A709 Series | Structural Steel for Bridge
A709 Series | Structural Steel for Bridge
SteelPRO Group provides ASTM A709 series structural steel plates for bridges in stock.
Standards: ASTM A709/A709M
Grades: 36, 50, 50W, HPS 50W, HPS 70W
Material: High-Strength Low-Alloy Steel (HSLA)
Thickness: 6-150 mm, or customized
Width: 900-4800 mm, or customized
Length: 3000-25000 mm, or customized
Shape: Plate, Profile (Beam, Angle, Channel), Pipe, Bar, or as request
Condition of Delivery: N/HR/A/T/Q+T/TMCP, or as requested
Stock: In stock
Origin: Hubei/Henan/Jiangsu, China
Port: Qingdao, Tianjin, Lianyungang
Description
What Is A709?
A709 series steel is a high-strength, low-alloy steel primarily used in structural applications, especially in bridges. It mainly consists of carbon, manganese, and silicon, which enhance strength and toughness. Common grades include A709 Grade 36, 50, 50W, and HPS 70W. The key feature of A709 series steel is its excellent resistance to weathering and corrosion, especially in harsh outdoor environments. It also offers high weldability and durability. Typical applications include bridge construction, infrastructure projects, and structural components in highways and railways.
Characteristics of A709 Series Steel
- Strong and durable for heavy structures.
- Excellent resistance to weather and corrosion.
- High impact toughness for safety in extreme conditions.
- Good weldability for easier fabrication.
- Available in various grades to suit different needs.
Chemical Compositions
| Grade | C | Si | Mn | P | S | Cr | Ni | Cu | Mo | N | V | Nb | Al | |
| A709 Grade 36 | ≤0.26 | ≤0.04 | – | ≤0.04 | ≤0.05 | – | – | ≤0.2 | – | – | – | – | – | |
| A709 Grade 50 | ≤0.23 | ≤0.4 | ≤1.35 | ≤0.03 | ≤0.03 | – | – | ≤0.2 | – | – | – | – | – | |
| A709 Grade 50W | Type A | ≤0.19 | 0.3-0.65 | 0.8-1.25 | ≤0.03 | ≤0.03 | 0.4-0.65 | ≤0.4 | 0.25-0.4 | – | – | 0.02-0.1 | – | – |
| Type B | ≤0.2 | 0.15-0.5 | 0.75-1.35 | ≤0.03 | ≤0.03 | 0.4-0.7 | ≤0.5 | 0.2-0.4 | – | – | 0.01-0.1 | – | – | |
| A709 Grade HPS 50W | ≤0.11 | 0.3-0.5 | 1.1-1.5 | ≤0.02 | ≤0.006 | 0.45-0.7 | 0.25-0.4 | 0.25-0.4 | 0.02-0.08 | ≤0.015 | 0.04-0.08 | 0.01-0.04 | ||
| A709 Grade HPS 100W | ≤0.08 | 0.15-0.35 | 0.95-1.5 | ≤0.015 | ≤0.006 | 0.4-0.65 | 0.65-0.9 | 0.9-1.2 | 0.4-0.65 | ≤0.015 | 0.04-0.08 | ≤0.03 | 0.01-0.05 | |
*Both table data according to ASTM A709/A709M-2017.
Physical Properties
| Property | Metric Unit | Imperial Unit |
|---|---|---|
| Density | 7.85 g/cm³ | 0.284 lb/in³ |
| Melting Point | 1450°C – 1520°C | 2642°F – 2768°F |
| Thermal Conductivity | 43.3 W/m·°C | 300 BTU·in/hr·ft²·°F |
| Electrical Conductivity | 3% IACS | 3% IACS |
| Specific Heat Capacity | 486 J/kg·°C | 0.116 BTU/lb·°F |
| Thermal Expansion Coefficient | 12.0 x 10⁻⁶ /°C (20-100°C) | 6.7 x 10⁻⁶ /°F (70-212°F) |
| Electrical Resistivity | 0.69 µΩ·m | 27.2 µΩ·in |
Mechanical Properties
| Grade | Thickness (t, mm) | Tensile Strength (σb, MPa) | Yield Strength (σs, MPa) | Elongation (δ, %) |
| A709 Grade 36 | Sheet, Plate t≤100mm | 400~550 | ≥250 | ≥23 (in 50mm) |
| A709 Grade 50 | ≥450 | ≥345 | ≥21 (in 50mm) | |
| A709 Grade 50W | ≥485 | ≥345 | ≥21 (in 50mm) | |
| A709 Grade HPS 50W | ≥485 | ≥345 | ≥21 (in 50mm) | |
| A709 Grade HPS 100W | 760~895 | ≥690 | ≥18 (in 50mm) |
*According to ASTM A709/A709M-2017.
Industries & Applications
| Industry | Application |
|---|---|
| Bridge Construction | Bridge girders, Deck plates, Bearing plates, Bridge trusses |
| Marine Engineering | Ship hulls, Offshore platforms, Dock components, Piers |
| Transportation Infrastructure | Railway tracks, Guardrails, Highway bridges, Overpasses |
| Structural Engineering | Columns, Beams, Trusses, Brackets |
| Heavy Equipment | Cranes, Loaders, Bulldozers, Excavator arms |
Machining
Heat Treatment
- Normalizing: Heat to 900-950°C (1652-1742°F) and air cool. This process improves toughness.
- Quenching and Tempering: Heat to 890-940°C (1634-1724°F) and quench in water or oil, followed by tempering at 620-680°C (1148-1256°F) to achieve the desired mechanical properties.
- Stress Relieving: After welding or forming, heat to 540-600°C (1004-1112°F) to reduce residual stresses.
Surface Finish
- Hot-Dip Galvanizing: Coating with zinc for corrosion resistance.
- Shop Priming: Applying a primer coat before delivery to enhance corrosion protection.
- Paint Coating: Applying protective paint systems to improve durability and aesthetics.
- Mechanical Cleaning: Techniques like sandblasting to remove rust and scale before further treatments.
- Passivation: Chemical treatment to enhance the corrosion resistance of stainless steel grades.
*Customization is available upon request.
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