Corrosion resistance of welded steel tubes

Tiempo de liberación:

2022-07-13 00:00

When the T-welded steel pipe contains Ni, it has strong corrosion resistance in the 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, just add Cr to T-welded steel pipe can prevent the occurrence of erosion phenomenon. The poor condition of steel strip edge is another important cause of wrong edge. Effect of mass flow rate, heat flux and structural parameters (ratio Dc/D of spiral curvature diameter to T-welded steel pipe diameter) on saturated bubble boiling heat transfer coefficient in vertical spiral pipe.
In the production of T-welded steel pipe, the wrong edge often occurs, and there are many influencing factors. In production practice, steel pipe is often degraded by the wrong edge. Therefore, it is necessary to analyze the causes of spiral steel pipe misalignment and its preventive measures.
Due to the poor shape and dimensional accuracy of the untrimmed steel lead and tail, it is easy to cause hard bending of the steel belt and cause wrong edge. Simulation parameters range: vertical pipe: pipe diameter D=lOmm, pipe length L=660mm; Three kinds of vertical T-welded steel pipes: pipe diameter D=10mm, the ratio of curvature diameter of T-welded steel pipes to spiral pipe diameter changes are Dc/D= 15,20,25, spiral pitch Pt=20mm, pipe length L=503mm, L=660mm, L=817MM. Mass flow G=200~400Kg/(m'2·s), heat flux q=5~15KW/m'2, saturation pressure p, saturation =0.414880MPa, saturation temperature T, saturation =283.15K.

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