Stainless steel is more and more popular with people because of its beautiful appearance, corrosion resistance and not easy to damage. Pots and pans, city sculptures, buildings, decoration rooms and other places use stainless steel more and more, but people do not know much about stainless steel, some customers when buying stainless steel kitchenware, holding magnets to try go with. It is thought that the magnet attracts stainless iron, and it does not attract stainless steel. Its practical magnet attraction to judge good or bad is unscientific, indicating that there are still misunderstandings in people's understanding of stainless steel.
Iron and steel are usually distinguished by their carbon content. Iron-carbon alloys with carbon content below 2% are steel, and those with carbon content above 2% are called iron. Steel is widely used because of its toughness, elasticity and rigidity. All that comes into contact with life is steel, but people call it differently. For stainless steel, whether the magnet can be attracted or not, as long as it meets the quality standards, it is stainless steel. The main corrosion resistant element of stainless steel is chromium. Steels with chromium content above 10.5% will not rust. Different alloying elements are added during smelting, and there is a difference between magnets being able to attract and not being attracted. Stainless steel is generally divided according to the structure and can be divided into several categories such as austenite, ferrite, and martensite.
If different proportions of chromium and nickel are added to the molten steel, the austenitic steel that is refined is stainless steel that cannot be attracted by magnets; if chromium and a small amount of nickel (or nickel-free) is added to the molten steel, the refined steel is Ferrite stainless steel can be attracted by magnets; the main alloying elements of martensitic stainless steel are chromium, iron and carbon. There are more than 100 types of stainless steel due to different alloy contents, and the characteristics and functions are also different. Generally, austenitic stainless steel is used for decoration, landscape and sculpture. Because austenitic stainless steel has low thermal conductivity, it is not suitable to use it for kettles, woks, and rice cookers, which will waste energy and prolong the cooking time of boiling water.
Using ferritic stainless steel for wok and rice cooker, not only has excellent corrosion resistance, but also its thermal conductivity is nearly half higher than austenitic stainless steel. In the washing machine, such as the bucket, water heater, vegetable basin, etc., as long as the utensils in contact with water should use ferritic stainless steel. Some people complain that stainless steel tools are not fast because the wrong stainless steel is used. Austenitic stainless steel cannot be hardened and is not suitable for cutting tools and cutting tools. Martensitic stainless steel tools can change the hardness of stainless steel through heat treatment, such as quenching and tempering. "Stainless steel" is just a generic term. The standard name is "acid and alkali resistant steel". Stainless steel is a steel product made by adding chromium, nickel and other metal elements to ordinary steel. The content of metal elements such as nickel, molybdenum, and titanium The higher the quality, the better the stainless steel. The traditional identification method is to use a magnet. The smaller the magnetism, the better the quality. Chromium stainless steel that contains only chromium and no nickel is not attracted by magnets. It is used in industrial and chemical fields. General household appliances such as microwave ovens, rice cookers, electric water heaters, and electric thermos use chromium stainless steel, which can be attracted by magnets live. Except for austenitic stainless steels, all are magnetic.