The quality of galvanized square tubes is affected by the selection of raw materials, production process, galvanizing process, and post-treatment.

The selection of raw materials will affect the quality. Galvanized square tubes usually use low-carbon steel or alloy steel as the base material. If the chemical composition of the steel does not meet the standard or there are defects inside it, it will affect the quality of the final product. High-quality raw materials can effectively improve the adhesion and corrosion resistance of the galvanized layer.

The production process will also directly affect the quality of galvanized square tubes. During the production process, hot rolling or cold rolling, welding method, and dimensional accuracy of the pipe need to be strictly controlled. These factors determine the strength and service life of the pipe to a certain extent.

The selection and control of the galvanizing process is also key. Hot-dip galvanizing and electro-galvanizing have their own advantages and disadvantages. Hot-dip galvanizing generally provides better corrosion resistance but has higher requirements for equipment and operation. During the galvanizing process, the temperature, time of molten zinc, and the immersion speed of the pipe will affect the uniformity and thickness of the galvanized layer.

Weld shape: The weld of straight seam welded pipe is a straight line, while the weld of spiral welded pipe is a spiral line with different spiral angles.

Raw material: Straight seam welded pipe requires a specific width of raw material strip or steel plate for each specification of steel pipe. Spiral welded pipe can produce steel pipes of different diameters using the same width of strip steel.

Stress: Due to the different weld shapes, the synthetic stress at the spiral weld is 60-85% of the main stress of the straight seam welded pipe. Therefore, under the same working pressure, the wall thickness of spiral welded pipe of the same diameter can be reduced than that of straight seam welded pipe.

Production: In the production of small and medium diameter welded pipes, straight seam welded pipes have greater advantages; in the production of large diameter welded pipes, spiral welded pipes have absolute advantages.

1. Pay close attention to weather changes: During loading, if the weather conditions are not good, try to close the hatches that are not in operation and close the hatches in time to prevent the goods from being wet by rain. Operations in the rain are prohibited.
2. Strictly load in accordance with the loading plan: During the loading process, the approved loading plan must be strictly followed. If problems are encountered, timely communication and adjustments should be made with the port.
3. Supervise the work of loading and unloading workers: During the loading and unloading process, the work of loading and unloading workers should be closely monitored, and the cargo conditions before and during loading should be recorded.
4. Keep the ship upright: The ship should be kept upright during loading. If the ship has a certain heel, measures such as padding and wooden wedges can be taken for easily movable cargo.
5. Check the watertightness of the hatch cover: After the cargo is loaded, if the hatch cover is not watertight, paint, cotton cloth, tape, etc. should be used to seal the hatch as necessary. Ensure all cargo hold doors are closed and locked.