corrosion. The intergranular corrosion can be reduced by adding titanium and niobium and then stabilizing them. In the air or chemical corrosive medium can resist corrosion of a kind of high alloy steel, stainless steel is a beautiful surface and good corrosion resistance, do not have to go through plating and other surface treatment, and play the inherent surface properties of stainless steel, used in many aspects of steel, usually called stainless steel.
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