ASTM A500 GR.B HOLLOW SECTION

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ASTM A500 GR.B HOLLOW SECTION

Standard: ASTM A500

Grade: GR.A, GR.B, GR.C, GR.D
Manufacturing Process: Cold-formed
WAll Thickness: 1.2MM - 50MM

Outside Diameter: 20MM × 20MM - 1200MM × 1200MM (SHS)
                                 20MM × 30MM - 1000MM × 1500MM (RHS)
Length: 1M - 25M, commonly used 5.8M, 6M, 12M
Application: STRUCTURAL BUIDLING
Surface Treatment: Galvanizing, Black vanish, Carving, Slightly oil painting, PVC clothes cover each bundle ect.

 Yield     Strength

 

Yield Strength is the maximum stress that a material can withstand before it becomes plastic. For metal materials, yield strength is an important mechanical property index, which marks the limit of material transformation from elastic deformation to plastic deformation.

On a stress-strain curve, the yield strength usually corresponds to a specific point on the curve, the yield point. For many metals, the yield point is a distinct feature that appears as an inflection point or plateau on a curve. At this point, the material begins to undergo plastic deformation, and the deformation continues even though the stress is no longer increasing.

Tensile Strength

 

Tensile Strength is the amount of stress a material is subjected to during a tensile test. It is an important mechanical property index to measure the resistance to tensile fracture of materials.

 

When a tensile test is performed, the material sample is stretched until it breaks. The tensile strength usually corresponds to the highest point on the stress-strain curve, indicating the maximum stress a material can withstand before breaking. When the tensile strength is reached, the material will break or be destroyed.

For ASTM A500 Grade B Hollow Section welding, there are some special requirements and standards to follow：

• Welding Type :

The ASTM A500 standard covers cold-formed welded and seamless carbon steel tubes used in welded, riveted or bolted structures for Bridges and buildings.

• Welding Process :

Welded pipe shall be made from flat rolled steel by an electric resistance welding process. The longitudinal butt weld of the welded pipe shall be welded at its thickness to ensure the structural design strength of the pipe section.

• Weld Position :

According to ASTM A500, the weld position of square, rectangular and other specially shaped pipes shall not be within the corner radius, unless otherwise specified by the customer or the manufacturer.

• Internal Flash :

According to ASTM A500, resistance welded pipes are usually provided without removing the internal flash. If flash control is required, please indicate this when quoting or placing an order.

These requirements ensure the quality and structural integrity of the ASTM A500 Grade B Hollow Section during welding.

The method of testing the welded quality of ASTM A500 Grade B steel pipe includes a variety of inspection techniques to ensure that the welded joint meets the design requirements and the requirements of use. Here are some common detection methods:

• Appearance Inspection : This is one of the most basic detection methods, through the visual inspection of the weld color, shape, surface quality, etc., can initially judge the quality of the weld. For example, the weld color should be uniform, the surface should be smooth without defects, and the width and height of the weld should meet the requirements.
• Size Detection : Use precision measuring tools such as ruler, micrometer and micrometer to measure the diameter, wall thickness and other dimensional parameters of the steel pipe and compare them with the specifications. Any size deviation outside the specification range may affect the quality and performance of the steel pipe.
• Non-Destructive Detection (NDT) : Use non-destructive testing technologies such as ultrasonic testing, X-ray testing and magnetic particle testing to check whether there are defects, cracks and other problems inside the weld. These methods can detect tiny defects inside the weld and ensure the overall quality of the weld.
• Tightness Test : For welds that need to be sealed, tightness inspection shall be carried out, such as pressure test, water pressure test, etc., to ensure that there is no leakage of welds in the tightness inspection.
• Quality Assessment And Record :According to the above inspection results, the quality of the weld is comprehensively evaluated and the quality grade of the weld is determined. Record weld quality inspection results, including inspection time, inspection personnel, inspection results, etc., for subsequent reference and analysis.

Through these testing methods, the welding quality of ASTM A500 Grade B steel pipe can be comprehensively evaluated to ensure the safety and reliability of welded joints.