Gnee (Tianjin) Multinational Trade Co., Ltd has successfully exported 1198 tons of ASTM A709 Grade 345W steel plates and welded pipes to Vietnam, supporting major bridge and highway projects.
This shipment showcases Gnee's capacity to provide high-strength, weathering-resistant steel for critical infrastructure with strict safety and durability requirements.
The exported material conforms to ASTM A709 GR.345W, equivalent to EN 10025-5, and includes steel plates with thickness 5–50 mm, width 1000–2500 mm, length 3000–18000 mm, and welded pipes with OD 150–600 mm, wall thickness 6–25 mm, length 3000–12000 mm.
Plates feature a hot-rolled finish with anti-corrosion oil coating, while pipes have optional SA 2.5 sandblasting for marine or outdoor applications.
The material combines high yield strength (≥345 MPa), tensile strength (480–620 MPa), elongation (≥18%), and Charpy impact toughness (≥27 J at –20°C), providing excellent performance for load-bearing structures, low-temperature environments, and dynamic loads.
Chemical Composition (%):
| Element | C | Mn | Si | P | S | Cu | Cr | Ni |
|---|---|---|---|---|---|---|---|---|
| Content | 0.17 | 1.18 | 0.31 | 0.06 | 0.03 | 0.32 | 0.48 | 0.34 |
Mechanical Properties:
| Property | ASTM Requirement | Gnee Test Result | Remark |
|---|---|---|---|
| Yield Strength | ≥345 MPa | 355–358 MPa | Exceeds standard |
| Tensile Strength | 480–620 MPa | 530 MPa | Stable performance |
| Elongation | ≥18% | 21% | Excellent ductility |
| Charpy Impact (–20°C) | ≥27 J | 34 J |
Superior low-temperature toughness |
Applications
A709 GR.345W steel plates and welded pipes are applied in key structural and safety components for bridges and highways:
Bridge Girders and Deck Plates
Steel plates form primary load-bearing girders, cross beams, and deck plates.
Welded pipes are used as hollow columns and stiffening members, reducing weight while maintaining strength.
Weathering steel ensures long-term corrosion resistance in coastal and riverine environments.
Highway Guardrails and Safety Barriers
Welded pipes provide impact-resistant support posts for roadside guardrails.
Ensures stability during vehicle collisions and exposure to harsh weather.
Cable Conduits and Service Platforms
Pipes act as supports for electrical cables, lighting poles, and safety walkways.
Maintains dimensional stability under vibration and temperature variations.
Stormwater and Drainage Systems
Plates and pipes form drainage channels, culverts, and stormwater support structures.
High corrosion resistance and mechanical performance ensure long service life with minimal maintenance.
Packaging and Logistics
| Item | Details |
|---|---|
| Total Weight | 1198 tons |
| Packaging | Anti-rust oil + waterproof plastic + steel banding + wooden frames |
| Container Type | 40FT HQ + bulk shipment |
| Loading Port | Tianjin Xingang, China |
| Destination Port | Hai Phong, Vietnam |
| Transit Time | 14–15 days |
| Monitoring | GPS real-time shipment tracking |