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A Simple Method To Identify 304 And 201 Stainless Steel

Aug 31, 2021

304 stainless steel is one of the most widely used mainstream steel grades at present, because of its obvious corrosion resistance, while 201 stainless steel has relatively poor corrosion resistance, resulting in different widely used areas and different prices. The price of 201 is lower than that of 304. In reality, some opportunistic and bad stainless steel manufacturers will pretend to be 304 to promote and sell externally in order to obtain high profits. In order to prevent you from being deceived by bad stainless steel suppliers, Huaxiao Stainless Steel has summarized three easy-to-understand methods based on our experience to identify 304 and 201 stainless steel:


1. Look with naked eyes and touch with hands.

304 and 201 stainless steel, the surface is usually matte. So we identify it by looking at it with the naked eye and touching it by hand. From the material surface color, 201 stainless steel contains more manganese element so that the surface color is darker than 304, 304 should be brighter and whiter, but this is not easy to distinguish them by the naked eye.


Grades(AISI)

C

Si

Mn

P

S

Ni

Cr

Mo

Cu

N

304

0.07

1.00

2.00

0.035

0.03

8.1-10.0

17-19

_

_

_

201

0.15

1.00

5.5-5.7

0.06

0.03

3.3-3.5

16-18

_

_

0.05-0.25


304 Stainless Steel

304 Stainless Steel

201 Stainless Steel

201 Stainless Steel


In addition, wet your hands with water and touch the two types of stainless steel separately. After touching the water-stained fingerprints on 304 stainless steel, it is easier to erase, and 201 is not easy to erase.


2. Polish with a polishing machine and watch the sparks.

Use a polishing machine to install a grinding wheel to lightly polish the two types of stainless steel. When polishing, the sparks of 201 stainless steel are longer, thicker and more. On the contrary, the sparks of 304 stainless steel are shorter, thinner and less. When polishing, the force must be light, and the two types of polishing force are the same, which is convenient for distinguishing.


3. Pickling cream, look at the color.

Apply stainless steel pickling paste on two types of stainless steel plates respectively. After 2 minutes, watch the change in the color of the stainless steel where it is applied. The black color is 201 material, and the white or discoloration is 304 material.


The above are some super simple methods to identify 201 and 304 stainless steel summarized by Huaxiao Stainless Steel Collection. I hope to help you. More stainless steel knowledge will be updated continuously. I hope you will pay more attention!