What is the difference between stainless steel and stainless iron
Published:2022-11-08 Views:68
1. First, stainless steel is a kind of stainless steel
The models are 409 410 430 444, which belongs to martensitic and ferritic stainless steel. The magnet will be magnetic. The stainless steel we often say is 303, 304, which belongs to austenitic stainless steel. The models are 201 202 304 321 316L, etc.
Stainless steel is a metal mainly composed of nickel and chromium, and its flexibility should not be easy to rust!
Stainless iron is a metal mainly composed of chromium and iron, with high hardness! Corrosive! The use area is not as wide as stainless steel!
Generally speaking, the rust prevention ability of stainless steel is not as good as that of stainless steel, but the hardness of stainless steel is greater than that of stainless steel.
Taking our automatic lathe parts as an example, we generally use 303 stainless steel for turning by default, because 303 is relatively easy to turn, and sometimes customers require 304 material. But you should know that 304 material is difficult to turn, while 303 is much better. In addition, 201201 material is cheaper than 303, but it is also difficult to process. There is also 316L, which has good corrosion resistance in the 300 series. Many products are used in sea water or ships, but this material is divided into national standard materials and imported materials. The national standard materials are difficult to process for automatic lathes, and imported materials are much better, but the price of imported materials is twice that of national standard materials, so you must pay attention when quoting!
2. Difference between stainless steel and stainless iron
Compared with stainless steel, stainless iron mainly depends on whether it contains nickel! Stainless iron generally refers to SUS430 in Japan and 1Cr17 in China. Its main chemical composition is: C:<0.12, Si:<0.75, Mn<100, P:<0.035, S<0.030, Ni:<0.60, Cr: 16.00-18.00, which is ferritic stainless steel.
Stainless iron contains chromium but no nickel. It is generally believed that stainless steel with ferromagnetism mainly refers to 1Cr17 (ferrite) series and 1Cr13 (martensite) series. However, Fe does not have ferromagnetism when it exists in the form of austenite. Ni/Cr is easy to be misunderstood, although they lead to the isomerism of Fe. However, Fe and Ni are ferromagnetic and Cr are paramagnetic. Many 1J series of high-performance soft magnetic materials are Ni based.
Stainless steel contains both chromium and nickel. Since nickel is a relatively stable element, its corrosion resistance is naturally much stronger than that of stainless iron! Due to the high price of nickel, the cost of stainless steel is higher than that of stainless iron. In addition to the difference in corrosion resistance, the price of stainless steel is 1/4~1/3 higher than that of stainless iron (for reference only)
Discrimination: Since nickel is a diamagnetic element, a relatively simple way to distinguish it is to see whether it has strong magnetism, that is, to attract it with a magnet!
In China, 201 is not the international standard, while 430 is basically the same as SUS430. In actual use, 430 is better than 201 in corrosion resistance.
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