Issues with pipeline and flange materials
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On the equipment engineering drawings, it is stated that the materials for the main compression components are 00Cr19Ni10 and 00Cr19Ni10 II. What exactly is 00Cr19Ni10 II? Is there any difference between these two materials? What’s the difference between 16MnR and 16MnII as well? ?
00Cr19Ni10 refers to the material grade for steel plates, while 00Cr19Ni10 II denotes the grade for forgings. For more information, one can refer to the book \"Basic Knowledge of Pressure Vessel Use\". Similarly, 16MnR and 16MnII – in the former, the letter R indicates steel used for containers, whereas the latter refers to forgings. Another example is 16MnG, where G denotes steel used for boilers; 16MnHP-HP refers to steel used for gas cylinders
00Cr19Ni10 is stainless steel 304L. As a low-C version of 304 steel, it possesses corrosion resistance similar to that of 304 steel under normal conditions; however, it exhibits excellent resistance to intergranular corrosion after welding or stress relief. It can also maintain good corrosion resistance without heat treatment, and its operating temperature range is from -196°C to 800°C. It is used in outdoor machinery in the chemical, coal, and petroleum industries where high resistance to intergranular corrosion is required, as well as in building materials with heat-resistant properties and in parts for which heat treatment is difficult to carry out.