When should it be indicated on the drawings that an impact test is required?
Thread Content
For example, when the design temperature is -15/55 and the operating temperature is -10/50, why is it specified in the drawings that 16MnⅢ must undergo an impact test with a value greater than 34 J?
I don’t understand. . Could you elaborate a bit more?
It is mainly related to the dielectric properties and design temperature.
Special notes for unconventional, uncommon, important, and other distinctive aspects. There are also surface inspections to be carried out at the joints of the end caps; the testing temperature for plate B should be no less than 15 or 20°C, etc
This post was last edited by fzujunru on 2019-6-15 at 17:41. Standards such as GB 713 for plates, GB 9948 for pipes, NB 47008 for forgings, etc., as well as GB 150.2, all specify requirements regarding the impact toughness of materials. If necessary, the design can stipulate requirements that exceed these standards – for example, conducting impact tests at lower temperatures, raising the acceptable values for impact energy, or increasing the number of sampling points; all of these should be indicated in the drawings. II. High-strength steels, including CrMo steel, as well as sheets with large thicknesses, can require design specifications that exceed standard levels due to their poor toughness and the risk of brittle fracture at low temperatures.
Because, in the 47008 standard, the specified impact test temperature is 0°C. This device is designed for temperatures below 0°C, and therefore does not meet the requirements of standard 47008. Therefore, this requirement should be specifically noted.
Thank you. . I would like to ask: since the impact value for Q345R on GB713 is also at 0 degrees, why isn’t it indicated in the chart that the impact value at -20 degrees should be used?
Generally, the diagram shows which parts and materials are required, as well as the number of low-temperature impact tests and the required impact energy. If designing something, it is necessary to refer to the requirements in the material section of GB/T150.2-2011 in order to specify the relevant impact requirements.
Take a look at the note under Table 10 in GB/T 150.2-2011, and you’ll understand