ASTM A500 Grade B


ASTM A500 Grade B

The ASTM A500 is a steel standard that covers cold-formed welded and seamless steel structural tubing in rounds and shapes. Grade B in the ASTM A500 standard is a steel grade that is used in construction, and it has a wide range of uses. 

ASTM A500 Grade B vs Grade C, it has a lower yield strength , but a higher yield strength than Grade A. The most common application for steel tube Gr. B is in construction, where it is used to create everything from tubular steel framing to steel beams. Steel tube Gr. B is a versatile material that can be used in a variety of construction applications. Its strength and durability make it an ideal choice for structural elements such as steel framing, and its affordability makes it a popular choice for common construction applications.

Why choose tuspipe?


Since 1998, Tianjin United Steel Pipe Co., Ltd (TUSPIPE) has been committed to supplying high-quality line pipes.

With over 500,000 tons annual production capacity, the company serves various fields and industries, such as oil & gas exploitation and transmission, ship & auto-building, water & electricity, environmental protection, mechanical engineering, infrastructure construction and etc.

TUSPIPE places a premium on product quality and rigorous product quality control. In order to maintain good product quality,  the company has established a Test & Inspection Center since 2004. With a series of state-of-the-art tests and inspection equipment, the test & inspection center is able to perform the tensile tests, hydro tests, impact tests, DWTT, etc.

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ASTM A500 Grade B Square & Rectangle Tubing

For our ASTM A500 Grade B square, rectangular, and special shape tubing, ensuring compliance with the specified ASTM A500 Grade B properties is imperative. It’s noteworthy that a flattening test, although a standard requirement for most, is not mandated for ASTM A500 Grade B non-circular tubes, further distinguishing their unique quality standards within our product range.

Grade Yield (min) Tensile (min) Elongation (min)
Gr. B 46,000 psi 58,000 psi Determined by wall

ASTM A500 Grade B Round Tubing

Below are the physical properties required to meet the three grades that we produce ASTM A500 Grade B round tubing.  A flattening test is also a standard requirement for round tubing produced to the ASTM A500 Grade B.

Grade Yield(min) Tensile (min) Elongation (min)
Gr. B 42,000 psi 58,000 psi Determined by wall

Chemical Requirements of ASTM A500 Grade B Pipes

Element Composition, %
Heat analysis Product analysis
Carbon 0.26 0.3
Manganese 1.35 1.4
Phosphorus 0.035 0.035
Sulfur 0.035 0.045
Copper 0.2 0.18


Physical Properties Metric English Comments
Density 7.80 g/cc 0.282 lb/in³ Typical of ASTM Steel

ASTM A500 Grade B Application Scenarios

ASTM A500 Grade B Superior Mechanical Properties:
ASTM A500 Grade B pipe has excellent strength, tensile strength and malleability, making it ideal for carrying heavy pressures and loads. Its high strength ensures long-term reliability in building structures and foundation work.

Excellent welding characteristics:
Due to its special chemical composition and manufacturing process, ASTM A500 Grade B excels in the welding process. The pipe can be easily adapted to a variety of welding methods, including arc, submerged arc and gas shielded welding, ensuring robustness and quality of welded joints.

Widely used in structural engineering:
The applications of ASTM A500 Grade B are not only limited to general building structures, but also include bridges, pylons, flyovers, tunnels and other different types of structural engineering. Its high strength and corrosion resistance enable it to maintain excellent performance in a variety of harsh environments.

Building frames and support structures:
In the construction sector, ASTM A500 Grade B is widely used in the manufacture of building frames and supporting structures. This includes structural framing in industrial, commercial and residential buildings, where its robustness and reliability provide a solid foundation for building safety.

Piping and Conveying Systems:
Because of its good workability and corrosion resistance, ASTM A500 Gr.B is also often used in the construction of piping and conveying systems, especially in projects that transport liquids, gases, and other media.

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