What are the common defects of seamless steel pipe?

Seamless steel pipe is widely used, but there are many defects of seamless steel pipe, as follows
First, is the diameter of seamless steel pipe bend in line with the standard? The minimum bending radius is 4 times the diameter. If it is small, it will cause plastic deformation.
Second, the material of seamless steel pipe? In case of carbon steel, the heating temperature shall be 750-1050, in case of stainless steel, the heating temperature shall be 900-1200. Is the heating temperature not suitable?
Third, it may be the defects of the steel pipe itself, such as cracks, slag inclusions and so on.

Heat treatment defects of seamless steel pipe:
1. When the temperature in the furnace is not uniform and the atmosphere is not good, the performance of the steel pipe will be uneven, decarburization phenomenon will occur, burning and pitting may also occur, and the scale will be serious.
2. When the normalizing and tempering temperature is not well controlled, coarse grains (or wrong metallographic structure), unqualified mechanical properties and overburning may occur.
3. The cooling effect is not good, and the above nonconformities appear. The appearance of Widmanstatten tissue.
4. The cutting of the equipment is not good, and the steel pipe is dropped out of the pit.