stainless steel sheet 304 304l 316 409 410 904l，Types of thick stainless steel plates: According to the composition, it can be divided into Cr series (SUS400), Cr-Ni series (SUS300), Cr-Mn-Ni (SUS200). 201 202 430 420 410 410S 431 1.4362 2205 etc.
Chemical composition (%): Mo is added to SUS316F stainless steel, which has good corrosion resistance, atmospheric corrosion resistance and high temperature strength, and can be used under harsh conditions; excellent work hardening (non-magnetic). Many people think that stainless steel is rusty, but in fact, stainless steel has good corrosion resistance. The reason is that a passivation film is formed on the surface, which exists in the form of a more stable oxide in nature.
In addition to the corrosion resistance of oxidizing acid medium, this kind of steel can also resist the corrosion of sulfuric acid, phosphoric acid, formic acid, acetic acid, urea, etc. if it contains elements such as Mo and Cu. If the carbon content in this type of steel is less than 0.03% or contains Ti and Ni, its resistance to intergranular corrosion can be significantly improved. High silicon austenitic stainless steels have good corrosion resistance.
From a metallurgical point of view, there is no such thing as stainless steel. The main element of stainless steel corrosion resistance is chromium. Steel with a chromium content of more than 10.5% is not easy to rust. The alloying elements added during smelting are different, and there is a difference between the magnets that can attract and those that cannot. Stainless steel is generally divided according to the structure, which can be divided into several categories such as austenite, ferrite, and martensite. If different proportions of chromium and nickel are added to molten steel, the resulting austenitic steel is stainless steel that cannot be attracted by magnets; if chromium and a small amount of nickel (or no nickel) are added to molten steel, the resulting steel is a magnet The stainless steel that can be absorbed is also called ferritic stainless steel; the main alloying elements of martensitic stainless steel are chromium, iron and carbon. There are more than 100 kinds of stainless steel due to different alloy content. In addition to austenitic stainless steel magnets that cannot be attracted, ferritic and martensitic stainless steels are magnetic.
Nickel has very little reserves in the world and is relatively expensive. Therefore, stainless steel with high nickel content is also more expensive in the market, and the magnet is not attracted to it. In fact, there is also a stainless steel magnet that cannot be attracted. That is stainless steel with high manganese content and little nickel or nickel-free. The market price of this stainless steel is more than 1,000 yuan per ton lower than that of stainless steel with high nickel content. Some dealers just use people's misunderstanding that "good stainless steel magnets can't be attracted" to deceive consumers, and the price is as expensive as high nickel-containing stainless steel.