China Square Steel Pipes

In a large number of industries, square steel pipes are used. The production of this kind of pipes is increasing day by day.

With compare to round steel pipes, square steel pipes are little more efficient. The reason is that the square column is more efficient than the solid circular column.

In a traditional space frame, for the bar members, circular hollow section members are used. At the joint section, by welding along a curve surface, the bar members are joined. Therefore, this process takes very long time and seems to be difficult.

To make the problem easier, square steel pipes are used. The square steel pipes are used in a special configuration. Both the perpendicular sides of two square steel pipes are respectively aligned in perpendicular and parallel to the plane of the frame bodies. In this case, by butt-welding, the cross points of the bar members are joined along a short weld line

1 Square tube performance index - plastic

Plasticity refers to the metal material in the loading, the plastic deformation (permanent deformation) without the capacity to destroy.

2 Square tube performance index analysis - hardness

Steel pipe hardness is a pointer to measure the hardness of the metal material. Determination of hardness in the production method is the most commonly used is the indentation hardness method, which is under a certain load with a certain geometry of the indenter pressed into the metal surface to be tested, to determine the hardness value according to the degree of being pressed into. Common methods are Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV) method.

3 Square tube performance index - fatigue

Discussed earlier, strength, ductility, hardness, are the mechanical properties of metals under static loading pointer. In fact, many machine parts working under cyclic loading, under such conditions, parts will fatigue.

4 Square tube performance index analysis - the impact toughness

Known as the impact load in the load on the parts to the great speed of the role of metal called impact toughness under impact loading, the ability to resist damage.

5 Square tube performance index analysis - strength

Intensity refers to the metal material to resist damage (excessive plastic deformation or fracture) performance in the static load effect. As the load mode of action of the form of tension, compression, bending, shear, so the strength is also divided into the tensile strength, compressive strength, flexural strength, shear strength. Various intensities of certain frequent use is generally more to the tensile strength as the basic strength of the pointer.

Weled steel pipe specification, Standard and identification

Welded steel pipe (steel pipe manufactured with a weld) is a tubular product made out of flat plates, known as skelp, that are formed, bent and prepared for welding.


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