Seamless square tube classification

Introduction: The square tube association learned that the seamless square tube is a square tube type, which is rolled from strip steel after processing. Materials of many materials can form a square tube body. It is used for whatever purpose and where it is used. Most square tubes are steel tubes, mostly structural square tubes, decorative square tubes, building square tubes, etc. Generally, strip steel is unpacked, leveled, curled, welded to form a circular tube, then rolled into a square tube from the circular tube and cut to the required length. Usually 50 pieces per pack.  

1. Hardness

Hardness is a pointer to measure the hardness of metal materials. At present, the commonly used method for measuring hardness in consumption is the indentation hardness method, which uses an indenter with corresponding geometric shape to press into the surface of the metal material to be tested under the corresponding load, and determines its hardness value according to the degree of indentation.

Common methods include Brinell hardness (HB), Rockwell hardness (HRA, HRB, HRC) and Vickers hardness (HV).

2. Plasticity

Plasticity refers to the ability of metal materials to produce plastic deformation (permanent deformation) without damage under load.

3. Weariness

Strength, plasticity and hardness are all indicators of mechanical properties of metal under static load. In theory, many machine parts work under cyclic load, and under this condition, parts will become tired. Special shaped steel pipes with other sectional shapes are also required.

Galvanized welded steel pipe (GB/T3091-1993) for low-pressure fluid escort is also called galvanized electric welded steel pipe, commonly known as white pipe. It is a hot-dip galvanized welded (furnace welding or electric welding) steel pipe used for water, gas, air oil, heating steam, warm water and other ordinary low pressure fluids or other purposes. The wall thickness of steel pipe is divided into ordinary galvanized steel pipe and thickened galvanized steel pipe; The receiving end is divided into galvanized steel pipe without thread and galvanized steel pipe with thread.

The square tube association recently learned that the welded steel pipe (GB/T3092-1993) for low-pressure fluid escort is also called ordinary welded pipe, commonly known as black pipe. It is a welded steel pipe used for water, gas, air, oil, heating steam and other common low pressure fluids and other purposes. The wall thickness of steel pipe is divided into ordinary steel pipe and thickened steel pipe; The receiving end is divided into non threaded steel pipe (smooth pipe) and threaded steel pipe.

The specification of the steel pipe is expressed by the nominal diameter (mm), which is the approximate value of the inner diameter. Habits are often expressed in inches, such as 11/2. The welded steel pipe for low-pressure fluid escort is not only directly used for escorting fluid, but also widely used as the original pipe of galvanized welded steel pipe for low-pressure fluid escort. Ordinary carbon steel wire casing (GB3640-88) is a steel pipe used to maintain wires in industrial and civil buildings, installation of machinery and equipment and other electrical installation projects. The straight seam electric welded steel pipe (YB242-63) is a steel pipe whose weld is longitudinally parallel to the steel pipe. It is generally divided into metric welded steel pipe, welded thin-walled pipe, transformer cooling oil pipe, etc.

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