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What is the difference between stainless steel vacuum cup 304 and 201 material

Stainless steel vacuum flasks are generally made of 201, 202 and 304 stainless steel, and the most common two are 304 and 201 stainless steel. Although the materials are different, the stainless steel vacuum flasks produced by the two materials look the same, and ordinary people can hardly identify them. Even people in the stainless steel industry may not be able to distinguish 100% between 304 and 201 stainless steel.
can be judged from the following points.
1.304 stainless steel has strong corrosion resistance and high price: the essential difference between 201 and 304 stainless steel is mainly manifested in the different elements contained in the two. The corrosion resistance and stamping performance of 304 stainless steel are far better than that of 201, and 304 stainless steel is generally used in places where the environment is complex and requires strong corrosion resistance. 201 is used for environmental requirements or where the stainless steel material is not required. high places.
2.304 stainless steel price is higher: in terms of price, 304 is also much higher than the price of 201. Because the quality of 304 is better than 201 stainless steel, and 304 is imported stainless steel plate, and 201 is domestic stainless steel plate, the price of 304 is naturally higher.
3.304 stainless steel has better toughness: 201 stainless steel is harder, with a bit of rigidity, and is easier to crack. The 304 stainless steel vacuum flask contains nickel, so it does not rust, and 304 stainless steel is more tough and has much better fatigue resistance than 201.
4.201 stainless steel is easy to rust: 201 stainless steel has higher manganese content, and the surface is very bright with dark and bright, and higher manganese is easy to rust. The vacuum flask made of 304 stainless steel contains more chromium, and the surface is matte and does not rust. When choosing a stainless steel vacuum flask, it is obvious that the two cups are put together and compared. (You can experiment with potions).
5.304 stainless steel vacuum flask is not easy to rust because the formation of chromium-rich oxide on the surface of the steel body can protect the steel body, so as to achieve the effect of healthy drinking. The 201 stainless steel is a high-manganese stainless steel, which is harder than 304, high-carbon and low-nickel.
In addition, when judging the material of the stainless steel vacuum flask, there is also a misunderstanding that the "stainlessness" of the stainless steel vacuum flask is not absolutely non-rusting, but relatively non-rusting under certain conditions. If consumers use it improperly (such as in the case of making tea, coffee, milk and other acidic substances), using it in an environment or condition that exceeds its corrosion resistance, it will naturally rust.
If there is rust in the vacuum flask, there are mainly the following possibilities:
1. The stainless steel material used appears to be corroded and rusted, which may be due to the unreasonable selection of materials by the manufacturer, that is, the vacuum flask manufacturer has selected inappropriate stainless steel grades as raw materials for the purpose of its products.
2, it may also be that the manufacturer's production and processing technology is not good enough.
3, or because the thermos cup manufacturer has indeed selected fake and inferior stainless steel as raw materials on the market that does not meet the authoritative standards of the relevant country or industry.