It is cold drawn seamless pipe, which is to draw the metal pipe with a cold drawing machine without heating. The advantage is that it does not need to be carried out at high temperature. The disadvantage is that the residual stress is large, and it cannot be drawn too long. Cold drawing can improve toughness and tensile strength to obtain better mechanical properties.

Some difficulties are often encountered in the construction of steel sheet piles, and the following methods are often used to solve them:

Common steel pipes (such as seamless pipes or welded steel tubes) are 12 meters long and can be placed in the cabin. If the steel pipe is placed on the deck, it must be carefully tied to avoid damage during shipping.

The hardness test of the seamless pipe should take into account its mechanical properties, which is related to the performance and quality of deformation, stamping, cutting and other processing using stainless steel as raw material. Therefore, all seamless steel pipes should be tested for mechanical properties. There are two main types of mechanical property testing methods, one is tensile test and the other is hardness test.

Seamless steel pipes are composed of various elements in steel. These elements are combined in different proportions to form different mechanical properties of seamless steel pipes. The amount of any element will directly affect the mechanical properties of seamless steel pipes.

The basic reasons for defects in cold drawn seamless steel pipes are: