Material reports for stainless steel materials, stainless steel properties and material tables

Stainless steel refers to a general term for steel that has certain chemical stability in atmosphere, water, acids, alkalis and salts, or other corrosive media. Generally, steel that is resistant to corrosion by weak media such as atmosphere, steam, and water is called stainless steel.

The good corrosion resistance of stainless steel is due to the addition of chromium to carbon-iron alloys. There are many types of materials, and you can check the relevant information for details.

304 (0Cr18Ni9) universal model; i.e. 18-8 stainless steel.

304L(00Cr18Ni11) Type 304L material has better structure and welding characteristics due to its low carbon content.

304H Features: Stainless heat-resistant steel, with good pipe bending, welding process performance, corrosion resistance, high lasting strength and structural stability, and very good cold deformation ability. The operating temperature can reach up to 650 °C, and the antioxidant temperature can reach up to 850 °C.

309—Better temperature resistance than 304.

310s (0cr25ni20 0cr25ni20si2), also known as 2520. and other special materials can be used for plain weave stainless steel dense mesh, twill woven stainless steel dense mesh, bamboo woven stainless steel dense mesh, contrast woven stainless steel dense mesh. Performance:

It has the characteristics of stable and fine filtration performance. Uses: used in aerospace, petroleum, chemical and other industries.

Chemical composition C, SI, MN, P, S, NI, CR

316 (0Cr17Ni12Mo2) is the second most widely used steel grade after 304, mainly used in the food industry and surgical equipment, adding molybdenum to obtain a special structure that resists corrosion. Because it has better resistance to chloride corrosion than 304, it is also used as "marine steel". SS316 is commonly used in nuclear fuel** installations.

18 grade 10 stainless steel is also generally suitable for this application class.

The maximum carbon content of 316L (00Cr17Ni14Mo2) stainless steel can be used in applications where annealing cannot be performed after welding and maximum corrosion resistance is required. The corrosion resistance is better than that of 304 stainless steel, and it has good corrosion resistance in the production process of pulp and paper. It is also resistant to the erosion of the ocean and the aggressive industrial atmosphere.

317L Features --317L steel grade has better seawater resistance and SCC resistance than 316L Usages --Used in chemical equipment that requires high corrosion resistance, such as chemical ships, chemical product reactors, etc.

321—Except that the addition of titanium reduces the risk of corrosion in the weld of the material, other properties are similar to 304.

321H (0Cr18Ni10Ti) super corrosion-resistant, temperature-resistant stainless steel, while reducing carbon content, according to the technical strength of the addition of N (nitrogen), the use and characteristics of the same as 321, better intergranular corrosion resistance.

347 347H(1Cr19Ni11NB) Features:1It has good intergranular corrosion resistance and oxidation resistance.

2.It has good performance in pipe bending and welding process. 3.

The maximum operating temperature can reach 650 °C, and for anti-oxidation parts, the maximum anti-oxidation service temperature can reach 850°C. Uses: Mainly used in subcritical and supercritical pressure parameters of large-scale power generation boilers, power station boilers of high-temperature superheaters, high-temperature recrystallizers, high-temperature sections of screen superheaters, and various high-temperature and high-pressure resistant pipe fittings and other components.

Stainless steel is more and more loved by people because of its beautiful appearance, corrosion-resistant characteristics, and the advantages of not being easy to damage. More and more stainless steel is used in pots and pans, urban sculptures, buildings, and decoration rooms. The other day, I saw a customer sucking around on stainless steel utensils with a magnet while buying stainless steel kitchenware.

I asked him why he was using a magnet to suction. He said that what the magnet attracts is stainless iron, and what can't be attracted is stainless steel, and good stainless steel is not magnetic. It seems that people's understanding of stainless steel is still misunderstood.

Iron and steel are distinguished by the amount of carbon they contain. Iron-carbon alloys with a carbon content of less than 2% are called steel, and those with a carbon content of more than 2% are called iron. Steel is widely used because it has both toughness, elasticity and rigidity.

