Some common stainless steel knowledge errors

- Jan 11, 2019 -

I.Stainless steel will not rust

Stainless steel is an alloy material. It is added to various ordinary alloy elements such as nickel, manganese, carbon, molybdenum, etc., so that its material structure can achieve the effects of improving strength, toughness, hardness, corrosion resistance and life. In a certain environment, the pH in the air far exceeds the corrosion resistance of stainless steel. Stainless steel will also rust and corrode, so stainless steel will not rust, but it is more resistant than ordinary metal materials.

II.The magnet can test the true and false of stainless steel
It is very unreasonable to check the authenticity of stainless steel by magnet. Firstly, stainless steel can be divided into austenitic stainless steel, ferritic stainless steel, duplex stainless steel and other major categories, austenite (200, 300 series). The magnetic properties in stainless steel can be ignored, but ferritic stainless steel (400 series stainless steel) contains iron and carbon. If it has not been degaussed, it can still be attracted by the magnet. So I want to use a magnet to measure the authenticity of stainless steel? It is a bit ridiculous, and the inspection work is still more appropriate to third-party testing organizations.

III.It’s a quality problem if the stainless steel becomes dark after heating
Many end consumers have purchased kitchen utensils such as stainless steel pots. After the open flame is heated, a black layer of material will appear on the surface of the stainless steel. It is so sloppy that this is a problem with the quality of stainless steel, but it is not! Stainless steel has a certain high temperature resistance, generally can withstand high temperatures above 600 ° C, special high temperature resistant stainless steel can withstand high temperatures of more than 1200 ° C, so even if heated by open flame will not black, still can be used normally. As for the layer of dark matter, it is actually caused by impurities in the gas or the gas is not burned. Therefore, it is not the problem of the quality of the stainless steel, but the problem of natural gas or gas stove. 

IV.201 stainless steel can also be used as tableware
201 stainless steel is also known as “manganese steel” in the industry. Although manganese is a necessary trace element in the human body, if it is excessively consumed by manganese, manganese poisoning will occur, dizziness will be weak, and damage will be damaged. The nervous system of the human body, and it cannot be recovered; However, there is no need to worry too much. When purchasing related stainless steel products, you should see if there is a certificate of conformity, as long as the product is made of food grade stainless steel of model 304 or above, and all indexes reach the standard value and are not corroded. Rusty, still can be used normally.

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