Seam pipe

Seam pipe, also known as welded steel pipes, are made of easily weldable carbon steel. It is nominally nominal, its common nominal size is DN15~100, and its largest nominal diameter is DN150(6). Welded steel pipes are often used for the transportation of hot and cold water and gas, so they are also called water and gas pipes. Galvanized welded steel pipes are customarily called white iron pipes at the construction site, while non-galvanized welded steel pipes are called black iron pipes. The blank used for welded steel pipes is steel plate or strip steel.

In the case of Ni-containing welded steel pipe containing Ni, the corrosion resistance is strong in an acidic environment. In the environment containing sulfuric acid or hydrochloric acid, the higher the content of Ni in the T-welded steel pipe, the stronger the corrosion resistance. In the general environment, it is only necessary to add Cr to the T-welded steel pipe to prevent corrosion. Poor edge conditions on the strip are another important cause of misalignment. The effect of mass flow, heat flux density and structural parameters (ratio of the diameter of the spiral curvature and the diameter of the T-welded steel pipe Dc/D) on the saturated bubble boiling heat transfer coefficient in the vertical spiral tube. In the production of T-welded steel pipes, there are many factors influencing the wrong side. In the production practice, the steel pipe is often downgraded by the dry and wrong side. Therefore, it is necessary to analyze the causes of the wrong side of the spiral steel pipe and its preventive measures.