What types of stainless steel have magnetism?

 　　Not all stainless steel is the same. The following are the main series features that distinguish the types of stainless steel:

　　austenitic stainless steel

　　This is the most widely used stainless steel series. Due to the presence of more austenite, most austenitic stainless steels are non magnetic. Although stainless steel grades such as 304 and 316 stainless steel contain a significant amount of iron in their chemical composition, austenite makes them non ferromagnetic.

　　Some austenitic stainless steel alloys in this branch can be partially magnetized by special heat treatment or work hardening, because this process will change the crystal structure of the bottom layer and form ferrite at some positions.

　　Ferritic stainless steel

　　The most cost-effective stainless steel series. Ferritic stainless steel has magnetism due to the large amount of ferrite composition in the alloy.

　　Ferrites are compounds of iron and other elements. The combination of ferrite crystal structure and iron makes ferrite stainless steel (such as the 400 series) magnetic.

　　However, some variants of this ferritic stainless steel exhibit weak magnetic pull.

　　Duplex stainless steel

　　One of the latest stainless steel alloys, due to its absence of nickel (an element used to make grades non magnetic), provides a good balance between higher corrosion resistance, ease of manufacturing, and cost savings.

　　The mixture of austenite and ferrite crystals in duplex stainless steel contributes to their magnetic pull; A large amount of ferrite (magnetism) is also important. The most famous dual phase steel grade on the market is 2205.

　　Precipitation hardened and martensite stainless steels

　　Used for hardening edge (cutting) applications. After hardening, the material exhibits magnetism.

　　On the contrary, many martensite stainless steels are inherently magnetic. This includes common grades such as 410, 420, and 440. If iron is present, the unique crystal structure of martensite stainless steel can be ferromagnetic. As stainless steel is a kind of steel, its composition contains a large amount of iron, which is the main reason why martensite stainless steel has magnetism.



评论

发表评论

此博客中的热门博文

National Standard Properties of 304 Stainless Steel Plate

图片
　　 304 stainless steel plate tensile strength (Mpa) 520 　　Yield strength of 304 stainless steel plate (Mpa) 205-210 　　Elongation rate of 304 stainless steel plate (%) 40% 　　304 stainless steel plate hardness HB187 HRB90 HV200 　　The density of 304 stainless steel is 7.93 g/cm3. Austenitic stainless steel generally uses this value. The chromium content (%) of 304 is 17.00 to 19.00, and the nickel content (%) is 8.00 to 10.00304, which is equivalent to 0Cr19Ni9 (0Cr18Ni9) stainless steel in China 　　304 stainless steel is a versatile stainless steel material with stronger rust resistance than the 200 series stainless steel material. It also has good resistance to high temperatures. 　　304 stainless steel has excellent rust resistance and good intergranular corrosion resistance. 　　For oxidizing acids, it was found in experiments that 304 stainless steel has strong corrosion resistance in nitric acid below boiling temperature with a concentration of ≤ 65%. It also has good cor
阅读全文

Advantages of extruded aluminum

图片
 　　 Extruded aluminum has many advantages compared to other metals. Some metals can match some of the ideal properties of aluminum, but no metal can match all of these advantages simultaneously. 　　There are many benefits of aluminum profiles, including: 　　Light. The weight of aluminum is about one-third of the weight of iron, steel, copper, or brass. This makes it easier to handle and transportation more economical. Therefore, aluminum is widely used in automotive design, aerospace, and high-rise buildings. 　　Strong. The strength of aluminum is sufficient to meet all applications except for the most demanding ones. Aluminum is very suitable for cold environments as it becomes stronger as the temperature decreases. 　　Corrosion resistance. Aluminum does not rust. It is protected by oxide surface facial mask, and this protection can be enhanced by anodic oxidation. 　　Excellent thermal conductivity. Aluminum has better thermal conductivity than most metals. This makes it an
阅读全文