ASTM A709 Grade 50W Corten Steel Pipe

ASTM A709 Grade 50W Corten steel pipe is a high-strength, low-alloy structural steel tube designed primarily for bridge construction and heavy-load infrastructure. Classified under the A709 standard by ASTM, it combines excellent mechanical strength, weldability, and atmospheric corrosion resistance, making it an ideal solution for exposed structural applications.

The “50W” indicates a minimum yield strength of 50 ksi (345 MPa) and weathering steel capability, meaning the material develops a protective oxide layer that resists further rusting—extending service life without the need for painting.

✅ Key Features

• Bridge-Grade Strength – Yield ≥ 50 ksi, suitable for heavy structural loads

• Superior Corrosion Resistance – Designed for long-term outdoor exposure

• Corten Steel Performance – Self-protecting rust layer reduces maintenance

• Excellent Weldability – Suitable for complex fabrications and assemblies

• Compliance with AASHTO – Ideal for highway and transportation projects

🏗 Typical Applications

• Bridge truss systems and pipe structures

• Guardrails, rail posts, and structural handrails

• Exposed tubular supports for transportation infrastructure

• Corten art installations or lighting poles in industrial zones

• Steel architecture requiring long-term atmospheric durability

⚙️ Mechanical Properties

🔬 Chemical Composition Highlights

• Copper (Cu): 0.25–0.40%

• Chromium (Cr): 0.40–0.65%

• Nickel (Ni): 0.40–0.65%

• Phosphorus (P): 0.04–0.15%

• Carbon (C): Low carbon for improved weldability

This composition ensures the steel naturally resists corrosion and is especially effective in industrial, urban, or coastal environments.

📦 Supply & Processing Options

• Pipe Types: Round, square, rectangular

• Surface Options: Mill finish, oiled, pre-weathered

• End Types: Plain, beveled, threaded

• Services: CNC cutting, hole drilling, pre-assembly

• Certification: ASTM A709 / EN10204 3.1 / SGS/BV available

Note: ASTM A709 Gr. 50W is often specified by engineers for DOT projects, railway bridge systems, and structural upgrades where weathering performance and high strength are both required.