2Cr12Nimowv (22Cr12NiwmoV) heat-resistant steel is a structural material widely used in high-temperature environments. Its superior performance allows it to play an important role in key components such as high-temperature structural components, steam turbine blades, discs, impeller shafts, bolts, etc. This article will detail the properties, scope of application, chemical composition, and mechanical properties of this heat-resistant steel.
First of all, the characteristics of 2Cr12Nimowv heat-resistant steel give it excellent strength and oxidation and corrosion resistance in high-temperature environments. This makes it an indispensable material for boilers, steam turbines, power machinery, industrial furnaces, as well as in industrial sectors such as aviation and petrochemicals. Under high-temperature working conditions, in addition to requiring the material to have sufficient high-temperature strength, it is also necessary to consider its ability to resist high-temperature oxidation and corrosion. In addition, depending on the use occasion, the material is also required to have sufficient toughness, good machinability and weldability, as well as certain microstructure stability.
In order to meet these requirements, 2Cr12Nimowv heat-resistant steel is carefully designed in terms of chemical composition. Its main elements include carbon (C), silicon (Si), manganese (Mn), sulfur (S), phosphorus (P), chromium (Cr), nickel (Ni), vanadium (V), molybdenum (Mo) and tungsten (W). The amount of these elements in the steel is tightly controlled to ensure that the material has excellent performance in high-temperature environments. Specifically, the carbon content is controlled at 020～0.between 25% to improve the strength and hardness of the steel; The content of silicon does not exceed 050% to enhance the toughness and weldability of the steel; The content of manganese element is 050～1.00%, which helps to improve the strength and hardness of steel; The content of sulfur and phosphorus is controlled at 0030% and 0035% or less to reduce the brittleness of steel; The chromium content is in the range of 1100～13.00% to improve the oxidation resistance and corrosion resistance of steel; The nickel content is 050～1.00%, which helps to enhance the toughness and machinability of steel; The contents of vanadium, molybdenum and tungsten elements are in. 75～1.25% and 070～1.Together, these elements increase the strength and hardness of the steel and enhance its high-temperature stability.
In addition to the chemical composition, the mechanical properties of 2Cr12Nimowv heat-resistant steel are also an important reason why it is widely used. After quenching and tempering treatment, the tensile strength b of the steel can reach more than 885MPa, and the conditional yield strength is 02. It can reach more than 735MPa. In addition, the elongation δ5 and section shrinkage of the steel are not less than 10% and 25% respectively, indicating that it has good plasticity and toughness. In terms of hardness, the hardness in the annealed state does not exceed 269HB, and the hardness in the quenched and tempered state does not exceed 341HB, which ensures that the steel can maintain sufficient strength in a high-temperature environment, and can maintain a certain toughness and machinability.
Since 1952, when China began to produce heat-resistant steel, after decades of development and innovation, some new types of low-alloy hot-strength steel have been developed, which has increased the working temperature of pearlitic thermal-strong steel to 600 620. At the same time, some new low-chromium-nickel oxidation resistant steel grades have also been developed to meet the needs of use in different high-temperature environments. The R&D and application of these new heat-resistant steels have further promoted the development of the field of high-temperature materials in China.
In a word, 2Cr12Nimowv (22Cr12NimowV) heat-resistant steel plays an important role in key components such as high-temperature structural components, steam turbine blades, discs, impeller shafts, bolts, etc., due to its excellent high-temperature properties, reasonable chemical composition and excellent mechanical properties. With the continuous progress of science and technology and the rapid development of the industrial field, it is believed that this heat-resistant steel will have a broader application prospect in the future.