The medium is steam and condensed water; valve selection under high pressure and high temperature conditions

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1. DN10 stop valve, P≤32MPa, t≤450℃; capable of withstanding these temperature and pressure conditions over the long term. The valve body is made of stainless steel of grade 316 or higher, the stem sealing filler is graphite, and the connection type is socket weld； Interface size ф16x3/ф16x3. 2. DN10 globe valve, P≤32MPa, t≤560℃; these temperature and pressure conditions must be met over the long term. The valve body material should be at least 316 stainless steel, and the seal packing for the valve stem is made of graphite. Interface type: socket welding ； The interface dimensions are ф16x3/ф16x3; the medium is steam and condensate. Should high-pressure, high-temperature, small-diameter valves used in power plants be made of forgings? Therefore, should the material used for that one component be 316L? Given the long-term usage, should these two locations use materials with higher heat resistance, such as 310s, rather than the conventional stainless steels like 304, 304L, 316, and 316L, for long-term use? For 310s, at what temperature does it start to become brittle?