What is stainless steel material？

 Generally speaking, stainless steel is not easy to rust steel, in fact a part of stainless steel, both rust, and acid resistance (corrosion resistance). The stainability and corrosion resistance of stainless steel are due to the formation of chrome-rich oxide film (passivation film) on its surface. This rust resistance and corrosion resistance are relative. The test SHOWS THAT THE CORROSION RESISTANCE OF STEEL in the atmosphere, water and other weak media and nitric acid and other oxidizing media, its corrosion resistance increases with the increase of chromium content in steel, when the chromium content reaches a certain percentage, the corrosion resistance of steel changes, namely from easy to rust to not easy to rust, from corrosion resistance to corrosion resistance.

stainless steel pipe

Stainless steel material: stainless steel belt, stainless steel rod, stainless steel plate, stainless steel line, stainless steel pipe, product brand :SUS310S, 309S, 316L, 316, 316Si, 317, 304, 304L, 309, 305, 31403, 321, 301, 202, 201, etc.; Stainless steel provides satisfactory corrosion resistance for a wide range of industrial applications. According to the use of experience, in addition to mechanical failure, corrosion of stainless steel is mainly shown in: a serious form of corrosion of stainless steel is local corrosion (i.e. stress corrosion cracking, pitting corrosion, intergranular corrosion, corrosion fatigue and crevice corrosion). The failure cases caused by local corrosion accounted for almost half of the failure cases. In fact, many failure accidents can be avoided by reasonable material selection.

Stainless steel with its beautiful appearance, corrosion resistance, not easy to damage the advantages, more and more people love. POTS AND pans, city sculpture, building, decorate a bedroom to use stainless steel more and more. The other day, I saw a customer with a magnet on stainless steel utensils when he was buying stainless steel kitchenware. I asked him why he was using magnets. He said that the magnet on the stainless iron, not on the stainless steel, stainless steel is not magnetic. It seems that people's understanding of stainless steel and misunderstanding.

Iron and steel are distinguished by the amount of carbon they contain. An iron-carbon alloy with a carbon content of less than 2% is steel, and an iron-carbon alloy with a carbon content of 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, regardless of magnet on or not, as long as in line with its quality standards, are stainless steel. Therefore, from the point of view of metallurgy, there is no such thing as stainless iron. The main anti-corrosion element of stainless steel is chromium. Steel with a chromium content of more than 10.5% will not rust easily. When smelting, the alloy element added is different, and there is a magnet suction and not on the difference. Stainless steel is generally divided according to the structure of the organization, can be divided into austenite, ferrite, martensite and other categories. If you add different proportions of chromium nickel to the molten steel, the austenitic steel is not magnet on the stainless steel; If added to the molten steel chromium and a small amount of nickel (or do not add nickel), the steel is magnet on the stainless steel, also known as 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 because of the different amount of alloy. In addition to austenitic stainless steel magnet not on, ferrite, martensitic stainless steel are magnetic.

Nickel is a rare element in the world and the price is relatively expensive. Therefore, the price of stainless steel with high nickel content is also higher on the market, and the magnet is not attracted. In fact, there is a stainless steel magnet is not on. That's stainless steel with high manganese and low nickel or no nickel. The market price of this stainless steel is more than 1000 yuan per ton lower than the stainless steel with high nickel content. Some dealers are using people "good stainless steel magnets are not on" misunderstanding, cheat consumers, the price is as expensive as high nickel stainless steel.

There are more than 100 kinds of stainless steel, characteristics 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, wok, rice cooker, will use a lot of energy, but also extend the cooking time. Using ferritic stainless steel for frying pan, rice cooker, not only has excellent corrosion resistance, and its thermal conductivity than austenitic stainless steel nearly half. The bucket inside washing machine, water heater, dish basin, should choose ferritic stainless steel as long as the vessel that contacts with water. Some people complain that 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.