Tianjin Brisk Steel is one of the manufacturers of ASTM A500 GR.A ERW Steel Pipe in China. Our products are mainly exported to the Middle East, Southeast Asia, Europe, New Zealand, and other regions.If you would like to learn more about our products, feel free to contact us and send your purchase list.
The Engineering Behind EN 10217 P235TR1
Sourcing the correct structural hollow section requires a precise understanding of the metallurgical and manufacturing parameters defined by the ASTM A500 specification:
- The High-Frequency ERW Forging Process: Our pipes are manufactured by progressively cold-forming high-quality carbon steel strips into a cylindrical profile. The longitudinal seam is continuously fused using High-Frequency Induction (HFI/ERW) currents. This automated process welds the steel edges at a molecular level without the use of filler metals, resulting in a homogenous, clean weld zone that matches the mechanical capability of the pipe body.
- Grade A Mechanical Properties: As the foundational grade within the ASTM A500 framework, Grade A is optimized for structures that prioritize material ductility, ease of forming, and maximum cost-efficiency over high-alloy tensile thresholds. It guarantees a minimum yield strength of 33,000 psi (228 MPa) for round tubes and 39,000 psi (269 MPa) for shaped sections, providing the ideal mechanical backbone for general light-to-medium structural grids.
ERW PROCESS
Technical Specifications
Chemical Composition (Heat Analysis, Max %)
- Carbon: 0.26
- Manganese: 1.35
- Phosphorus: 0.035
- Sulfur: 0.035
- Copper: 0.20 minimum (optional upon request for better atmospheric corrosion resistance)
Mechanical Properties (Round Tube)
- Minimum Tensile Strength: 45,000 psi (310 MPa)
- Minimum Yield Strength: 39,000 psi (269 MPa)
- Minimum Elongation (50mm gauge length): 25%
Available Specifications
- Outside Diameter: 21.3mm – 660mm
- Wall Thickness: 1.65mm – 22mm
- Standard lengths: 6m, 12m, 20ft, 40ft; custom cut lengths are acceptable
- Strict dimensional tolerances comply with ASTM A500 requirements
Surface Condition Options
- Black bare finish (as produced, most popular)
- Anti-rust oiled
- Painted coating
- Hot-dip galvanized upon secondary processing
- Pipe ends: plain ends or chamfered ends
Main Applications
- Light structural frames, fencing, guardrails, billboard supports, machinery bases, greenhouse frames, trailer components, fitness equipment and general construction supports.
- Note: ASTM A500 tubing is designed for structural purposes, NOT recommended for pressure fluid transportation. For heavy-load bearing structures, ASTM A500 Grade B is normally preferred.
Frequently Asked Questions (FAQ)
Q: When should an engineer specify ASTM A500 Grade A over Grade B or Grade C?
A: The primary driver for specifying Grade A is project economy combined with aggressive component workability. While Grade B and Grade C offer higher minimum yield strengths (42,000 psi and 50,000 psi respectively), they are slightly harder and less ductile. For general architectural framing, solar panel mounting frames, scaffolding, material handling racks, and agricultural structures where high-stress loads are not the limiting factor, Grade A provides excellent structural reliability while maximizing your budget.
Q: What strict quality control testing does your mill apply to verify the ERW longitudinal weld seam?
A: To guarantee 100% defect-free structural profiles, our production lines utilize a comprehensive non-destructive testing (NDT) matrix. Immediately following high-frequency welding, the full length of the longitudinal seam undergoes continuous automated Online Eddy Current or Ultrasonic Testing (UT). Additionally, we conduct mandatory physical destructive tests on samples from every production lot, including Flattening Tests and Flaring Tests, to ensure the weld joint handles extreme physical crushing without cracking.
Q: Can ASTM A500 Grade A structural pipes be safely used for pressurized fluid or plumbing networks?
A: No. ASTM A500 is a dedicated structural standard explicitly optimized for load-bearing and mechanical applications. It does not require hydrostatic pressure testing during production. If your project involves transporting internal fluids, steam, or gases under pressure, you must specify pressure-rated piping standards such as ASTM A53 Grade B or API 5L, which include mandatory high-pressure water holding tests.
Q: How does your mill ensure that the outer surface of the pipe remains free from rust and corrosion during multi-week ocean transport?
A: To protect the raw mild steel from high humidity and salt-laden sea air during maritime break-bulk or container transport, we treat 100% of our export pipes with a high-affinity water-resistant anti-rust oil or light black varnish. For maximum longevity in outdoor environments, we highly recommend our factory Hot-Dip Galvanized (HDG) finish, which creates a metallurgical zinc-iron barrier that isolates the steel and prevents oxidation for decades.
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