What is SA709 Grade 100?
SA709 Grade 100 is a high-strength, low-alloy (HSLA) structural steel plate with a minimum yield strength of 100 ksi (≈690 MPa). It is designed for critical structural applications requiring exceptional strength, toughness, and weldability, such as bridges, heavy infrastructure, cranes, and other load-bearing welded components.
Chemical Composition (Typical Maximum Values)
| Element | Content (wt. %) |
|---|---|
| Carbon (C) | ≤ 0.22 |
| Manganese (Mn) | 1.35 max |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
| Silicon (Si) | ≤ 0.50 |
| Vanadium (V) / Columbium (Nb) | ≤ 0.08 (microalloying) |
| Nitrogen (N) | Controlled trace amounts |
Composition is optimized for weldability, toughness, and low-temperature performance.
Mechanical Properties
| Property | Minimum Requirement |
|---|---|
| Yield Strength | 100 ksi (≈690 MPa) |
| Tensile Strength | 110–135 ksi (≈760–930 MPa) |
| Elongation | ≥ 14–16% (varies with thickness) |
| Charpy V-Notch Impact | Meets ASTM A709 low-temperature impact requirements |
| Weldability | Excellent; suitable for heavily welded structures |
| Formability | Good; suitable for bending, rolling, and structural fabrication |
What is the toughness of SA709 Grade 100?
The toughness of SA709 Grade 100 refers to its ability to absorb energy and resist fracture, particularly at low temperatures. It is measured using Charpy V-notch (CVN) impact tests according to ASTM A709 standards.
Typical Toughness Characteristics
| Property | Requirement / Typical Value |
|---|---|
| Charpy V-Notch Impact Energy | 20–30 ft·lb (≈27–41 J) minimum at –50 °F (≈–45 °C) for typical bridge plates, depending on thickness |
| Temperature | Tested at low temperatures to ensure resistance to brittle fracture |
| Welded Joints | Toughness maintained in heat-affected zones (HAZ) for critical welded structures |
Summary:
SA709 Grade 100 has high impact toughness, even at low temperatures, making it suitable for bridges, cranes, trailers, and heavy infrastructure where resistance to brittle fracture is critical. Its combination of high strength and superior toughness ensures safety under extreme loads and cold conditions.
What is SA709 Grade 100 used for?
SA709 Grade 100 is a high-strength, low-alloy structural steel plate with a minimum yield strength of 100 ksi (≈690 MPa). It is primarily used in bridges, heavy infrastructure, and load-bearing welded structures requiring maximum strength and toughness. Common applications include bridge girders, crane components, trailers, and heavy machinery frames. Its combination of high strength, excellent low-temperature toughness, and good weldability makes it ideal for critical structural applications under extreme loads and harsh environments.
GNEE Steel also supplies a variety of high-strength steel plates, such as A514 Grade F, A572 Grade 50, A588 Grade A, S355JR, S690Q, SS400, S690QL, Q345B, Q345E, etc. If you want to know more about other types of steel plates, you can call the consultation hotline at +8615824687445 or send an email to info@gneesteels.com. You are welcome to consult us, and we are very willing to answer your questions.
