Product Profile & Structural Strength Advantages
ASTM A500 Grade C defines welded and seamless carbon steel pipes designed for load-bearing applications in construction and industrial projects.
With higher yield strength than Grades A and B, Grade C pipe offers improved stability in compression, bending, and combined stress conditions-making it suitable for columns, bracing, steel structures, and certain piling applications.
Key advantages:
- High structural strength-to-weight efficiency
- Efficient load transfer in welded assemblies
- Reliable fabrication for modular structures
Material Chemistry for Welding and Formability
|
Element |
Max. wt% |
Engineering Purpose |
|
Carbon |
0.26 |
Maintains weldability and avoids cracking |
|
Manganese |
1.35 |
Supports strength and toughness |
|
Phosphorus |
0.035 |
Prevents weld brittleness |
|
Sulfur |
0.035 |
Improves steel cleanliness |
Stable metallurgy ensures consistent weld seam performance.
Mechanical Performance for Structural Safety
|
Property |
Requirement |
Performance Meaning |
|
Yield Strength |
≥ 46 ksi (317 MPa) |
Compressive strength for columns |
|
Tensile Strength |
≥ 62 ksi (427 MPa) |
Overall structural capacity |
|
Elongation |
≥ 23% |
Ductility under fabrication and impact |
These properties support safe deformation under wind, traffic, or operational loads.
Manufacturing Methods & Structural Weld Quality Assurance
ASTM A500 Grade C pipe is primarily produced by electric resistance welding (ERW) or cold-forming into HSS, ensuring consistent shape, strength, and suitability for load-bearing use.
Key manufacturing points:
- ERW seam refinement enhances continuity of stress flow through joints in structural frameworks
- Cold-forming control provides accurate geometry and corner radii for HSS, improving fit-up and alignment on site
- Weld seam inspection (visual + NDE when specified) verifies soundness for fatigue-sensitive or demand-critical members
- Straightness and dimensional tolerance management reduces correction work during erection, ensuring quality installation
Each step is engineered to maintain sectional strength and deliver reliable performance in compression, bending, and combined loading conditions.
Dimensions & Supply Range
|
Shape |
Typical Range |
|
Round Pipe |
1.66" – 28" OD (42 – 711 mm) |
|
Square HSS |
1" – 20" |
|
Rectangular HSS |
1.5" × 1" – 20" × 12" |
|
Wall Thickness |
Up to 0.875" depending on shape |
|
Length |
6–18 m (SRL/DRL or custom) |
Dimensional tolerances follow ASTM A500 mandatory requirements.
Surface Finish & End Protection Options
- Black, bare, or primer-painted surfaces
- Shop-applied coating options for corrosion protection
- End caps or bevels depending on installation needs
- These features protect against handling damage and environmental exposure.
Structural Pipe Applications
- Building columns and bracing members
- Industrial platforms and machinery supports
- Bridge utility and secondary structures
- Signage poles and general steel frameworks
- Rack systems and prefabricated modular units
- Designed for fabrication efficiency and reliable on-site assembly.
Supply Support for Construction & Industrial Projects
Octal Pipe provides ASTM A500 Grade C pipe with documented traceability, weld seam quality records, and fabrication-ready end preparation to support dependable supply into structural and industrial construction projects.
FAQ
Q1: What is ASTM A500 Grade C used for?
Q2: What's the difference between ASTM A500 Grade B and Grade C?
Q3: Is ASTM A500 Grade C "pipe" or "structural tubing (HSS)"?
Q4: Can A500 Grade C be supplied as ERW and seamless?
Certifications
CE Certificate
ISO 9001 Certificate
API Q1 Certificate
ABS Certificate
AP-5L Certificate
API-5CT Certificate
