Material application of chrome molybdenum steel valve
Release Time:
2022-09-13
Material application of chrome molybdenum steel valve
Chromium-molybdenum steel valves are one of the most widely used valves in power stations. The difference between other valves is that they are made of chrome-molybdenum steel. We still don’t know much about chrome-molybdenum steel valves, so I will briefly introduce them here.
CrMo steel is a low-alloy heat-resistant steel, which has good mechanical properties and hydrogen resistance at room temperature and high temperature. The main alloying elements in steel are molybdenum, chromium, vanadium, silicon, boron and so on.
Molybdenum is a very important alloying element in heat-strength steel. It significantly improves the heat-strength performance of steel, maintains sufficient strength at high temperatures, and can refine grains to prevent the overheating tendency of steel. However, steel containing only molybdenum has a long-term At high temperature, carbon will aggregate into graphite and precipitate, which will deteriorate the performance. In order to eliminate this tendency, elemental chromium is often added to steel at the same time. Adding chromium to steel can also improve thermal strength, high temperature oxidation resistance and corrosion resistance. This is because chromium can form a dense and highly adherent oxide film on the surface of the steel, thereby preventing the internal metal from being continuously oxidized or corroded. The higher the chromium content in steel, the denser the oxide film, and the better the oxidation and corrosion resistance.
The carbon content of low-alloy heat-resistant steel is below 0.20%, and the structure is mainly pearlite plus a small amount of ferrite. Most of them are delivered and used in the normalized state. After welding, it should be tempered at a temperature at least 100 higher than the service temperature.
Commonly used chromium-molybdenum steels in my country include 30CrMo (500°C), 35CrMo (525°C), 15CrMo (550°C), 12Cr2Mo1 (575°C), 1Cr5Mo (600°C) and so on. Note: The temperature in brackets refers to the upper limit of the operating temperature.
This kind of steel is used most in the design of power station valves, especially 15CrMo, 12Cr2Mo1, 1Cr5Mo
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High, medium and low pressure ball valves, gate valves, globe valves, butterfly valves, steam traps, regulating valves, pressure reducing valves, hydraulic control valves, throttle valves, power station valves, emergency shut-off valves, and other products.
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High, medium and low pressure ball valves, gate valves, globe valves, butterfly valves, steam traps, regulating valves, pressure reducing valves, hydraulic control valves, throttle valves, power station valves, emergency shut-off valves, and other products.
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