Strong magnet can suck stainless steel?

Stainless steel with its beautiful appearance, corrosion resistance characteristics, not easy to damage the advantages, more and more people's favorite. There are more and more places using stainless steel, such as pots and pans, urban sculpture, architecture, decoration of living rooms, etc., but people do not know much about the discrimination of stainless steel. Some customers try on stainless steel utensils with magnets when buying stainless steel kitchenware. It is believed that the magnet is attracted by stainless steel, and the magnet is not attracted by stainless steel. In fact, it is unscientific to judge good or bad by magnet attraction, which shows that people still have misunderstandings about stainless steel.

Iron and steel are usually distinguished by the amount of carbon. Carbon content inBelow 2% of the iron carbon alloy is steel, carbon content in more than 2% is called iron. Steel is widely used because of its toughness, elasticity and rigidity. Life is exposed to steel, but people call it different. For stainless steel, whether the magnet is attracted or not, as long as it meets the quality standards, it is stainless steel. The main element of corrosion resistance of stainless steel is chromium. Steel with a chromium content of more than 10.5 percent does not rust. The alloy elements added during smelting are different, and there is a difference between the magnet and the magnet. Stainless steel is generally divided according to the organizational structure, can be divided into austenite, ferrite, martensite and other categories.

If different proportions of chromium and nickel are added to the molten steel, the austenitic steel is stainless steel that the magnet cannot attract. If chromium and a small amount of nickel (or no nickel) are added to the molten steel, the steel is ferritic stainless steel that the magnet can attract. The main alloying elements of martensitic stainless steel are chromium, iron and carbon. Stainless steel has different alloy content.100 a variety of features and functions are not the same. Generally do decoration, landscape, sculpture selection of austenitic stainless steel. Because of the low thermal conductivity of austenitic stainless steel, it is not appropriate to use it as a kettle, frying pan and rice cooker, which will waste energy and prolong the time of boiling water for cooking.

Using ferritic stainless steel to make frying pans and rice cookers not only has excellent corrosion resistance, but also has nearly half of its thermal conductivity than austenitic stainless steel. Washing machine inner barrel, water heater, washing basin, etc., as long as the utensils in contact with water should be selected ferritic stainless steel. Some people complain about the stainless steel tool is not fast, this is because the wrong choice of stainless steel. Austenitic stainless steel can not be hardened, not suitable for cutting tools, cutting tools. The tool made of martensitic stainless steel can change the hardness of stainless steel by heat treatment, such as quenching and tempering."Stainless steel" is just a general term. The standard name is "acid-resistant and alkali-resistant steel". Stainless steel is a steel product made by adding chromium, nickel and other metal elements on the basis of ordinary steel. The higher the content of metal elements such as nickel, molybdenum and titanium, the better the quality of stainless steel. The traditional identification method is to use a magnet to attract, the smaller the magnetic, the better the quality. Only chromium and nickel-free is chromium stainless steel. Chromium-nickel stainless steel is not attracted by magnets and is used in industrial and chemical fields. General household appliances such as microwave ovens, rice cookers, electric water heaters, and electric thermos are all made of chromium stainless steel. In addition to austenitic stainless steel are magnetic.

Principle of magnet attraction

Determined by the characteristics of the magnet, if interpreted in terms of atomic current, it is the magnetic field generated by the current magnetizing other objects magnetizing objects to generate electric fields and the interaction of electric fields to generate forces. Substances are mostly made up of molecules, molecules are made up of atoms, and atoms are made up of nuclei and electrons. Inside the atom, electrons spin and revolve around the nucleus. Both of these movements of electrons produce magnetism. But in most substances, the direction of electron motion is different and chaotic, and the magnetic effects cancel each other out. Therefore, most substances do not exhibit magnetism under normal circumstances. Ferromagnetic substances such as iron, cobalt, nickel or ferrite are different. The electron spins inside it can be arranged spontaneously in a small range to form a spontaneous magnetization region. This spontaneous magnetization region is called magnetic domain. After the ferromagnetic substance is magnetized, the internal magnetic domains are neatly arranged in the same direction to strengthen the magnetism and form a magnet. The iron absorption process of the magnet is the magnetization process of the iron block. The magnetized iron block and the magnet generate attractive force between different polarities, and the iron block is firmly connected to the magnet."Stick" together. Let's just say magnets are magnetic.

Whether a magnet can attract something is related to the magnetic permeability of the attracted thing, and the magnetic permeability is related to the magnetic domain. Among various elements in nature, nickel has the highest magnetic permeability, then cobalt, and iron again. Other substances such as copper also have certain magnetic permeability, but it is very low, so that we cannot feel it. Not iron-containing things can be attracted by magnets, stainless steel is an alloy, that is, chromium and nickel are added on the basis of iron.1Cr13 is added with Cr,310 stainless steel is Cr25Ni20Si2 added with Cr, Ni and Si,304 stainless steel is added with Cr, Ni and Ti, etc. As a result, the original magnetic domain arrangement is changed, the magnetic permeability is reduced, and even our hands cannot feel it, so we do not feel it. According to the same principle, we can also make alloys with very high permeability.

People often use magnets to adsorb stainless steel to verify its merits. Do not suck non-magnetic, considered to be good, on the contrary, is considered to be a fake. In fact, this is an unrealistic method of identification. Generally, people who have been engaged in stainless steel materials for more than ten years know that relying on the traditional method of judging stainless steel by magnetism is likely to suffer. According to their introduction, there are many kinds of stainless steel, which can be divided into austenite type and martensite or ferrite type according to the structure at room temperature. Austenite type is non-magnetic or weak magnetic, martensite or ferrite type is magnetic. However, this is not necessarily the case. Such as usually used as a decoration tube plate, austenitic type.304 materials are generally non-magnetic, but magnetic properties may also occur due to fluctuations in chemical composition or different processing states caused by smelting, which cannot be considered counterfeit or unqualified. In addition, 304 stainless steel after cold working, the structure will also be transformed into Martensite, the greater the degree of cold working deformation, the more martensite transformation, the greater the magnetic properties of the steel. On the contrary, the quality of the 200 series stainless steel, it is likely not magnetic, thus determining that it is genuine stainless steel, it is a big mistake.