| Feature | ASTM A106 | ASTM A252 |
|---|---|---|
| Type / Standard | Seamless carbon steel pipe for high-temperature service | Welded or seamless steel pipe for structural/piling use |
| Grades / Carbon Content | Grade A: 0.25% C Grade B: 0.30% C Grade C: 0.35% C | Grade 1, 2, 3 (chemical composition similar; P ≤ 0.050%) |
| Mechanical Properties | Yield strength and tensile strength increase with grade; ductility decreases with higher grade | Grade 1: YS 205 MPa, TS 345 MPa, Elongation 30% Grade 2: YS 240 MPa, TS 415 MPa, Elongation 25% Grade 3: YS 310 MPa, TS 455 MPa, Elongation 20% |
| Applicable Environment | Medium to high temperature service: petroleum refining, thermal power, chemical plants | Heavy-load structural applications: pile foundations, bridges, offshore platforms, industrial structures |
| Production Process | Seamless only, hot finished or cold drawn | Seamless or welded (ERW, LSAW, SSAW, EFW, DSAW, spiral weld) |
| Corrosion Resistance | Moderate, suitable for high-temperature service | Good, suitable for outdoor and structural applications; can withstand harsh environments |
| Primary Application | High-temperature pipelines carrying steam, oil, gas | Structural steel pipe piles, load-bearing foundations, cast-in-place concrete shells |
Key Differences
Purpose:
A106: Designed for high-temperature fluid transport.
A252: Designed for structural and piling applications.
Mechanical Requirements:
A106 focuses on tensile and yield strength suitable for elevated temperatures.
A252 focuses on structural strength, load-bearing capacity, and elongation for pile stability.
Manufacturing Method:
A106: Seamless only.
A252: Seamless or welded; supports multiple welding methods.
Environment:
A106: High-temperature pipelines.
A252: Structural and industrial foundations, outdoor environments, heavy loads.
