Valve material selection
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Main steam pipeline of medium-temperature and medium-pressure power plants. At a pressure of 4.0 MPa and with steam at 400 degrees, the design institute recommends using ZG20-450 for casting, while A105 is suggested for forging. The valve manufacturer states that carbon steel used for casting is not suitable; instead, high-temperature molybdenum steel should be used. Should I choose carbon steel or molybdenum steel? I would prefer to use carbon steel due to its lower cost, but the valve manufacturer says it will not be sufficient
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The operating temperature for carbon steel is 425 degrees; if your medium-pressure pipelines are constantly exposed to temperatures of 400 degrees, it is not recommended to use carbon steel – instead, molybdenum-vanadium steel should be used
In China, the largest size available for A105 forged fittings is DN200, and the cost of such fittings is very high