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High Temperature Characteristics Of Stainless Steel Tubes
Nov 20, 2018

With the development of petrochemical, aerospace and power machinery working at high temperatures, heat-resistant steel has also developed rapidly. Such as steam boilers for steam power generation, steam turbines or gas turbines, jet engines for the aerospace industry, and components for heating furnaces that are generally used for production, they all work in high temperature environments and are subjected to various loads such as stretching and bending. , torsion, fatigue, etc., some parts are also subjected to impact loads. In addition, the steel components are also in contact with high-temperature steam, air or gas during operation, and the surface is subject to high temperature oxidation or gas corrosion. Steel parts that work in high-temperature environments and steel parts that work in high-temperature or low-temperature environments are fundamentally different in temperature. At high temperatures, atomic diffusion processes occur in steel parts, which may occur during use. The transformation of the organization, so that the transformation of the structure may occur during use, and there is little diffusion of steel members working at room temperature and low temperature.

In a high-temperature environment, even if the steel member is operated for a long time under the stress of the yield strength of the material, deformation and fracture occur, and the parts are scrapped. Therefore, there are two basic requirements for the performance of heat-resistant steel used at high temperatures. One is to have sufficient high temperature strength, high temperature fatigue strength and plasticity suitable for it; the other is to have sufficient high temperature chemical stability. In addition, it should have good process properties (such as casting, thermal processing, welding, stamping, etc.) as well as physical properties, and so on.

Heat-resistant steel and stainless steel nail-to-steel are cross-over in the range of use. Some stainless steels have the characteristics of heat-resistant steel, which can be used both for stainless steel and heat-resistant steel.

As mentioned above, heat resistant steel refers to alloy steel which has high strength and good chemical stability at high temperatures. Therefore, heat-resistant steel can be divided into two types according to its properties: heat-strength steel and anti-oxidation steel (or high-temperature steel). Heat-strength steel refers to steel that has good oxidation resistance at high temperatures and has high high-temperature strength. Antioxidant steels generally require better chemical stability, but the load they bear is relatively low. Hot-strength steels are required to have high high-temperature strength and corresponding oxidation resistance.

Heat-resistant steel is commonly used in the manufacture of boilers, steam turbines, power machinery, industrial furnaces, and parts of the aerospace and petrochemical industries that operate at high temperatures. In addition to high temperature strength and high temperature oxidation resistance, these components require sufficient toughness, good processability and weldability, and certain structural stability depending on the application.

Heat-resistant steel can be classified into austenitic heat-resistant steel, martensitic heat-resistant steel, and ferritic heat-resistant steel according to its normalizing structure.