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How to distinguish between 304 stainless steel pipe and 201 stainless steel pipe

by:HHGG     2021-04-06
How to distinguish between 304 stainless steel pipe and 201 stainless steel pipe 2018-12-24 When there is no steel stamp on the stainless steel pipe, how to distinguish whether the stainless steel pipe is 304 or 201? In fact, the characteristics of the two stainless steels are very similar, with only nickel and manganese in composition. Let’s take a look at the difference between the two of them in terms of chemical composition: 201: C: ≤0.15, Mn: 5.50-7.50 P: ≤0.060 S: ≤1.00 Si: ≤1.00 Cr: 16.00-18.00 Ni: 3.50-5.50 N: ≤0.25304: C: ≤0.08, Mn: ≤2.00 P: ≤0.045 S: ≤0.03 Si: ≤1.00 Cr: 18.00-20.00 Ni: 8-10.50 N: ≤0.10. In fact, 304 and 201, as an ordinary consumer, basically have no easy way to distinguish them quickly. There are two more effective methods: stainless steel potion and spectral analysis, but both of them are not convenient to experiment. The stainless steel syrup is only to analyze the nickel content in stainless steel, which is achieved by changing the color, so it is not a very accurate method. Spectral analysis: Generally available in quality supervision departments, research institutions, and factories, let’s see if the methods spread on the Internet are effective: 1. Judging by color and appearance: 201 stainless steel will be darker than 304 because of more manganese. It should be brighter, but there is no standard sample comparison, it is difficult to distinguish with the naked eye. 2. Through magnet: only the difference between austenitic stainless steel and ferritic stainless steel and martensitic stainless steel can be detected, but ferritic stainless steel and martensitic stainless steel cannot be distinguished. After 304 stainless steel is cold worked, the structure will also transform to martensite. The greater the degree of cold working deformation, the more martensite transformation and the greater the magnetism. 201 stainless steel can also be non-magnetic through technical means, so it is not reliable.  
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