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What is the difference between 201 and 202 stainless steel


201 and 202 stainless steel are two very common stainless steel materials, both belongs to 200 series stainless steel, so what are the specific differences between these two materials? In addition to the different material labels caused by different ingredient contents, what are the actual differences in specific applications and characteristics?

In the stainless steel industry, 201 represents a material. 201 stainless steel refers to the general term for 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 corrosion by chemically corrosive media such as acid, alkali, and salt. The national standard model is 1Cr17Mn6Ni5N. Elemental manganese (and nitrogen) replacement of part or all of nickel in 201 stainless steel plate may produce lower nickel content than to reach equilibrium and form ferrite. Therefore, the ferrochromium content in 200 series stainless steel is reduced to 15%-16%, or even 13%-14%, then its corrosion resistance cannot be compared with 304 and other similar steels.

202 stainless steel is one of the 200 series stainless steel, the national standard model is 1Cr18Mn8Ni5N. The 200 series stainless steel is a low-nickel and high-manganese stainless steel with a nickel content and a manganese content of about 8%, which is a nickel-saving stainless steel. 202 is the American sign, instead of 1Cr18Ni9. Austenitic stainless steel is characterized by a high phase transition temperature, so it can be used as a heat-resistant steel. To make austenitic stainless steel undergo phase transformation, it must be heated to above 1000 ° C, and at 350 ° C, there will be no change in the metallographic structure, that is to say, the performance of the steel will not change fundamentally. It will only expand due to 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. It is its performance that 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-etching welding, rolling and forming, without any metal filler, filled with gas protection (inside and outside of the pipe) and welded. The welding method is TIG process, and online solid solution eddy current is used. flaw detection

From the point of view of the grade, 202 has one more manganese element and three more nickel than 201. In practical applications, in terms of utility, 202 is slightly better than 201, but most market users accept 201 material decorative tubes with lower prices and similar actual utility to 202. 202 has slightly more chromium and manganese than 201, and has slightly better mechanical and corrosion resistance, but strictly speaking, the performance of these two stainless steels is not much different in essence, especially in corrosion resistance.

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