According to the definition in GB/T20878-2007, stainless steel is a steel with stainless and corrosion resistance as its main characteristics, with a chromium content of at least 10.5% and a maximum carbon content of no more than 1.2%.
Stainless steel (Stainless Steel) is the abbreviation of stainless acid-resistant steel. The steel grades that are resistant to weak corrosive media such as air, steam, and water, or have stainless properties are called stainless steel; Corrosion) Corroded steel is called acid-resistant steel.
Due to the difference in chemical composition of the two, their corrosion resistance is different. Ordinary stainless steel is generally not resistant to chemical medium corrosion, while acid-resistant steel is generally stainless.
The term "stainless steel" does not simply refer to one kind of stainless steel, but refers to more than one hundred kinds of industrial stainless steels, and each developed stainless steel has good performance in its specific application field. Generally speaking, the hardness of stainless steel is higher than that of aluminum alloy, and the cost of stainless steel is higher than that of aluminum alloy.
Stainless steel is classified according to the elements contained in it. 304 food-grade stainless steel can be classified into chromium-nickel series or chromium-nickel-molybdenum series (300 series). Other main classifications include 304L, 316, and 316L. At the same time, these 300 series products also belong to austenitic stainless steel. Austenitic stainless steel is a kind of steel that is resistant to weak corrosive media such as gas, steam, and water, or has stainless steel properties. The thin-walled stainless steel that is now promoted and used is also made of 304 stainless steel. Thin-walled refers to stainless steel round tubes whose wall thickness to diameter ratio does not exceed 6%. For example, a DN15 pipe has a diameter of 16mm, a wall thickness of 0.8mm, and a ratio of wall thickness to diameter of 0.05.
