Knowledge changes destiny, and knowledge can also affect life.
Let us look at the history of human development. The development of human beings is actually the history of the development of tools and equipment. From the ancient stone ax , it later evolved to bronze, and then iron was discovered. Since then, it has entered the Iron Age . The development and evolution of various tools represent the progress of human civilization.
Modern life is filled with metals and alloys of various materials, which penetrate every bit of our lives.
If you are careful enough, you will definitely find that the sinks are engraved with the words 304 or 201. Do you know what they represent?
When we opened a shopping platform to buy sinks, we were surprised to find that the difference between expensive sinks and cheap sinks was ten times greater. Why is this? Does the huge price difference have something to do with the words "304" or "201"? Next, the girl Sheng Neng will take everyone to have a look.
In our daily life, the most common ones on the sink are 304 or 211, and the others include 202 and 316. The biggest difference between them is the different compositions.
201 and 202 composition
201: Cr17Mn6Ni5N;
202: 1Cr18Mn8Ni5N
200 series disadvantages, Because the chromium content cannot be balanced with the low nickel content, resulting in iron, the proportion of chromium in the 200 series alloys is reduced to 13.5-15% , occasionally even reduced to 13-14%. Therefore, the corrosion resistance of 200 series steel cannot be compared with 304 and other similar steels. Moreover, the high manganese content is easy to rust. 200 series steel is usually used as decoration or on railway vehicles. The composition of
304 and 316
304: 06Cr19Ni10
316: The corrosion resistance of the two is different. Very small. In various types of water quality, the corrosion resistance of 304 and 316 is basically the same. The biggest difference between the two is that 316 It contains mo. Mo can passivate the steel surface in reducing and strong oxidizing solutions, which can improve the corrosion resistance of steel. In summary, 316 has better corrosion resistance than 304.
Focus: We The commonly heard food-grade stainless steel usually refers to 304 or 316.
Price difference
After reading the above content, I believe everyone should know to choose 304 stainless steel sink, but in our real life, we usually see different beginnings, such as sus304, svs304., etc. I would like to solemnly declare here that only Those starting with sus are genuine stainless steel products, and the others are fake.
Because the 200 series stainless steel only costs 7,000 to 8,000 tons, while the 304 series stainless steel costs 13,400 tons, and the 316 grade stainless steel can even reach 20,000 tons. Inferior stainless steel will rust in less than a year or two, and may even cause corrosion. Various industrial bacteria remain.
So what needs to be noted is that don’t buy stainless steel sinks because of the low price. If you want it to be cheap, it will harm your health. How about
, have you learned it
