Is the stabilization heat treatment for stainless steel TP347 in high-pressure thick-walled pipes really effective?

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I saw a report, let’s all discuss it ======================================== The process pipelines in paraffin hydrogenation units are mostly high-temperature and high-pressure pipelines; the most critical of these is the high-pressure thick-walled pipeline made of stainless steel TP347. The design specifications require that this pipeline undergo stabilization heat treatment. During heat treatment, as the temperature continues to rise, significant stress is generated, which increases the likelihood of intergranular corrosion and creates potential quality issues. Furthermore, during the heat treatment process, the weld seam needs to be heated to 900°C, a process that takes around 12 hours or more, which not only increases construction costs but also results in a significant loss of time. “For other refining and processing units, there have also been cases where the stabilization heat treatment for TP347 material was omitted, and those units have continued to operate smoothly to this day. ”Adhering to the principle of quality first, Deng Shi researched various construction materials thoroughly, held numerous discussions with related organizations, and used the Huizhou Petrochemical Phase II project and the Shenhua coal-to-oil facility as examples to conduct repeated tests and validations with the design team. A path can only be created by taking steps to pave it. Through nearly a year of effort, and with the support of numerous successful cases and relevant data, the designers finally agreed to adjust the construction specifications, removing the requirement that the TP347 material undergo pre-stabilization heat treatment; this saved the project a significant amount of time and cost.