Gnee (Tianjin) Multinational Trade Co., Ltd has successfully exported 1198 tons of ASTM A709 Grade 345W steel plates and welded pipes to Vietnam, supplying high-strength, weathering-resistant steel for bridge, highway, and industrial infrastructure projects.
This shipment highlights Gnee's capability to support large-scale engineering projects across Southeast Asia.
Product Overview
Material Standard: ASTM A709 GR.345W, EN 10025-5 equivalent
Material Type: Hot-rolled steel plates (5–50 mm) and welded pipes (OD 100–600 mm)
Surface Treatment: Anti-corrosion oil coating; optional sandblasting for outdoor applications
Key Features:
High yield strength (≥345 MPa) and tensile strength (480–620 MPa)
Excellent toughness and low-temperature impact resistance
Corrosion resistance via weathering steel patina formation
Weldable and formable, suitable for heavy engineering
Advantages:
Reduces long-term maintenance costs due to natural rust layer
Ensures structural safety in bridges, highways, and port facilities
Compatible with tropical and coastal climates in Vietnam
Applications
A709 GR.345W steel plates and welded pipes are applied in critical infrastructure projects, with specific engineering uses:
Bridge Girders and Load-Bearing Columns
Steel plates form primary load-bearing girders, deck plates, and cross beams.
Welded pipes used as hollow columns to reduce weight while maintaining strength.
Material's corrosion resistance ensures longevity in humid environments.
Highway Guardrails and Safety Barriers
Pipes provide impact-resistant supports for roadside guardrails.
Maintains structural integrity under vehicle collision and harsh weather.
Industrial Pipelines and Supports
Steel plates and pipes used in structural frames and pipeline supports in chemical plants and power facilities.
Resistant to environmental corrosion and temperature variations.
Port and Marine Facilities
Supports docks, cranes, and mooring structures.
Weathering steel resists saltwater corrosion and reduces maintenance cycles.
Chemical Composition and Mechanical Properties
Chemical Composition (%):
| Element | C | Mn | Si | P | S | Cu | Cr | Ni |
|---|---|---|---|---|---|---|---|---|
| Content | 0.18 | 1.20 | 0.32 | 0.06 | 0.03 | 0.30 | 0.50 | 0.35 |
Mechanical Properties:
| Property | ASTM Requirement | Gnee Test Result | Remark |
|---|---|---|---|
| Yield Strength | ≥345 MPa | 352–356 MPa | Exceeds standard |
| Tensile Strength | 480–620 MPa | 525 MPa | Uniform across batches |
| Elongation | ≥18% | 21% | Excellent ductility |
| Charpy Impact (–20°C) | ≥27 J | 33 J | Superior low-temperature toughness |
Production Process and Quality Control
Production Steps:
Raw Material Selection: Premium steel billets verified for chemical composition.
Hot Rolling & Forming: Plates and pipes rolled under controlled temperature for uniform structure.
Welding & Heat Treatment: Pipes welded with low-hydrogen electrodes and normalized for toughness.
Surface Treatment: Anti-corrosion oil applied; optional SA 2.5 sandblasting.
Dimensional Inspection: Thickness, OD, straightness checked via laser systems.
Quality Testing:
| Test | Standard | Purpose | Result |
|---|---|---|---|
| Ultrasonic Flaw Detection | ASTM E213 | Detect internal defects | Passed |
| Hydrostatic Test | ASTM A530 | Verify pressure resistance | Passed |
| Flattening/Bending Test | ASTM A370 | Confirm ductility | Passed |
| Coating Thickness | ISO 2178 | Ensure protective layer uniformity | Passed |
| Third-Party Verification | SGS | Confirm compliance | Certified |
Packaging and Logistics
| Item | Details |
|---|---|
| Total Shipment | 1198 tons |
| Packaging | Anti-rust oil + waterproof plastic + steel banding + wooden frames |
| Container Type | 40FT HQ + Bulk cargo |
| Loading Port | Tianjin Xingang, China |
| Destination Port | Hai Phong, Vietnam |
| Transit Time | 14–15 days |
| Monitoring | GPS real-time tracking |
Packaging Notes:
Each pipe and plate bundle labeled with heat number, dimensions, batch code, and gross weight.
Protective wrapping ensures damage-free delivery during long-distance sea transport.
This shipment illustrates Gnee's expertise in delivering high-performance weathering steel for large infrastructure projects. By combining strict quality control, advanced production techniques, and reliable logistics, Gnee ensures structural safety, corrosion resistance, and long-term performance for bridges, highways, and port facilities in Vietnam.
