Black iron pipe

Is there any treatment for a welded pipe that is a black iron pipe.


The welded steel pipes or steel plates are bent into circular, square and other shapes, and then welded on the joint surface with steel pipes. The blank used in the welded steel pipe is steel or strip.


In the environment containing sulfuric acid or hydrochloric acid, the higher the content of Ni in the T shape welded steel pipe, the stronger corrosion resistance. In general, only Cr is added to T welded steel pipe to prevent erosion. The bad edge of the steel strip is another important reason for the mistake. The effects of mass flow, heat flux and structural parameters (helical curvature diameter ratio and Dc / D) on the boiling heat transfer coefficient of the saturated bubble boiling in a vertical spiral tube were investigated.


There are many factors affecting the production of T shaped welded steel pipes. In practice, the drying edges of steel pipes often deteriorate. Therefore, it is necessary to analyze the causes and preventive measures of the helical steel tube's side fault.