Corrosion properties of T welded carbon steel pipe

T welded carbon steel pipes containing nickel (Ni) exhibit strong corrosion resistance in acidic environments, such as those containing sulfuric acid or hydrochloric acid. The higher the nickel content in the T welded carbon steel pipe, the stronger its corrosion resistance. In general environments, adding chromium (Cr) to T welded steel pipes prevents erosion.

During the production of welded carbon steel pipes, misalignment can occur due to various factors, which often results in the downgrading of the steel pipes. It is essential to analyze the causes of misalignment in spiral steel pipes and implement preventive measures.

Misalignment can be caused by the poor precision of the shape and size of the non-cutting edges of the steel head and tail, leading to hard bending. Three types of vertical T welded steel pipes were studied: pipes with a diameter (D) of 10mm, with variations in the curvature diameter and helical pitch. The specific parameters include:

Pipe diameter D = 10mm

Pipe lengths: 503mm, 660mm, 817mm

Helical curvature diameters (Dc): with D = 10mm and ratios of Dc/D = 15, 20, 25

Helical pitch (Pt): 20mm

Saturated flow rate (G): 200-400 kg/(m²·s)

Heat flux (q): 5-15 kW/m²

Saturation pressure (p): 0.414880 MPa

Saturation temperature (T): 283.15K

By understanding and controlling these parameters, it is possible to improve the production quality and reduce the incidence of misalignment in T welded carbon steel pipes.