Regarding the selection of temperature adjustment coefficients in the formula for calculating wall thickness of pipelines

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This post was last edited by ohayao on 2017-5-23 16:11. When calculating the minimum wall thickness of a pipe in SH3059, you need to select the correction coefficient of temperature for the pipe wall thickness, as shown in the attached formula. The materials here are divided into two categories: ferritic steel and austenitic steel. What steels are included in ferrite steel? After checking a lot of information, I still can't find the concept of ferritic steel. Please help me, heroes! ! ! I found it on Baidu: The carbon content of ferritic stainless steel is less than 0.15%, and the chromium content is between 12% and 30%. Due to the low mass fraction of carbon and the high mass fraction of chromium, there is no or very little mutual transformation between α phase and γ phase when the steel is heated from room temperature to high temperature or cooled. Both are single-phase ferrite structures, so they cannot be strengthened by quenching. Ferritic steel is carbon steel with very low carbon content. Its structure is a ferrite at room temperature, and its shape is good and its strength is low. For example, 08 Steel doesn’t know what the basis for this statement is? How to choose the temperature correction coefficient of ordinary carbon steel and low alloy steel?