Dongguan welded steel pipe chemical composition analysis and hardness testing [JMT testing]

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General welded pipes General welded pipes are used to transport low-pressure fluids. Made of steel. It can also be made of other mild steels that are easily weldable. Steel pipes need to be subjected to experiments such as hydraulic bending and flattening, and have certain requirements for surface quality. The delivery length is usually 10,000 square meters, and it is often required to be delivered in fixed length (or multiple lengths). The specifications of welded pipes are expressed in nominal diameter (millimeters or inches). The nominal diameter is different from the actual. According to the specified wall thickness, there are two kinds of welded pipes: ordinary steel pipes and thickened steel pipes.
Galvanized steel pipe In order to improve the corrosion resistance of steel pipes, general steel pipes (black pipes) are galvanized. Galvanized steel pipes are divided into two types: hot-dip galvanizing and electric steel zinc. Hot-dip galvanizing has a thick zinc layer and electro-galvanizing has low cost.
Oxygen-blown welded pipes are used for oxygen-blown pipes in steelmaking. They are generally small-diameter welded steel pipes with eight specifications: inch by inch. Made of or steel strip. To prevent corrosion, some are aluminized.
Wire sleeves are also ordinary carbon steel electric welded steel pipes, used in concrete and various structural power distribution projects. The commonly used nominal diameters range from . The wire sleeve has a thin wall and is mostly used after being coated or galvanized, requiring a cold bending test.
Metric welded pipe specifications are in the form of seamless pipes, welded steel pipes expressed in outer diameter * wall thickness in millimeters, welded with tropical cold zone of ordinary carbon steel, high-quality carbon steel or general low alloy steel, or with tropical welding Then it is made by cold drawing method. Metric welded pipes are divided into general and thin-walled pipes, which are generally used as structural parts, such as transmission shafts, or to transport fluids. Thin-walled pipes are used to produce furniture, lamps, etc. The strength and bending test of the steel pipe must be ensured.
The roller tube is used for belt conveyor roller electric welded steel pipe, generally made of steel and steel, diameter. There are certain requirements for the pipe bending end surface to be perpendicular to the center line and the ellipticality. Generally, water pressure and flattening tests are conducted.
Transformer tubes are used to manufacture transformer radiator tubes and other heat exchangers. They are made of ordinary carbon steel and require flattening, flaring and bending hydraulic tests. Steel pipes are delivered in fixed lengths or multiple lengths, and there are certain requirements for the bending of the steel pipes.
Special-shaped tubes are square tubes, rectangular tubes, hat-shaped tubes, hollow rubber steel doors and windows, which are welded from ordinary carbon structural steel and equal steel strips. They are mainly used as steel windows and doors for agricultural machinery components.
Welded thin-walled tubes are mainly used to make furniture, toys, lamps, etc. In recent years, thin-walled tubes made of stainless steel strips have been widely used in high-end furniture and decorative fences.
Spiral welded pipes are made by rolling low-carbon carbon structural steel or low-alloy structural steel strips into pipe blanks at a certain spiral angle (called forming angle), and then welding the pipe seams. It can be used Narrower strips produce larger diameter steel pipes. Spiral welded pipes are mainly used for oil and gas transmission pipelines, and their specifications are expressed by outer diameter * wall thickness. Spiral welded pipes are either single-sided welded or double-sided welded. Welded pipes should ensure that the tensile strength and cold bending performance of the weld in the hydrostatic test meet the regulations.
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