The JCOE forming process and UOE forming process of LSAW Steel Pipes differ in multiple aspects.

Forming principle and process

JCOE forming process: First, half of the steel plate is gradually pressed into a "J" shape through multiple step stamping. During this process, the steel plate is gradually bent in the forming mold, and each stamping brings the steel plate closer to the contour of the "J" shape. Next, perform the same operation on the other half of the steel plate and press it into a "C" shape. Finally, apply pressure to the "J" and "C" shaped steel plates from the middle to form an open "O" shaped billet. During the forming process, the steel plate is gradually fed into the forming mold through a steel pushing machine, and needs to be re straightened on each side before forming to ensure the accuracy and quality of the forming.

UOE forming process: Firstly, the edges of the steel plate are pre treated with chamfering, leveling, and bending. Then, a specialized U-shaped press is used to quickly press the steel plate into a U-shape, and the U-shaped press uses tremendous pressure to bend the steel plate into a U-shape at once. Next, use an O-shaped press to further press the U-shaped steel plate into an O-shape, forming a pipe blank. This forming method involves two large pressure forming steps to quickly achieve the desired shape of the steel plate.

Equipment and Investment

JCOE molding process: Each molding process is completed on a large press, with relatively simple equipment and fewer molds. Due to the lack of complex equipment such as specialized U-shaped and O-shaped presses like the UOE process, equipment investment is relatively low. However, the technical requirements for steel pipe shaping operation are high, and the forming unit takes up a long space, requiring a large site space to place equipment and carry out production operations.

UOE forming process: requires the installation of specialized equipment such as large U-shaped presses and O-shaped presses, which have complex structures, large volumes, and high costs, resulting in significant equipment investment. Moreover, the maintenance cost of the equipment is also high, requiring professional technicians to perform regular maintenance and upkeep to ensure the normal operation of the equipment. However, UOE equipment has a high degree of automation and production efficiency, making it suitable for large-scale, single specification steel pipe production. In the case of large-scale production, the unit cost is relatively low.

productivity

JCOE forming process: It belongs to progressive forming and requires multiple stamping and forming steps. The production process is relatively complex and the processing efficiency is low. Its annual output is generally around 100000 to 250000 tons, suitable for the production of multiple varieties and small batches of steel pipes. It can flexibly adjust production specifications and varieties, but its efficiency is not as good as UOE process in large-scale production.

UOE forming process: The forming process is relatively simple, mainly through two pressure forming processes of U-shaped and O-shaped, with a fast production rhythm and high production efficiency. Its annual output usually reaches 300000 to 1 million tons, suitable for large-scale and continuous production of single specification large-diameter steel pipes. It can quickly produce a large number of steel pipe products to meet the needs of large-scale engineering construction.

Product Quality and Accuracy

JCOE forming process: The dimensional accuracy of steel pipes is relatively lower than that of UOE process. Due to multiple forming processes, there may be some cumulative errors during the forming process. However, the JCOE process results in uniform deformation of the steel plate during the forming process, low residual stress, and less surface scratches. The comprehensive performance of the steel pipe is good. We have advantages in producing high-grade thick walled pipes, especially small and medium-sized thick walled pipes, which can meet the diverse requirements of more users in terms of steel pipe specifications.

UOE forming process: The produced steel pipes have good quality, high dimensional accuracy, and excellent performance in roundness, straightness, and other indicators. The use of diameter expansion process further improves the strength and dimensional accuracy of steel pipes, enabling the production of high-precision steel pipe products. It is widely used in fields such as marine pipelines that require extremely high quality and accuracy of steel pipes. However, due to the possibility of damage to the surface of the steel pipe caused by the diameter expansion process, corresponding treatment and repair are required in the subsequent production process.

scope of application

JCOE forming process: suitable for the production of multiple varieties and small batches of steel pipes, it can produce large-diameter, high-strength, thick walled steel pipes, as well as small-diameter and thick walled steel pipes, which can meet the diverse needs of different users for steel pipe specifications. In some special occasions, such as urban pipeline construction, small oil and gas transmission pipelines, the specifications and varieties of steel pipes are more flexible, and JCOE forming process can better adapt to these needs.

UOE forming process: mainly suitable for large-scale production of single specification large-diameter steel pipes, widely used in fields such as petroleum and natural gas transportation that require strict quality and performance of steel pipes. For example, long-distance oil and gas transmission pipelines, large-scale offshore oil and gas development projects, etc. require a large number of high-quality and high-precision large-diameter steel pipes. UOE forming technology can meet the large-scale and high-quality production needs of these projects.