Hot Products
- Carbon & Carbon Alloy Steel
- Stainless Steel
- Copper & Nickel Alloy
- Heat Efficiency Tubes
- Pipe Fittings
- Pipe Flanges
- Gasket, Stud Bolt &Nut
- Industrial Valves
0102030405
China Suppliers Factory for ASTM A500/A500M Cold-Formed Welded & Seamless Carbon Steel Structural Tubing
Ordering Information
Buyers must specify the following when placing an order:
- ASTM designation (A500 or A500M)
- Shape (round, square, rectangular, etc.)
- Dimensions (outer diameter, side lengths, wall thickness)
- Grade (A, B, C, or D)
- Length (random or exact)
- Additional requirements (testing, coating, certification)
Main Steel Grades & Mechanical Properties
| Grade | Yield Strength (min) | Tensile Strength (min) | Elongation (%) |
|---|---|---|---|
| A | 39 ksi (270 MPa) | 45 ksi (310 MPa) | 25 (2") |
| B | 46 ksi (320 MPa) | 58 ksi (400 MPa) | 23 (2") |
| C | 50 ksi (345 MPa) | 62 ksi (425 MPa) | 21 (2") |
| D (Rectangular/Square only) | 36 ksi (250 MPa) | 58 ksi (400 MPa) | 23 (2") |
Chemical Composition (Max %)
| Element | Grade A | Grade B | Grade C | Grade D |
|---|---|---|---|---|
| C | 0.26 | 0.26 | 0.23 | 0.20 |
| Mn | — | 1.35 | 1.35 | 1.35 |
| P | 0.035 | 0.035 | 0.035 | 0.035 |
| S | 0.035 | 0.035 | 0.035 | 0.035 |
Inspection & Testing Requirements
- Tensile Test: Required for each heat/lot.
- Flattening Test (Welded Tubing): Mandatory for Grades A, B, C (except seamless).
- Bend Test (Grade D Rectangular/Square): Required.
- Hydrostatic or NDT (Optional): If specified, tubes must be leak-tested (hydrostatic) or examined via eddy current or ultrasonic testing.
- Visual Inspection: Surface must be free of cracks, seams, or excessive imperfections.
Dimensional Tolerances
- Outside Dimensions: ±0.5% (round) or ±0.75% (shapes).
- Wall Thickness: Varies by manufacturing method — seamless: ±12.5%; welded: ±10%.
- Straightness: Max deviation of 0.125% of length.
Marking & Certification
- Marking: Must include ASTM A500/A500M, grade, size, manufacturer's name, and heat number.
- Certification: Mill Test Report (MTR) with chemical/mechanical test data.
🔔 Key Revisions in Latest Edition
- Tighter tolerances for wall thickness in welded tubing.
- Clarified bend test requirements for Grade D.
- Updated referencing standards for testing methods.
🔍 Comparison with Similar Standards
- ASTM A501: Hot-formed tubing (higher strength, less precise tolerances).
- ASTM A1085: Improved structural properties and toughness.
📩 Want to order the same? Contact us Now to send your request!
Frequently Asked Questions
Q What is ASTM A500/A500M used for?
ASTM A500/A500M covers cold-formed welded and seamless carbon steel structural tubing in rounds and shapes. It is widely used in construction, structural frameworks, columns, and mechanical applications where consistent strength and dimensional accuracy are required.
Q What are the differences between Grade A, B, C, and D?
Grades A, B, and C differ primarily in yield and tensile strength — Grade C offers the highest strength (50 ksi yield / 62 ksi tensile). Grade D is specifically for rectangular and square sections and has a lower yield strength (36 ksi) but is suitable for structural applications requiring ductility and formability.
Q What is the wall thickness tolerance for ASTM A500 tubing?
Wall thickness tolerances vary by manufacturing method. For seamless tubing, the tolerance is ±12.5%, while for welded tubing it is ±10%. Outside dimension tolerances are ±0.5% for round sections and ±0.75% for shaped sections.
Q Is a Mill Test Report (MTR) required for ASTM A500 products?
Yes. A Mill Test Report (MTR) is required and must include chemical composition and mechanical test data. Each tube or bundle must also be marked with the ASTM designation, grade, size, manufacturer's name, and heat number for full traceability.
Q How does ASTM A500 compare to ASTM A501 and ASTM A1085?
ASTM A501 covers hot-formed tubing and generally offers higher strength but with less precise dimensional tolerances compared to A500. ASTM A1085 is a newer standard that provides improved structural properties, tighter tolerances, and better toughness, making it preferred for high-performance structural applications.
Q What testing is mandatory for ASTM A500 welded tubing?
For welded tubing, a flattening test is mandatory for Grades A, B, and C. A tensile test is required for each heat or lot. Optional hydrostatic or non-destructive testing (eddy current or ultrasonic) may be specified by the buyer. Visual inspection is always required to ensure surfaces are free of cracks, seams, or excessive imperfections.