Mechanical damage on the surface of the steel plate
Thread Content
In pressure vessel manufacturing, mechanical damage to the steel plate surface is a common issue – what should be done?
Grinding should be performed to smooth out sharp scars. The grinding depth for cold coil cylinders should be less than or equal to 5% of the steel plate thickness, and not more than 2 mm ； After grinding the hot coil cylinder, the wall thickness of the steel plate at the ground area should be no less than the effective thickness of the steel plate. If the wall thickness after grinding decreases by more than the specified value, repair welding must be carried out. The repair welding shall comply with the welding procedure specifications; after welding, heat treatment (if required) shall be applied, followed by grinding to make it level with the base material, and it must pass non-destructive testing.
According to strict requirements, pits with a depth greater than 0.5 mm are generally difficult to handle.