Black iron pipe

Keywords:Black iron pipe
There is no treatment of welded steel pipe is black iron pipe.

Welded steel pipe is bent with steel or steel plate is round, square and other shapes and then welded into the surface of the seam with the steel pipe. The blank used in the welded steel pipe is steel or strip.

In the environment of containing sulfuric acid or hydrochloric acid, the higher the Ni content in the T-shaped welded steel pipe, the stronger the corrosion resistance is. In the general environment, only in the T-welding steel pipe to add Cr can prevent the phenomenon of erosion. Poor edge of the strip is another important cause of the wrong side. The influence of mass flow rate, heat flux and structural parameter (ratio of spiral curvature diameter and ratio of polygon welded pipe diameter Dc / D) on saturated bubble boiling heat transfer coefficient in vertical spiral tube.

T-shaped welded steel pipe in the production, the wrong side occurs, the impact of many factors. In the production practice, often by the dry edge of the steel pipe degradation. Therefore, it is necessary to analyze the causes of the wrong side of spiral steel pipe and its preventive measures.
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