Steam valve
Thread Content
Why is carbon steel used for low-pressure steam valves, while chromium-molybdenum steel is used for high-pressure steam?
High-pressure steam has a high temperature; the maximum temperature for carbon steel is 400 degrees, and the temperature of high-pressure steam exceeds 400 degrees
What are the specific consequences of overheating?
Reduced strength leads to leakage, cracking, and even explosions: lol
The allowable stress of steel varies at different temperatures; therefore, the material of the valve is selected based on the steam temperature.
It’s not low pressure or high pressure; it’s related to temperature. There are also valves made of carbon steel that weigh 320 kilograms, while those made of chromium-molybdenum steel can weigh as little as 16 kilograms
There is a corresponding relationship between saturated steam and pressure: the higher the pressure, the higher the temperature. For low-pressure steam with lower temperatures, carbon steel can be used; however, for high-pressure steam with high temperatures, carbon steel is not suitable, and heat-resistant steel must be employed. Chrome-molybdenum steel can withstand high temperatures, so it is used for high-pressure steam.