Thermal Pipe Expansion Raw Material Choose

Raw material kinds and size not only matter product quality but also the output, to get the needed Chemical composition Mechanical properties Surface state Geometry, etc.

1.1?Diameter of raw material

Based on the finished pipe diameter D1, the expansion ratio will decide the raw material diameter D0. Normally the Expansion ratio is 1＜D1/D0＜1.56. As the expansion process increases, the expansion ratio will decrease, The first time best expansion is 1.4; the second time best expansion ratio is 1.3; the third time best ratio is 1.2.

1.2?Wall thickness of raw material

Based on the experience, the first time expansion wall thinning is 8%, the second time expansion is 16%. What will affect the wall thinning is the expansion ratio, material, temperature, etc.

1.3?The surface of raw material choose

From the force analysis, three forces will exist during the pipe expansion:

Axial force radial force tangential force. So, if the surface quality is not good, there is no doubt the defect will be much bigger. Surface quality checking is very necessary, the following defect not allowed: Cracks Delamination Folds Bends Scars pit scratch, etc. All above defects must be cleaned up, the depth of cleaning not allowed to belong the standard requirement normal wall thickness, after cleaning wall thickness not allowed to be smaller than min value.

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