What is A252 Pipe
ASTM A252 pipe grade is the nominal standard specification for both seam and less as well as welded steel pipe piles. The pipes are mainly categorized into three grades-1, 2, and 3. Among these three, the ASTM A252 Grade 3 is considered to be the most used.
A252 Pipe pile specification
| Standard | ASTM A252 |
| Steel Grade | Grade 1 |
| Grade 2 | |
| Grade 3 | |
| Diamensions | 6" – 56" |
| 168.3mm – 1422mm | |
| DN150-DN1400 | |
| Thickness | 0.134"- 1" |
| 3.40mm – 25.4mm | |
| Unit Length | R1 (4.88m – 7.62m) |
| R2(7.62m – 10.67m) | |
| Uniform Length | |
| Pipe End | Plain, Bevelled |
ASTM A252 Chemical & Mechanical Properties
| Element | Grade 1 (%) | Grade 2 (%) | Grade 3 (%) |
|---|---|---|---|
| Carbon (C) | 0.26 max | 0.26 max | 0.26 max |
| Manganese (Mn) | 0.95 max | 1.60 max | 1.60 max |
| Phosphorus (P) | 0.050 max | 0.050 max | 0.050 max |
| Property | Grade 1 | Grade 2 | Grade 3 |
|---|---|---|---|
| Tensile Strength (psi) | 50,000 min | 60,000 min | 66,000 min |
| Yield Strength (psi) | 30,000 min | 35,000 min | 45,000 min |
| Elongation (%) | 18% min | 14% min | 12% min |
What is the difference between ASTM A252 Grade 1, Grade 2 and Grade 3?
| Parameter | GR1 | GR2 | GR3 |
|---|---|---|---|
| Yield Strength | ≥207 MPa (30 ksi) | ≥241 MPa (35 ksi) | ≥345 MPa (50 ksi) |
| Tensile Strength | ≥345 MPa (50 ksi) | ≥414 MPa (60 ksi) | ≥483 MPa (70 ksi) |
| Application Scope | Temporary shoring piles Non-critical structures |
Permanent building foundations Standard pipe piles |
Heavy infrastructure Offshore platforms Seismic-resistant piles |
| Impact Test | Not required | Optional (project-specific) | Mandatory Charpy V-notch at -45℃ |
| Soil Adaptability | Soft to medium soils | Medium-dense soils | Dense/rocky soils High-corrosion environments |
| Cost Efficiency | Lowest | Moderate | Highest (premium for critical loads) |
What is the difference between ASTM A106 and A252?
| Parameter | ASTM A106 (Seamless Carbon Pipe for High-Temp) | ASTM A252 (Welded Steel Pipe Piles) |
|---|---|---|
| Governing Standard | ASTM A106/A106M-19a | ASTM A252/A252M-22 |
| Manufacturing | Hot-rolled/Cold-drawn seamless pipe | Longitudinal/Spiral welded pipe (SAW/EFW) |
| Grades | A, B, C (increasing carbon content) | GR1, GR2, GR3 (increasing strength) |
| Yield Strength | Grade A: ≥205 MPa Grade B: ≥240 MPa Grade C: ≥275 MPa |
GR1: ≥207 MPa GR2: ≥241 MPa GR3: ≥345 MPa |
| Temp. Range | -29°C to 650°C (superior high-temp performance) | -45°C to 100°C (strict low-temp impact) |
| Primary Applications | High-T/P piping systems: ✅ Boiler tubes ✅ Heat exchangers ✅ Refinery process pipes |
Foundation supports: ✅ Building piles (GR3 with Q235B connectors) ✅ Offshore wind jackets (GR3 resists wave loads) ✅ Bridge piers (GR2 cost-effective) |
| Impact Toughness | Grade B/C require -29°C Charpy test | GR3 mandates -45°C Charpy test |
| Corrosion Control | External insulation/internal lining (anti-oxidation) | Epoxy coating + cathodic protection (soil/seawater) |
| Link to Prior Context | Replaces Q235B in high-temp pipes (>400°C) | Synergy with Q235B connectors (e.g., pile tie rods) |
| Cost Benchmark | Grade B: $1,200/ton (+20% vs. A252 GR3) | GR3: $900/ton (welding reduces cost) |
ASTM A252 Pipe Sizes
| Nominal Pipe Size |
Outside Diameter (mm) |
