Stainless steel is a common metal material inside the hardware industry, most people know that stainless steel can prevent rust, do you also know other information about it?
Today the color bead hardware effective company Mark for you to explain a brief introduction to stainless steel. Types of stainless steel can be distinguished by tissue state: austenitic steel, ferritic steel austenitic-ferritic (duplex) stainless steel, martensitic steel, ferritic steel and precipitation hardening stainless steel. In addition, according to the composition can also be divided into: chromium-nickel stainless steel, chromium stainless steel and chromium-manganese nitrogen stainless steel. There is also a special stainless steel used for pressure vessels “GB24511_2009_stainless steel plates and strips for pressure-bearing equipment”.
Ferritic stainless steel
Contains chromium 15% to 30%. Its corrosion resistance, toughness and weldability increase with the increase in chromium content, its resistance to chloride stress corrosion is better than other types of stainless steel, which belongs to this category are also Cr17Mo2Ti, Crl7, Cr25, Cr28, Cr25Mo3Ti, etc. . Although the ferritic stainless steel contains high chromium, oxidation resistance and corrosion resistance are relatively good, but its process properties and mechanical properties are poor, so it is mostly used for oxidation steel and acid-resistant structures that are not under stress. This type of steel can resist corrosion of the atmosphere, brine solution and nitric acid, and has good high temperature oxidation resistance, low coefficient of thermal expansion and other characteristics, suitable for nitric acid and food plant equipment, can also be made in the high temperature working parts, such as gas turbine parts.
Austenitic stainless steel
Contains more than 18% chromium, about 8% nickel and a small amount of titanium, molybdenum, nitrogen and other elements. It has a good overall performance and can withstand the corrosion of a variety of media. The common grades of austenitic stainless steel are 0Cr19Ni9 and 1Cr18Ni9 and so on. The Wc of 0Cr19Ni9 steel is less than 0.08%, and the steel grade is marked as “0″. This kind of steel is rich in a large number of Cr and Ni, can make the steel at room temperature in austenite state. These steels have good plasticity, toughness, weldability, corrosion resistance and non-magnetic or weak magnetic properties. They have good corrosion resistance in oxidizing and reducing media. Suitable for the manufacture of acid-resistant equipment, such as: nitric acid-resistant equipment components, equipment lining, transport pipes, corrosion-resistant containers, etc.. Also can be used in stainless steel watches, jewelry and other body materials. Austenitic stainless steel is usually solid solution treated by heating the steel to 1050 ~ 1150 ℃, and then water-cooled or air-cooled to obtain a single-phase austenitic organization.
Post time: Feb-08-2023