The performance of welded steel pipe

　　The performance of welded steel 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. The corrosion resistance of the B204-44 building electric resistance welded steel pipe in the acidic environment is strong. In the environment containing sulfuric acid or hydrochloric acid, the higher the Ni content in the welded steel pipe, the stronger the corrosion resistance. In the general environment, simply add Cr in the welded steel pipe to 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 helix curvature diameter and welded steel pipe diameter Dc / D) on saturated bubble boiling heat transfer coefficient in vertical spiral tube.