What is A500 steel pipe?
Definition and standard
Structural use: cold-formed welded/seamless carbon steel pipe, implemented in accordance with ASTM A500/A500M, mainly used for load-bearing structures such as building frames and bridge supports.
Grade classification: A, B, C, and D, of which B is the most commonly used (yield strength ≥ 345MPa).
Core characteristics
Mechanical properties
Grade B: yield strength ≥ 345 MPa, tensile strength 420-550 MPa, elongation ≥ 18%;
High-strength design: D requires heat treatment and strengthening (yield strength ≥ 400 MPa).
Process advantages: excellent cold bending and weldability, suitable for complex structural processing.
Typical uses
Building curtain wall keels, machinery manufacturing skeletons; Traffic facility guardrails, heavy-duty shelf supports.
What is A252 steel pipe?
Definition and standard
Pile foundation only: low carbon welded/seamless steel pipe, ASTM A252, dedicated to building pile foundation and underground support structure.
Grade classification: Gr1, Gr2, Gr3, Gr3 yield strength ≥310 MPa.
Core characteristics
Composition design: low carbon (C≤0.26%), low impurities (P/S≤0.045%), optimized welding and soil corrosion resistance;
Mechanical properties:
Gr3 grade: yield strength ≥310 MPa, tensile strength 420-550 MPa, elongation ≥17%.
Typical uses
Deep piles of high-rise buildings, pipe pile systems of port terminals;
Temporary support structures, agricultural greenhouse foundations.
What is the difference between ASTM A500 and A252 pipe
| Comparison Dimensions | A500 steel pipe | A252 steel pipe |
|---|---|---|
| Core Purpose | Above ground load-bearing structure (visible part) | Underground pile foundation support (hidden engineering) |
| Strength design | Higher strength (Grade B ≥ 345 MPa) | Emphasis on toughness (Gr3 ≥ 310 MPa) |
| Ingredient Control | Higher manganese content (B grade Mn ≤ 1.35%) | Low carbon and low impurities (C≤0.26%) |
| Process cost | Mainly cold forming process, high cost | Simplified ingredients, 10-15% lower cost |
| Environmental adaptability | Relying on coating for corrosion protection (outdoor exposure) | Naturally resistant to soil corrosion |
