Performance of welded steel pipe

　　Since 1930s, with the rapid development of high quality strip steel continuous rolling production and the progress of welding and inspection technology, the quality of welding seam is increasing, the variety and specification of welded steel pipe is increasing, and the seamless steel pipe is replaced in more and more fields. Welded steel pipe has lower cost and higher production efficiency than seamless steel pipe.

　　The corrosion resistance of 3mm Q235 Black Carbon ERW Welded Steel Pipe in the acid environment is strong when it contains Ni. In the environment containing sulfuric acid or hydrochloric acid, the higher the content of Ni in the welded steel pipe, the stronger the corrosion resistance. Under normal circumstances, only Cr is added to the welded steel pipe to prevent erosion. The poor edge condition of the steel strip is another important reason for the wrong side. The influence of mass flow, heat flux and structural parameters (the ratio of spiral curvature diameter and the ratio of welded steel pipe diameter of Dc/D) to the saturated bubble boiling heat transfer coefficient in a vertical spiral tube.

　　The production of welded steel pipe occurs when the wrong side occurs, and there are many influencing factors. In production practice, the steel pipe is often degraded by the wrong side. Therefore, it is necessary to analyze the causes and preventive measures of the wrong side of the welded steel pipe.