Product Name: ASTM A252 Grade 2 / Grade 3 ERW Electric Resistance Welded Black Painted Carbon Steel Pipe
Production Standard: ASTM A252 (American Standard for Welded & Seamless Steel Pipe Piles)
Manufacturing Tech: ERW High-Frequency Electric Resistance Longitudinal Welded
Surface Finish: Uniform Black Anti-Rust Paint Coating (Matte Black, anti-rust for coastal Ecuador humid climate)
Core Application (Ecuador Main Use):
- Civil engineering foundation pipe piling, bridge pier support, retaining wall piling
- Highway, municipal construction, factory building foundation, port & coastal infrastructure (Ecuador Guayaquil, Quito coastal & inland construction projects)
- Underground casing, structure support for local Ecuador real estate & government infrastructure tender projects
Technical Specifications
General Information
| Parameter | Details |
| Standard | ASTM A252 (latest revision) |
| Grade | Grade 2 (GR2), Grade 3 (GR3) |
| Pipe Type | ERW (Electric Resistance Welded) Steel Pipe |
| Manufacturing Process | High-Frequency ERW (HF-ERW) |
| Surface Finish | Black Painting (oxide coating) |
| End Finish | Plain End / Bevel End (optional threaded or grooved) |
| Length | 6m, 12m, or as per customer's requirement |
| Length Tolerance | ± 1% (subject to negotiation) |
| Outer Diameter (OD) | 21.3mm – 660mm (customizable up to larger sizes) |
| Wall Thickness | 1.0mm – 26.97mm (based on grade and requirements) |
| Applicable Standards (Alternative) | API 5L GRB, X42–X70, BS 1387, EN 10219 |
| Test Reports | MTC (Mill Test Certificate), Mechanical Test, Flattening Test, NDT |
Mechanical Properties – Grade 2 vs Grade 3
| Property | ASTM A252 GR2 | ASTM A252 GR3 |
| Minimum Yield Strength | 35,000 psi (240 MPa) | 45,000 psi (310 MPa) |
| Minimum Tensile Strength | 60,000 psi (415 MPa) | 66,000 psi (455 MPa) |
| Elongation (in 2 inches) | ~25% | ~20% |
| Yield Strength Improvement vs GR2 | Baseline | ↑19% |
| Tensile Strength Improvement | Baseline | ↑17% |
| Applicable Pile Depth | ≤40m (medium-shallow layers) | 40–100m+ (deep layers) |
| Typical Cost Premium | Baseline | +15–20% |
Note: Higher grade number = higher mechanical performance. Elongation varies with wall thickness according to ASTM A252 formula E=32t+10 (t in mm)
Chemical Composition (Typical for Grade 3)
| Element | Max Requirement |
| Carbon (C) | ≤ 0.22% |
| Phosphorus (P) | ≤ 0.025% |
| Sulfur (S) | ≤ 0.035% |
Note: ASTM A252 does not specify full chemical composition-mechanical performance governs acceptance. Grade 2 permits slightly higher C and S content.
Applications
Ecuador Market-Specific Applications
Based on 2025 data, Ecuador's steel imports are projected to exceed 1.8 million tons, with welded carbon steel pipes capturing 35% of the market share. Key applications include-25:
Oil & Gas Pipeline Infrastructure: Transport of crude oil and natural gas in the Amazon basin and coastal regions-34
High-Rise Building Foundations: Skyscrapers requiring deep pile foundations (GR3 mandatory for depths >40m)
Bridge Piers and Overpasses: Urban highway bridges, cross-sea bridge foundations
Port and Dock Facilities: Guayas region and coastal infrastructure requiring durable foundation support
Industrial Facilities: Power plants, refineries, chemical plants
Water Conservancy Projects: Riverbank protection, reservoir dams (non-corrosive environments)
Structural Supports and Drill Casings: Secondary applications in general construction
Grade Selection Guide
| Grade | Recommended Applications |
| GR2 | General building foundations (≤30 stories), medium-span bridges, inland water conservancy projects, stable soil conditions |
| GR3 | Super high-rise buildings (100m+ foundations), cross-sea bridges, deep-water ports, seismic zones, challenging/dense soil conditions |
Frequently Asked Questions (FAQ)
Q1: What is the difference between ASTM A252 Grade 2 and Grade 3?
A: Grade 3 offers higher mechanical strength. Grade 2 has a minimum yield strength of 240 MPa and tensile strength of 415 MPa, suitable for general piling projects. Grade 3 delivers 310 MPa yield strength and 455 MPa tensile strength, making it the preferred choice for deep foundations (>40m), high-rise buildings (100m+), cross-sea bridges, and seismic zones. Grade 3 also features improved low-temperature toughness (passes -20°C impact test).
Q2: Why choose ERW (Electric Resistance Welded) instead of seamless pipe?
A: ERW pipes offer several advantages: (1) lower cost than seamless pipes, (2) closer wall thickness tolerances, (3) uniform mechanical properties, and (4) higher production efficiency. For piling applications where extreme pressure is not required, ERW provides the optimal balance of performance and cost-effectiveness.
Q3: What is the function of black painting? Is it sufficient for corrosion protection?
A: Black painting (oxide coating) provides temporary corrosion protection during storage, handling, and transportation. For long-term service in aggressive environments (marine coastal areas, contaminated soils, high-salinity regions like Guayas), additional coating such as epoxy, 3PE, or cathodic protection is recommended.
Q4: What documentation do I need for exporting to Ecuador?
A: For smooth customs clearance in Ecuador, you will need:
Commercial Invoice & Packing List (with RUC tax number of the Ecuador importer)
Bill of Lading (B/L)
Certificate of Origin
Mill Test Certificate (MTC) – bilingual (English/Spanish) with heat number, steel grade, and NTE INEN reference
INEN-1 COC Certificate (Certificate of Conformity) – mandatory for all steel imports
WPS/PQR (Welding Procedure Specification/Qualification Record) – required for welded pipes
Pre-shipment Inspection Report (as required)
We can assist you in preparing all required documentation.
Q5: Can you provide custom pipe dimensions?
A: Yes. We accept custom orders for outer diameter (OD), wall thickness (WT), length (up to 18m or longer), end finishes (plain, beveled, threaded, grooved), and special coatings. Please contact us with your specific requirements.
Q6: What is the typical lead time?
A: Standard production lead time is 15–25 days after deposit confirmation. COC certification (if required for Ecuador) should be initiated 4–8 weeks prior to shipment. Rush orders may be available upon negotiation.
Q7: Do you provide third-party inspection services?
A: Yes. We can arrange third-party inspection by SGS, BV, or other accredited agencies at buyer's request.
Q8: What is your MOQ (Minimum Order Quantity)?
A: Minimum order quantity is typically 5 tons per specification. Smaller quantities may be available upon negotiation.
Q9: Can I visit your factory before placing an order?
A: Absolutely. We welcome customers from around the world to visit our manufacturing facility. Please contact us to schedule an appointment.
Q10: Do you offer free samples?
A: Yes, free samples are available upon request. Please provide your specification requirements for sample preparation. Shipping fees for samples are typically borne by the buyer unless otherwise agreed.
Our address
Rm1406,14th/F No 208, Hongqi Road, Nankai Dist, Tianjin City ,China
Phone Number ( whatsApp/Wechat)
+86 16622033809
alisa@tjshenzhoutong.com
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