ASTM A500 GR.B TUBE

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ASTM A500 Grade B is a widely used structural steel tubing known for its balanced properties. It offers a minimum yield strength of 42,000 psi (290 MPa) and a minimum tensile strength of 58,000 psi (400 MPa), providing sufficient strength for many structural applications. Its good formability and excellent weldability make it easy to fabricate, while its cost-effectiveness and wide availability further contribute to its popularity in construction and industrial projects.

ASTM A500 GR.B TUBE
Manufacture Process: Cold-formed
Outside Diameter:
20MM × 20MM - 1200MM × 1200MM (SHS)
20MM × 30MM - 1000MM × 1500MM (RHS)
Wall Thickness: 1.2MM - 50MM
Length: 1M - 25M, commonly used,5.8M, 6M, 12M. Also depends on the requirements.
Applications: Construction, Marine, Energy, Industrial.
Surface treatment: Galvanizing, Black vanish, Carving, Slightly oil painting, PVC clothes cover each bundle etc.

CLICK HERE➡ASTM A500 GRADE A,B,C,D difference

Chemical Composition(%)
	GR.B
Carbon (C)	for heat analysis≤0.26%
	for product analysis ≤0.30%
Manganese (Mn)	for heat analysis≤1.35%
	for product analysis ≤1.40%
Phosphorus (P)	for heat analysis≤0.035%
	for product analysis ≤0.045%
Sulfur (S)	for heat analysis≤0.035%
	for product analysis ≤0.045%
Copper (Cu)	for heat analysis≥0.20%
	for product analysis ≥0.18%

• Carbon (C): Carbon is a critical element that affects the strength and hardness of steel. In Grade B, the relatively low carbon content ensures good weldability and formability, making it suitable for various structural applications.
• Manganese (Mn):Manganese improves the strength and toughness of steel while also enhancing its resistance to wear and tear. It also helps in reducing the brittleness of the steel.
• Phosphorus (P): Phosphorus is kept at a low level to minimize the risk of brittleness and cracking, especially during welding and forming processes.
• Sulfur (S): Similar to phosphorus, sulfur is controlled to low levels to avoid potential issues such as hot shortness (a condition where the steel becomes brittle and prone to cracking during hot working processes).
• Copper (Cu): Copper can be added to enhance corrosion resistance, especially in environments where the steel may be exposed to harsh conditions. This is an optional requirement and must be specified in the purchase order.

These chemical elements work together to provide Grade B steel with a balance of strength, ductility, and weldability, making it a versatile material for structural applications.

 

 

Mechanical Properties
	Round Structural Tubing	Shaped Structural Tubing
Yield Strength	290MPa(42000psi)	315MPa(46000psi)
Tensile Strength	400MPa(58000psi)	400MPa(58000psi)
Elongation (50mm 2inch)	23.00%	23.00%

ASTM A500 Grade B steel tubing is known for its balanced mechanical properties, making it suitable for a variety of structural applications.These properties ensure that ASTM A500 Grade B can withstand significant loads and pressures while maintaining formability and weldability. The combination of strength and ductility makes it ideal for applications such as building frames, roll cages, truck racks, and other structural components.

• Balanced Formability and Strength：

Grade B offers a good balance between formability and strength. It has a minimum tensile strength of 58,000 psi (400 MPa) and a minimum yield strength of 42,000 psi (290 MPa). This combination of properties makes it suitable for a wide range of structural applications where moderate strength is required but the material still needs to be workable.

• Versatility in Applications：

Due to its balanced properties, Grade B is versatile and can be used in various construction and industrial projects. It is commonly used in building frames, bridges, and other structural applications where reliable performance is needed but the highest strength is not always necessary. This versatility makes it a preferred choice for many engineers and designers.

• Good Weldability：

ASTM A500 Grade B steel tubing has excellent weldability, which is crucial for many construction and fabrication processes. Its controlled carbon and manganese content ensure that it can be easily welded without significant risk of cracking or other welding defects. This makes it easier to work with and reduces the time and cost associated with fabrication.

• Good Formability：

Grade B steel tubing is easy to form, cut, and machine, making it suitable for various fabrication processes. This formability allows it to be used in applications that require bending or other shaping operations.

• Cost-effectiveness：

Compared to higher grades like Grade C and D, Grade B is generally more cost-effective while still providing sufficient strength for many applications. This makes it an economical choice for projects where the highest strength is not required, allowing for cost savings without compromising structural integrity.

• Availability：

Grade B is widely available in the market, which is another reason for its popularity. Its common use means that it is readily stocked by suppliers, ensuring that it can be easily sourced for projects without long lead times. This availability is particularly important for large-scale construction projects where timely material delivery is critical.

In summary, Grade B is the most commonly used steel grade in ASTM A500 due to its balanced mechanical properties, excellent weldability, versatility in applications, cost-effectiveness, wide availability, and good formability. These characteristics make it a reliable and efficient choice for a wide range of structural applications.