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0102030405
Cold-Formed Carbon Steel Structural Tubing in China - A500/A500M Suppliers & Factory for Rounds and Shapes
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.
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Frequently Asked Questions
What is ASTM A500/A500M used for?
ASTM A500/A500M covers cold-formed welded and seamless carbon steel structural tubing used in round, square, and rectangular shapes, primarily for structural applications such as buildings, bridges, and construction frameworks.
What are the available grades under ASTM A500?
ASTM A500 includes four grades: Grade A, Grade B, Grade C, and Grade D. Each grade has different minimum yield strength, tensile strength, and elongation requirements. Grade D is limited to rectangular and square tubing only.
What is the difference between ASTM A500 and ASTM A501?
ASTM A500 covers cold-formed tubing with precise dimensional tolerances, while ASTM A501 covers hot-formed structural tubing, which generally offers higher strength but with less precise tolerances. ASTM A1085 is a newer standard offering improved structural properties and toughness.
What testing is required for ASTM A500 tubing?
Required testing includes tensile tests for each heat/lot, flattening tests for welded tubing (Grades A, B, C), and bend tests for Grade D rectangular/square tubing. Optional hydrostatic or non-destructive testing (eddy current or ultrasonic) may also be specified. Visual inspection for surface defects is mandatory.
What documentation is required when purchasing ASTM A500 tubing?
A Mill Test Report (MTR) is required, containing chemical composition and mechanical test data. Each tube must also be marked with the ASTM A500/A500M designation, grade, size, manufacturer's name, and heat number.
What are the wall thickness tolerances for ASTM A500 tubing?
Wall thickness tolerances vary by manufacturing method: seamless tubing allows ±12.5%, while welded tubing allows ±10%. Outside dimensions are held to ±0.5% for round tubing and ±0.75% for shaped tubing. Straightness deviation must not exceed 0.125% of total length.