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Corrosion performance of welded steel pipe

2022-03-16 08:29:54   COMMENT:0 HITS:
When the t-welded steel pipe contains Ni, it has strong corrosion resistance in 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 general environment, only adding CR to t-welded steel pipe can prevent corrosion.
The poor condition of steel strip edge is another important reason for misalignment. Effects of mass flow, heat flux and structural parameters (ratio of spiral curvature diameter to t-welded steel pipe diameter DC / D) on saturated bubbly boiling heat transfer coefficient in vertical spiral pipe.
In the production of t-welded steel pipe, misalignment occurs from time to time, and there are many influencing factors. In production practice, the steel pipe is often degraded due to the wrong side and out of tolerance. Therefore, it is necessary to analyze the causes of spiral steel pipe misalignment and its preventive measures.
The shape of the steel strip is not easy to be bent due to poor butt joint accuracy of the steel strip. Simulated pipe diameter: OML = 660mm, pipe length: l = 660mm; Three kinds of vertical T-shaped welded steel pipes: the pipe diameter is d = 10mm, the ratio of curvature diameter of T-shaped welded steel pipe to spiral pipe diameter is DC / D = 15, 20 and 25 respectively, the spiral pitch Pt = 20mm, and the pipe length is L = 503mm, l = 660mm and l = 817mm respectively. 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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