Flame cutting for 15CrMoR steel blanking
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Our factory is now planning to manufacture a pressure vessel made of 15CrMoR steel. Could anyone tell me if flame cutting can be used for cutting the material?
Flame cutting can be used for cutting the material. However, an MT or PT inspection of the cut surface shall be carried out in accordance with clause 10.2.2 b) of GB150.
Yes, but an MT test should be conducted after processing.
Of course, flame cutting can be used for cutting, but the cut surface must be inspected using MT or PT in accordance with the specified requirements.
It’s possible, but the groove must be inspected 100% by MT.
Does anyone know why we need to do MT?
Since 15CrMoR steel is a heat-resistant steel with high sensitivity to thermal cracking, cracks are likely to form at the groove area after the material is heated; testing the groove is done to detect any microcracks.
Of course, flame cutting can be used for cutting the material, but the surface of the cut edges must be inspected using MT or PT methods in accordance with relevant standards. Since 15CrMoR steel is a heat-resistant steel, it is quite sensitive to thermal cracking; cracks are likely to appear at the groove area after the material is heated
Of course, flame cutting can be used for cutting the material, but the surface of the cut edges must be inspected using MT or PT methods in accordance with relevant standards. Since 15CrMoR steel is a heat-resistant steel, it is quite sensitive to thermal cracks; cracks are likely to appear at the groove area after the material is heated. Additionally, the cut areas must be thoroughly polished before welding, in order to minimize the impact of these thermal cracks
Yes, but the groove needs to be ground after cutting. If the thickness does not exceed 10 mm, it is not necessary to perform color inspection on the crack. Moreover, based on our on-site welding practices, it was found that 15CrMoR also does not have a high crack sensitivity.
Now there are high-pressure water cutting machines that are CNC-controlled; using these for cutting eliminates the need for surface inspection.
It’s not necessary; it needs to be preheated before cutting.