What Is The Yield Strength Of SA514 Grade F?

SA514 Grade F is a high-yield strength, quenched and tempered alloy steel plate known for its exceptional strength (min 100 ksi yield), toughness, and good weldability, used in heavy-duty structural applications like construction equipment, truck frames, and crane booms, featuring specific alloying elements for enhanced performance and available in various thicknesses.

Key Characteristics

Type: High-Strength Low-Alloy (HSLA) Quenched and Tempered Steel Plate.

Yield Strength: Minimum 100 ksi (690 MPa) for plates up to 2.5 inches thick.

Tensile Strength: Typically 110-130 ksi (760-895 MPa).

Toughness: Excellent low-temperature toughness, often with supplemental Charpy V-notch testing.

Weldability: Good, suitable for demanding structural applications.

Alloying Elements: Contains Nickel, Chromium, Molybdenum, Vanadium, and Copper for strength and properties.

Availability & Standards

Governed by ASTM A514/ASME SA514 specifications, with Grade F being one of several options.

Supplied as plates, often in thicknesses from around 0.185" up to 2.5" (or more depending on thickness), with wider and longer dimensions available.

Chemical composition of Heat analysis for SA514 Grade F quenched and tempered steel plate (Max %)

The minimum yield strength of SA514 Grade F steel is 100 ksi (690 MPa) for material up to 2.5 inches (63.5 mm) in thickness.

However, like most high-strength steels, its guaranteed minimum yield strength decreases as the plate thickness increases due to the physics of heat treatment during manufacturing.

Here are the specific yield strength requirements per the ASTM A514/SA514 standard:

Yield Strength (Minimum) by Thickness - SA514 Grade F

(Note: Some proprietary versions from major mills may maintain higher strength at greater thicknesses.)

Key Related Mechanical Properties (for thickness ≤ 2.5 in / 63.5 mm):

Tensile Strength: 115 - 135 ksi (790 - 930 MPa)

Elongation (in 2 in / 50 mm): 18% minimum

Hardness (Typical): 235 - 293 HBW (approx. 22-30 HRC)

Impact Toughness: Charpy V-notch requirements are typically specified (e.g., 40-50 ft-lbf at -50°F / 54-68 J at -45°C), ensuring excellent fracture resistance.

Critical Design Note:

Engineers must use the yield strength value corresponding to the actual thickness of the plate in their design. Assuming 100 ksi yield for a 5-inch thick plate would be non-conservative and unsafe. The correct value for that thickness would be 85 ksi (585 MPa).

In summary, while SA514 Grade F is famous for its 100 ksi yield strength, this value is only guaranteed for plates up to 2.5 inches thick. For thicker sections, the specified minimum yield strength is progressively lower, as shown in the table above.

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1. What Is SA514 Grade F Steel?

SA514 Grade F is a high-strength, quenched and tempered alloy steel plate used primarily in structural applications requiring extreme toughness and high yield strength, such as crane booms and mining equipment.

2. What Is The Yield Strength Of SA514 Grade F?

SA514 Grade F has a minimum yield strength of 100 ksi (690 MPa) for thicknesses up to 2.5 inches (63.5 mm). For thicker plates, the minimum yield strength decreases.

3. Is SA514 Grade F Weldable?

Yes, SA514 Grade F can be welded, but it requires strict control procedures due to its high hardenability. Preheating, low-hydrogen electrodes, and controlled heat input are mandatory to prevent hydrogen-induced cracking and maintain properties in the heat-affected zone (HAZ).

4. What Is SA514 Grade F Used For?

It is used in highly stressed structural components like crane booms, truck frames for heavy haulers, mining shovel arms, wind turbine towers (high-stress sections), and support structures in military vehicles and heavy machinery.

5. What Is The Difference Between SA514 And AR500 Steel?

SA514 Grade F is a through-hardened, quenched and tempered structural steel designed for load-bearing components. AR500 is an abrasion-resistant steel with a hard, wear-resistant surface, primarily used for liners in mining and material handling, not for primary structural support.

6. What Is The Chemical Composition Of SA514 Grade F?

Its typical composition includes Carbon (~0.15%), Manganese (~0.95%), Silicon (~0.55%), Chromium (~0.85%), Molybdenum (~0.55%), Vanadium (~0.08%), and Boron (0.001-0.005%) to achieve its high strength and hardenability.

7. What Is The Hardness Of SA514 Grade F?

The typical Brinell hardness range for SA514 Grade F is 235-293 HBW (approximately 22-30 HRC). This balances high strength with good toughness.

8. Can SA514 Grade F Be Machined?

Yes, but with difficulty. It is a very hard, strong steel that requires robust machinery, rigid setups, appropriate cutting tools (grade and geometry), ample cooling, and lower speeds/feeds compared to mild steels.

9. What Is The Equivalent Of SA514 Grade F In Europe?

There is no direct, identical European equivalent. The closest grades in terms of high strength and quenched & tempered condition are S690QL (EN 10025-6) or possibly Hardox 600 for wear applications, though their chemistries and exact properties differ.

10. How Does SA514 Grade F Compare To T1 Steel (A514)?

SA514 Grade F is T1 steel. "A514" is the ASTM designation for structural steel, and "SA514" is the ASME code designation for the same material. Grade F is one of the specific sub-grades under this specification.

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.