The difference between stainless iron and stainless steel lies in the composition of nickel.

The magnetic is iron, and the nonmagnetic is stainless steel. This statement is totally wrong. There are four systems in stainless steel: austenite, martensite, ferrite and duplex. The austenite is not magnetic, but it is slightly magnetic due to the loss of some elements during processing;

Therefore, it is recommended to judge by chemical inspection and stainless steel composition comparison table.

Many daily necessities on the market today are actually "stainless steel" products, although the signboard says stainless steel. So, what is the difference between stainless steel and stainless iron? First of all, what are stainless steel and stainless steel? Difference in meaning:

Stainless steel is generally the general name of stainless steel and acid resistant steel. Stainless steel refers to steel resistant to weak medium corrosion such as atmosphere, steam and water, while acid resistant steel refers to steel resistant to chemical etching medium corrosion such as acid, alkali and salt. Stainless steel has a history of more than 90 years since it came out at the beginning of this century. The invention of stainless steel is a major achievement in the world metallurgical history. The development of stainless steel has laid an important material and technical foundation for the development of modern industry and scientific and technological progress. There are many kinds of stainless steel with different properties, which have gradually formed several categories in the development process. According to the structure, it can be divided into four categories: martensitic stainless steel (including precipitation hardening stainless steel), ferritic stainless steel, austenitic stainless steel and austenitic ferritic duplex stainless steel; Classified according to the main chemical composition of steel or some characteristic elements in steel, it can be divided into chromium stainless steel, chromium nickel stainless steel, chromium nickel molybdenum stainless steel, low carbon stainless steel, high molybdenum stainless steel, high purity stainless steel, etc; The steels are classified into nitric acid resistant stainless steel, sulfuric acid resistant stainless steel, pitting resistant stainless steel, stress corrosion resistant stainless steel and high-strength stainless steel according to their performance characteristics and uses; According to the functional characteristics of steel, it can be divided into low-temperature stainless steel, non-magnetic stainless steel, free cutting stainless steel, superplastic stainless steel, etc. At present, the commonly used classification method is based on the characteristics of steel structure and chemical composition, as well as the combination of the two. It is generally divided into martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, duplex stainless steel and precipitation hardening stainless steel, or into chromium stainless steel and nickel stainless steel.

The so-called "stainless iron" refers to the recycled scrap iron, lead, steel, etc., which is processed by re refining and then processed by removing "Zizi". The traditional detection method is to use iron absorption stone, which is indistinguishable by traditional methods. Naturally, it is a way of hiding the truth and blinding many engineering materials. Therefore, the land of Emperor Tang has entered one decoration site after another and boarded one luxury curtain wall after another. This name was born after the exposure of Focus Interview, and accounts for about 65% of the market share. The real national standard SUS304 stainless steel products have no market because of their high prices.

Identification from the mark: many stainless steel products are stamped with steel seals, such as 13-0, 18-8, etc. The number in front of the short line indicates the chromium content of the product, and the number behind the short line indicates the nickel content of the product. Like 13-0, it only contains chromium but no nickel, commonly known as "stainless iron"; 18-8 indicates that the product contains both chromium and nickel, which is stainless steel. Negotiation from sound: knocking stainless steel or "stainless iron" products can also be used as a judgment method. Use permanent magnet to attract: real stainless steel is not attracted by magnets, while "stainless iron" can be attracted by magnets. Although "stainless iron" and stainless steel have different properties, their corrosion resistance is obviously better than that of wrought iron and cast iron cookware.