Regarding the pipe material issue

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For some metal materials, information on their performance in practical applications cannot be found online. For example, there are many types of materials used for steam pipes, but there is no professional data available to determine which ones are the best; people simply use the most common ones, or those recommended by design firms. I started working in this field later in life, so my understanding of pipe materials is quite vague; my questions are also general and I can’t pinpoint the key points. Could some experts give me some guidance? For example, how to choose materials (it’s said that the material selection tables are internal documents of design institutes and not available to the public), their physical and chemical properties, prices, what materials are available that meet the same standards, and the advantages and disadvantages of each material. To give a small example: for materials like 20, 20G, and 25, information on their composition is available online, but it’s not possible to conduct a practical analysis based on that information. . Kneeled down