What do the flange material categories in the table of maximum impact pressure (Mpa) for flanges mean? How are values such as 1.0, 1.1, 1.2... determined?
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This post was last edited by security on 2011-4-25 09:24: [HG20592-HG20635-1997 Steel Pipe Flanges, Gaskets, Fasteners - wcnowxf]. What do the values for the maximum impact pressure (in Mpa) for flanges, as well as the categories of flange materials listed there (1.0, 1.1, 1.2, …), mean? How are these values determined, and where can I find this information? Operating temperature °C PN5.0MPA (CLASS 300) Flange material category 1.0 1.1 1.2 1.3 1.4 1.9a ≤383 3.95 5.11 5.17 4.79 4.25 4.74 503.85 5.01 5.17 4.73 4.17 4.68 1003.56 4.64 5.15 4.51** 1503.39 4.52 5.02*** 2003.18 4.38**** 2502.88 4.17**** 3002.57 3.87**** 3502.39 3.7**** 3752.29 3.65**** 4002.19 3.45**** 4252.12 2.88**** 4501.96 2.0**** 4751.35 1.35****
Hello, the original poster: Your table does not show the properties of flange materials, but in fact this table includes many different types of materials, each of which has its own pressure value at different temperatures. Here are a few examples (listed from top to bottom): A3, 20, 25, 16Mn; 15MnV, 12CrMo; 15CrMo. I won’t list them all here; you can refer to GB9193. However, this standard is a bit outdated, so you might consider using the American or European standards instead
Look it up in the flange standards; there is a specific section that explains the material categories, for example, 16MnⅡ is classified as 1.1.
Reply to 1# 45791978, friend: You can refer to the French standard HG20624, which contains the relevant specifications.