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ASTM A500 Grade D is a type of structural steel tubing that is widely used in construction and general structural applications. It is part of the ASTM A500 standard, which covers cold-formed welded and seamless carbon steel structural tubing in various shapes such as round, square, rectangular, and special shapes.
Chemical Composition
The chemical composition of ASTM A500 Grade D steel tubing is designed to provide a balance of strength, weldability, and formability. Key elements include:
Carbon (C): ≤ 0.26%
Manganese (Mn): ≤ 1.35%
Phosphorus (P): ≤ 0.035%
Sulfur (S): ≤ 0.035%
Copper (Cu): ≥ 0.20% (when copper steel is specified)
The composition ensures good mechanical properties and resistance to corrosion in certain environments.
Mechanical Properties
Minimum Yield Strength: 36,000 psi (250 MPa).
Minimum Tensile Strength: 58,000 psi (400 MPa).
Elongation: Varies based on the wall thickness and shape, typically ranging from 18% to 23%.
These properties make it suitable for structural applications requiring high load-bearing capacity.
Manufacturing Process
Cold-Formed: The tubing is formed at room temperature, which enhances its strength and surface finish.
Welded or Seamless: Welded tubing is produced by rolling steel strips and welding the seams, while seamless tubing is formed without welding, offering uniform strength.
Grade D specifically requires heat treatment to achieve its mechanical properties.
Applications
ASTM A500 Grade D is widely used in structural and construction applications, including:
● Building frames and supports
● Bridges and highway structures
● Machinery and equipment frames
● Agricultural and industrial structures
Advantages
High Strength: Suitable for heavy-load applications.
Weldability: Can be easily welded, bolted, or riveted.
Cost-Effective: Provides a balance of performance and affordability.
Versatility: Available in various shapes and sizes for diverse applications.
Comparison With Other Grades
ASTM A500 includes several grades (A, B, C, D), with Grade D offering the highest yield and tensile strength. It is often preferred for applications requiring superior structural performance.
Grade A: Lower strength with a minimum yield strength of 33,000 psi.
Grade B: Medium strength with a minimum yield strength of 42,000 psi.
Grade C: Higher strength with a minimum yield strength of 46,000 psi.
Grade D: Designed for specific applications requiring higher yield strength compared to Grade A and B, but slightly lower than Grade C.
Conclusion
ASTM A500 Grade D is a high-strength, versatile, and cost-effective material widely used in structural applications. Its excellent mechanical properties, weldability, and availability in various shapes and sizes make it a preferred choice for engineers and architects in the construction and manufacturing industries.

ASTM A500 GR.D TUBE

ASTM A500 GR.D TUBE Standard: ASTM A500 Grade: GR.A, GR.B, GR.C, GR.D Outside diameter: 20-660MM Wall Thickness: 1.3-16MM Outside diameter: 20*20-1200*1200MM Wall Thickness: 1.3-50MM Outside diameter: 20*20-1500*1500MM Wall Thickness: 1.2-50MM The Wall Thickness Tolerance: The tolerance is within the standard limits Length: normally 5.8m, 6m, 12m or as your required Surface Treatment: Bare Finish, Painting, Oiling, Galvanization, 3PE, FBE coated......

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