What material is used for steam pipes at 450°C?

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According to DL/T 5054-2016, the operating temperature range for commonly used domestic materials is specified in Article 13 of TSG G0001-2012; however, I spent a long time trying to find what Article 13 actually says； Mosaicking means following Appendix A of GB 50764-2012; Appendix A specifies the allowable stress for materials. For steel pipe type 20 under GB 3087, the maximum temperature specified in GB 50764 is 450℃ ； I also looked up the information on materials in TSG G0001-2012; take a look: if it is a pipe rather than a heat exchange tube, then for steel pipe of material 20 as specified in GB 3087, the maximum temperature specified in 50764 is 430℃ ； The materials that meet the requirements should be 15Ni1MnMoNbCu, 12CrMoG, 15CrMoG, 12Cr1MoVG, and 12Cr2MoVG. If steel pipes made of 20 or 20G material cannot be used in steam pipelines at 450°C, then which of these alloy steel pipes is the cheapest? What materials are used in your industry? If steel pipes made of 20 or 20G material are to be used in steam pipelines at 450°C, what quality certification documents must be provided by the manufacturer, and what tests need to be conducted?