How should the width and length of samples be determined for re-inspection of pressure vessel steel plates upon arrival at the factory? Please provide an answer
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How should the width and length of samples be determined for re-inspection of pressure vessel steel plates upon arrival at the factory? Please provide an answer
This depends on the thickness of the steel plate as well as the complexity of the tests that need to be conducted. Generally, the thicker the steel plate, the larger the sample that needs to be taken (it is necessary to take into account the effects of the heat-affected zone when cutting the sample, ensuring that this area is completely removed during sample preparation). Additionally, there are specific requirements regarding the location and direction of sampling; if the design specifications provide guidelines, those should be followed. In the absence of such specifications, the standards «GBT 2975-1998 Mechanical Property Testing of Steel and Steel Products – Sampling Locations and Sample Preparation» should be applied
Just follow the sampling standards strictly. GB/T2975
:lol200*300 is enough too. . .
Check the product standards for this material; for example, the steel plates specifically used for boilers and pressure vessels are governed by GB/T713-2014. The product standards usually reference the sampling standards, with tensile testing typically following GB/T228 and impact testing generally following GB/T229
It seems that the sampling size varies depending on the thickness
It depends on which tests you need to repeat; are tensile, bending, and impact tests all required?
This size is also sufficient for taking samples.
The sampling location and methods are specified in clause A.6.3 of GB/T2975-2018; the sample dimensions are 55*10*10/7.5/5, as detailed in GB/T229-2007. The number of impact test specimens for retesting raw materials is generally 3.