SA514 Grade F Steel Plate
SA514 Grade F Steel Plate: Comprehensive Profile
SA514 Grade F is a high-strength, quenched and tempered alloy steel plate defined under the ASTM A514 / A514M specification. It is renowned as a "100 ksi yield strength" steel (≥ 690 MPa), offering an exceptional strength-to-weight ratio paired with good toughness.
Quick-Reference Data Sheet
| Category | Specification |
|---|---|
| Standard | ASTM A514 / A514M |
| Type | Alloy Steel, Quenched & Tempered |
| Yield Strength (ReH) | ≥ 690 MPa (≥ 100 ksi) |
| Tensile Strength (Rm) | 790 - 930 MPa (115 - 135 ksi) |
| Key Feature | Boron-treated for deep hardenability in thick plates. |
| Notable Trait | Maintains good toughness at low temperatures. |
1. Chemical Composition about SA514 Grade F (Weight %)
The precise chemistry enables its high performance through heat treatment.
| Element | Range / Limit | Function |
|---|---|---|
| Carbon (C) | 0.15 - 0.21% | Base strength & hardenability |
| Manganese (Mn) | 0.95 - 1.30% | Strength, toughness, hardenability |
| Silicon (Si) | 0.40 - 0.80% | Deoxidizer, strength |
| Chromium (Cr) | 0.40 - 0.65% | Hardenability, wear resistance |
| Molybdenum (Mo) | 0.15 - 0.25% | Hardenability, temper stability |
| Vanadium (V) | 0.03 - 0.08% | Grain refinement, precipitation hardening |
| Boron (B) | 0.001 - 0.003% | Critical: Drastically boosts hardenability |
| Phosphorus (P) | ≤ 0.035% | Impurity control |
| Sulfur (S) | ≤ 0.035% | Impurity control |
Note: The boron content is protected by a small titanium (Ti) addition to ensure effectiveness.
2. Mechanical Properties about SA514 Grade F
Properties are achieved via water quenching and tempering.
Yield Strength
≥ 690 MPa (100 ksi) Primary design value. Tensile Strength 790 - 930 MPa (115-135 ksi) Elongation (in 2") ≥ 18% Good ductility for its strength. Charpy V-Notch Impact ≥ 54 J (40 ft-lbf) @ -40°C (-40°F) Excellent low-temperature toughness.
Thickness Availability: Typically supplied up to 4 inches (100 mm) thick. Thinner plates often have higher yield strengths.
3. Key Advantages & Characteristics about SA514 Grade F
Extreme Strength: 100 ksi yield allows for significant weight reduction in structures.
Good Toughness: Maintains impact resistance down to -40°F/-40°C, suiting it for cold environments.
Through-Thickness Properties: The quench & temper process with boron ensures consistent properties even in thick plates.
Fatigue Resistance: Fine-grained microstructure provides good resistance to cyclic loading.
4. Primary Applications about SA514 Grade F
SA514 Grade F plate is specified for high-stress, weight-critical components:
Heavy Equipment: Excavator booms, loader arms, crane components.
Mining: Shovel buckets, dragline structures.
Transportation: Chassis for heavy-haul trucks, trailer frames.
Construction: Critical connections in bridges (e.g., splice plates), high-rise building components.
Energy: Wind turbine towers (high-stress sections), drilling rig components.
Defense: Armored vehicle parts, structural components.
5. Fabrication Considerations about SA514 Grade F (Critical)
Working with SA514 Grade F requires specialized procedures due to its high strength and hardenability.
| Process | Key Considerations |
|---|---|
| Welding | STRICT PROCEDURES REQUIRED: • Pre-heat & Interpass Temp: Typically 300-400°F (150-200°C). • Filler Metal: Use matching high-strength, low-hydrogen electrodes (e.g., E11018, E12018). • Post-Weld Heat Treatment (PWHT): Often required to relieve stresses (tempering). • Procedure Qualification: Essential before production welding. |
| Cutting | Thermal cutting (plasma, laser) is standard. Oxy-fuel requires care to avoid hardening the cut edge. Pre-heat before flame cutting is recommended for thick plates. |
| Forming | Cold forming is difficult. Hot forming (≥1650°F / 900°C) followed by re-heat-treatment is often necessary for severe bends. |
| Machining | Requires rigid setups, positive rake angles, and carbide tooling. It is significantly harder to machine than mild steel (A36). |
6. Equivalent & Similar Grades about SA514 Grade F
Europe (EN)
S690QL (EN 10025-6) Similar 690 MPa yield, quenched & tempered. Chemistry differs. International Hardox 450 (SSAB) Similar strength, but optimized for abrasion resistance. May have lower toughness. Proprietary AR450 Abrasion-resistant grade; strength similar, but toughness specifications differ. ASTM A709 Grade 100W Bridge steel version with similar properties.
Procurement & Quality Assurance
When ordering SA514 Grade F plate:
Specify the exact standard: ASTM A514 Grade F.
Request Mill Test Reports (MTRs): Essential to verify chemistry, mechanical properties, and impact test results.
Define delivery condition: Typically supplied as quenched and tempered.
Consider supplementary requirements: The ASTM standard offers options for additional testing (e.g., ultrasonic examination, through-thickness tension tests).
Summary
SA514 Grade F steel plate is a premium, high-performance material for engineers who need to save weight without sacrificing structural integrity or toughness. Its use is justified in critical applications where the higher material and fabrication costs are offset by the performance benefits and weight savings in the final structure. Successful use demands respect for its fabrication requirements, particularly regarding welding and heat treatment.
1. What is the yield strength of SA514 Grade F?
SA514 Grade F is defined by its 100 ksi (690 MPa) minimum yield strength. This makes it a true "100 ksi steel," allowing for significant weight reduction in structural components under high stress.
2. What is the primary application of SA514 Grade F?
This steel is extensively used in mining and heavy equipment-such as excavator booms, crane components, and dragline structures-where high strength, toughness, and fatigue resistance are critical for performance and safety.
3. Can SA514 Grade F be welded?
Yes, but it requires strict welding procedures including pre‑heating (300‑400°F), low‑hydrogen electrodes, and often post‑weld heat treatment (PWHT) due to its high hardenability and risk of hydrogen‑induced cracking.
4. Does SA514 Grade F have good low‑temperature toughness?
Yes, it offers excellent toughness at low temperatures, typically requiring a minimum Charpy V‑notch impact value of 54 J (40 ft‑lb) at ‑40°C (‑40°F), making it suitable for cold‑climate applications.
Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staff.
