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[201 stainless steel pipe] What is the difference between 201 stainless steel pipe and 202 stainless steel pipe?

by:HHGG     2021-04-29
[201 stainless steel pipe] What is the difference between 201 stainless steel pipe and 202 stainless steel pipe? 2019-09-05    On the official website of stainless steel pipe manufacturers, people often ask about the difference between 201 stainless steel pipe and 202 stainless steel pipe. Today, I will briefly analyze the difference between 201 stainless steel pipe and 202 stainless steel pipe based on the collected knowledge.   201 stainless steel pipe and 202 stainless steel pipe are actually more common stainless steel pipes in daily life, and they belong to the 200 series stainless steel. In the stainless steel industry, 201 represents a material. 201 stainless steel refers to the general term of 201 stainless steel and acid-resistant steel. 201 stainless steel refers to steel that is resistant to corrosion by weak media such as atmosphere, steam and water, while acid-resistant steel refers to steel that is resistant to chemical corrosion media such as acid, alkali, and salt. The national standard model is 1Cr17Mn6Ni5N. The element manganese (and nitrogen) of 201 stainless steel plate replaces part or all of the nickel, and it is possible to produce a lower nickel content that is not balanced and forms ferrite. Therefore, the content of ferrochrome in 200 series stainless steel drops to 15%-16%, or even 13%-14%, so its corrosion resistance cannot be compared with 304 and other similar steels. 201 stainless steel has certain acid and alkali resistance, high density, no bubbles, no pinholes, etc. It is used to produce various watch cases and watchband back cover materials. Mainly used to make decorative tubes, industrial tubes, and some shallow stretched products.   202 stainless steel is one of 200 series stainless steel, the national standard model is 1Cr18Mn8Ni5N. The 200 series stainless steel is a low-nickel high-manganese stainless steel with a nickel content and a manganese content of about 8%. It is a nickel-saving stainless steel. 202 is the American standard number, instead of 1Cr18Ni9. Austenitic stainless steel is characterized by a high phase transformation temperature, so it can be used as a heat-resistant steel. To make the austenitic stainless steel undergo phase transformation, it must be heated to above 1000°C. At 350°C, the metallographic structure will not change, that is, the properties of the steel will not change fundamentally. Expansion will only be caused by heating, but the change is not large and can be ignored under normal circumstances. For this reason, 202 stainless steel has good high temperature resistance. Because of its performance, 202 stainless steel is widely used in architectural decoration, municipal engineering, highway guardrails, hotel facilities, shopping malls, glass handrails, public facilities and other places. It is welded by high-precision automatic pipe-making equipment through self-corrosion welding, rolling and forming, without any metal filler, filled with gas protection (inside and outside of the pipe), welding method is TIG process, and online solid solution vortex flaw detection.   From the point of view of the grade, 202 is one more manganese and 3 more nickel than 201. In practical applications, 202 is slightly better than 201 in terms of utility, but most users in the market accept decorative tubes made of 201 that are cheaper and have practical utility similar to 202. 202 has slightly more chromium and manganese than 201, and its mechanical and corrosion resistance properties are slightly better. However, strictly speaking, the properties of these two stainless steels are not much different in nature, especially in corrosion resistance.   Price: If it really meets the national standard, the nickel content in 202 is higher than that of 201 stainless steel, so the price must be more expensive than 201 stainless steel. There will be many sellers in the market saying that our house is 202, which is cheaper than 201, so his 202 should be fake.   In addition, manganese is widespread in 201 and 202 materials, which can be harmful to human health when used as tableware materials. The state has explicitly prohibited it.   The above is the common sense of the difference between 201 stainless steel pipe and 202 stainless steel pipe compiled by the editor, I hope it can be helpful to everyone.  
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