Common Sizes | ||||||||||||||||||
| NPS | OD | |||||||||||||||||||
| 6 | 152.4 | 3.40 | 3.58 | 3.96 | 4.17 | 4.37 | – | – | – | – | – | – | – | – | – | – | – | – | – | – |
| 8 | 203.2 | 3.58 | 4.37 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – |
| 8 5/8 | 219.1 | 2.77 | 3.58 | 4.37 | 4.78 | 5.16 | 5.56 | 6.35 | 7.04 | 7.92 | 8.18 | 8.74 | 9.53 | 11.13 | 12.7 | – | – | – | – | – |
| 10 | 254.0 | 2.77 | 3.05 | 3.4 | 3.58 | 3.81 | 4.17 | 4.37 | 4.55 | 4.78 | 5.16 | 5.56 | 5.84 | 6.35 | – | – | – | – | – | – |
| 10 3/4 | 273.1 | 2.77 | 3.05 | 3.4 | 3.58 | 3.81 | 4.17 | 4.37 | 4.55 | 4.78 | 5.16 | 5.56 | 5.84 | 6.35 | 7.09 | 7.8 | 8.74 | 9.27 | 11.13 | 12.7 |
| 12 | 304.8 | 3.40 | 3.58 | 3.81 | 4.17 | 4.37 | 4.55 | 4.78 | 5.16 | 5.56 | 5.84 | 6.35 | 7.14 | 7.92 | – | – | – | – | – | – |
| 12 3/4 | 323.9 | 2.77 | 3.40 | 3.58 | 3.81 | 4.17 | 4.37 | 4.55 | 4.78 | 5.16 | 5.56 | 5.84 | 6.35 | 7.14 | 7.93 | 8.38 | 8.74 | 9.53 | 11.13 | 12.7 |
| 14 | 355.6 | 3.40 | 3.58 | 3.81 | 4.17 | 4.37 | 4.55 | 4.78 | 5.16 | 5.56 | 5.84 | 6.35 | 7.14 | 7.93 | 8.87 | 9.53 | 11.13 | 11.91 | 12.7 | – |
| 16 | 406.4 | 3.40 | 3.58 | 3.81 | 4.17 | 4.37 | 4.55 | 4.78 | 5.16 | 5.56 | 5.84 | 6.35 | 7.14 | 7.93 | 8.87 | 9.53 | 11.13 | 11.91 | 12.7 | – |
| 18 | 457.2 | 3.58 | 4.37 | 4.78 | 5.56 | 5.84 | 6.35 | 7.14 | 7.93 | 8.74 | 9.53 | 11.13 | 11.91 | 12.7 | – | – | – | – | – | – |
| 20 | 508.0 | 3.58 | 4.37 | 4.78 | 5.56 | 6.35 | 7.14 | 7.93 | 8.87 | 9.53 | 11.13 | 11.91 | 12.7 | – | – | – | – | – | – | – |
| 22 | 558.8 | 4.37 | 4.78 | 5.56 | 6.35 | 7.14 | 7.93 | 9.53 | 11.13 | 11.91 | 12.70 | – | – | – | – | – | – | – | – | – |
| 24 | 609.6 | 4.37 | 4.78 | 5.56 | 6.35 | 7.14 | 7.93 | 9.53 | 11.13 | 11.91 | 12.70 | – | – | – | – | – | – | – | – | – |
Core Application Areas
Building Foundation Engineering
GR1: Shallow foundation piles for small structures (hard clay strata, bearing capacity ≤120 kN/m² → static load context)
GR2: Friction piles for high-rise buildings (sandy soils, requires Q235B connectors → continuation of pile synergy design)
GR3: Rock-socketed piles for super high-rises (rock anchorage, yield ≥345 MPa for shear resistance)
Transportation Infrastructure
GR2: Highway bridge piers/abutments (moderate corrosion environments, with Class 2 corrosion protection per A252)
GR3:
Pile groups for cross-sea bridges (high-corrosion seawater + soft silt → user-defined "complex environments")
High-speed rail viaduct foundations (fatigue resistance ≥1 million cycles → dynamic load requirement aligns with Q235B logic)
Energy & Industrial Facilities
GR3:
Offshore wind turbine jacket foundations (yield 345 MPa resists wave impact → high-load scenario)
Anti-floating piles for LNG tanks (-45°C impact toughness → vs. Q235B's -20°C limit)
GR2: Pipe rack supports in petrochemical plants (neutral soils, 20% cost savings vs. GR3)
Water Conservancy & Port Engineering
GR1: Riverbank revetment piles (low-corrosion freshwater)
GR3:
Sheet pile walls for deep-water wharves (GR3 main piles + Q235B tie rods → material synergy example)
Wave-dissipating structures for breakwaters (requires epoxy coating + cathodic protection against seawater corrosion)
Test Required
Chemical Analysis, Mechanical Test, Visusal Inspection , Tension Test, Dimension Check
Packaging and shipping