All we come into contact with in our lives is steel, but people call it differently. For stainless steel, it doesn't matter whether the magnet can be attracted or not, as long as it meets its quality standards, it is stainless steel. Therefore, from the point of view of metallurgy, there is no such thing as stainless iron at all.

The main element of stainless steel that resists corrosion is chromium. Steel with a chromium content above is less prone to rust. The alloying elements added during smelting are different, and there is a difference between magnets that can be attracted and those that cannot be absorbed.

Stainless steel is generally divided according to the organizational structure, which can be divided into several categories such as austenite, ferrite, and martensitic. If different proportions of chromium and nickel are added to the molten steel, the smelted 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 the molten steel, the steel is stainless steel that can be attracted by magnets, also called ferritic stainless steel; The main alloying elements of martensitic stainless steels 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 is very small in the world and is relatively expensive. Therefore, stainless steel with high nickel content is also higher in the market, and the magnet is not yet able to attract it. In fact, there is another kind of stainless steel magnet that cannot be sucked.

That is, stainless steel with high manganese content, low nickel content or no nickel. This stainless steel market is more than 1,000 yuan per ton lower than stainless steel with high nickel content. Some dealers just take advantage of people's misunderstanding that "good stainless steel magnets can't be sucked" to deceive consumers, ** as expensive as high nickel stainless steel.

There are more than 100 types of stainless steel, and the characteristics and functions are also different. Generally, austenitic stainless steel is used for decoration, landscape and sculpture. Because of the low thermal conductivity of austenitic stainless steel, it is not suitable to be used as kettles, woks, and rice cookers, which will use a lot of more energy and prolong the cooking time of boiling water.

Using ferritic stainless steel to make woks and rice cookers not only has excellent corrosion resistance, but also its thermal conductivity is nearly half higher than that of austenitic stainless steel. Washing machine barrels, water heaters, vegetable basins, etc., as long as the utensils in contact with water should be made of ferritic stainless steel. Some people complain that stainless steel knives are not fast, and this is because the wrong stainless steel is chosen.

Austenitic stainless steel cannot be hardened and is not suitable for knives and cutting tools. Tools made of martensitic stainless steel can change the hardness of stainless steel by heat treatment, such as quenching and tempering.

Stainless acid-resistant steel is referred to as stainless steel, which is composed of two parts: stainless steel and acid-resistant steel, in short, the steel that can resist atmospheric corrosion is called stainless steel, and the steel that can resist the corrosion of chemical media is called acid-resistant Qipeng steel. Generally speaking, steel with a WCR content greater than 12% has the characteristics of stainless steel Stainless steel can be divided into five categories according to the microstructure after heat treatment: ferritic stainless steel, martensitic stainless steel, austenitic stainless steel, austenitic-ferritic stainless steel and precipitation carbonization stainless steel.

Due to the excellent corrosion resistance, formability, compatibility, high yield and strength and toughness in a wide range of temperatures, stainless steel has been widely used in heavy industry, light industry, daily necessities industry and building decoration and other industries.

In layman's terms, stainless steel is steel that is not easy to rust, but in fact, some stainless steel has both stainless steel and acid resistance (corrosion resistance). The stainless steel and corrosion resistance of stainless steel is due to the formation of a chromium-rich oxide film (passivation film) on its surface. This rust and corrosion resistance are relative.

The test shows that the corrosion resistance of steel in weak media such as atmosphere and water and oxidizing media such as nitric acid increases with the increase of chromium content in steel, and when the chromium content reaches a certain percentage, the corrosion resistance of steel undergoes a sudden change, that is, from easy rust to not easy to rust, from non-corrosion resistance to corrosion resistance.

Stainless steel material, with a brightness close to the mirror, the touch is hard and the orange ice vertical chain is cold, which is a relatively avant-garde decorative material, which is in line with the cool aesthetics of the metal era.