source：TuoGuanview：
304 stainless steel has become indispensable in daily life. 304 stainless steel appears in industrial production and other fields. It has a high reputation at home and abroad. So what is 304 stainless steel after all?
People often think that "stainless steel" is "steel that does not rust". If it rusts, it must be a fake and inferior product. This kind of knowledge is of course too brief.
The "stainlessness" of stainless steel is not absolutely non-rusting, but relatively non-rusting under certain conditions. If the user uses it improperly and uses it in an environment or condition that exceeds its corrosion resistance, it will naturally rust.
The second is that the stainless steel used in the product is corroded and rusted. It may also be due to the unreasonable selection of materials by the manufacturer, that is, the manufacturer has selected inappropriate stainless steel trademarks for the use of its products as raw materials, or the manufacturer’s production and processing skills are not sufficient.
In addition, the manufacturer did choose the fake and inferior stainless steel in the market that did not meet the relevant national or professional prestige standards as raw materials.
In any case, these are the things that manufacturers should face and solve when purchasing and processing. In response to the fact that there were still cases of production and sale of low-quality stainless steel in the market at the time, as well as the fraudulent behaviors of shopping malls such as shoddy and forged quality certificates, how can we take the initiative when purchasing stainless steel materials and quickly detect these frauds? Avoid the hazards of fake and inferior stainless steel? Regarding these perhaps the same beautiful stainless steel, it is difficult to distinguish between the true and the false from the appearance, even as an expert, is there any easy way to do it after all?
Someone said: This is very simple, use a magnet to attract! What can not be absorbed is good, it is "stainless steel", what is sucked is bad, it is "stainless iron"! At present, this kind of argument and practice seems to be very popular, and even some scientific publications and TV programs have implemented this law. Regarding this statement and practice, professional experts have denied it, which is unscientific and extremely wrong.
Among the five major types of stainless steels that have been developed and used in the world, only austenitic stainless steels (many 300 series trademarks and 200 series trademarks) are often non-magnetic (or weakly magnetic after processing), while ferritic stainless steels (many 400 series trademarks) ), duplex stainless steel, martensitic stainless steel, and deposition hardening stainless steel are all magnetic.
