The vast majority of product standards for seamless pipes only specify basic inspection items such as chemical analysis, tensile testing, and non-destructive testing; they do not mandate flaring and flattening tests. However, our company is equipped with a full set of flaring and flattening test equipment and has the capability to perform both of these tests. Therefore, if your order or technical specifications include such requirements, we can conduct flaring and flattening tests on the pipes in accordance with standard methods.

Typically, we only provide seamless pipes with pickled or polished surfaces depending on specific requirements. Sand blasting is not a standard process. We will not sand blast the pipes unless we determine it is necessary. If you require sand blasting, please notify us in advance, and we will certainly accommodate your request.

Cold drawing is a process that uses drawing to alter the dimensions of seamless pipes. During this process, an outer die and an inner die work together to reduce the outer diameter of the seamless pipe while simultaneously thinning the wall thickness. When the inner die is not used and only the outer diameter is altered, this method is called sinking. Cold drawing is a form of cold working, which increases the strength of the material.

Straightening is the process of straightening a bent tube by passing it through a series of straightening rolls. Generally, tubes develop noticeable bends after each cold rolling, cold drawing, and annealing operation. If these bends are not corrected promptly, they may lead to uneven wall thickness during the next cold working operation. At the same time, straightening ensures the straightness of the final product.