What is equivalent to A514 Grade E?
A514 Grade E is a high-strength, quenched and tempered alloy steel within the ASTM A514 specification, offering a minimum yield strength of 100 ksi (690 MPa). Its defining characteristic is enhanced atmospheric corrosion resistance (approximately twice that of carbon steel), achieved through a specific chemistry with higher Molybdenum content. This makes it suitable for high-strength structural components, like heavy equipment booms or frames, that face outdoor exposure where some extra corrosion resistance is beneficial, but where a full weathering steel system is not required.
There is no single, perfect global equivalent to A514 Grade E because it combines three specific properties: 100 ksi (690 MPa) yield strength, quenched & tempered (Q&T) structure, and enhanced atmospheric corrosion resistance. The closest equivalents depend on which property is prioritized.
Closest Equivalents by Region/Standard
| Region / Standard | Closest Equivalent(s) | Key Comparison Notes |
|---|---|---|
| Europe (EN) | S690QL / S690QL1 (EN 10025-6) | Matches 690 MPa strength and Q&T process. Does NOT provide the enhanced corrosion resistance of Grade E. |
| International (ISO) | Fe 690 (ISO 4950) | Obsolete strength-grade reference. |
| ASTM - For Strength & Corrosion | A709 Grade 100W | Similar 100 ksi strength, Q&T, and superior weathering resistance (4–6× carbon steel). The bridge-specific version. |
| ASTM - For Corrosion Only | A588 Grade K (Plate) | Provides similar or better corrosion resistance but at lower strength (50 ksi yield). |
| Proprietary / Brand | Hardox 450 / 500 (SSAB) | Matches hardness/strength, but these are abrasion-resistant steels, not optimized for structural toughness or atmospheric corrosion. |
Critical Analysis: The Challenge of a True Equivalent
A514 Grade E is a niche product because it balances:
1.1Very High Strength: 100 ksi (690 MPa) yield
2.High Toughness: Mandatory impact testing at -40°F/-40°C
3.Moderate Corrosion Resistance: ~2× carbon steel (via higher Molybdenum)
Most equivalents match only one or two of these traits.
1. If Matching STRENGTH & TOUGHNESS is Primary
Use: EN S690QL / S690QL1
Why: Standard European 690 MPa Q&T structural steel with guaranteed toughness.
Trade-off: You lose the enhanced corrosion resistance.
2. If Matching STRENGTH & CORROSION RESISTANCE is Primary
Use: ASTM A709 Grade 100W
Why: This is the closest functional match. Same 100 ksi strength and a true weathering steel with better corrosion resistance (4–6× carbon steel) than Grade E.
Note: A709 Grade 100W is prescribed for bridges and is a more common specification for exposed high-strength steel.
3. If Matching CORROSION RESISTANCE is Primary (and Lower Strength is Acceptable)
Use: ASTM A588 Grade K (Plates)
Why: The standard 50 ksi yield weathering steel. If the design can be resized for lower strength, this is a common, cost-effective substitute for exposed structures.
Trade-off: You lose half the strength.
Why A514 Grade E Itself is Often the Best "Equivalent"
For a component originally designed with A514 Grade E, the safest replacement is often A514 Grade E itself, because:
Its specific corrosion resistance level (2× carbon steel) is unique.
Substituting with a true weathering steel (like A709-100W) may lead to over-design or different galvanic/corrosion behavior in mixed-material assemblies.
Substituting with a plain high-strength steel (like S690QL) loses the corrosion benefit.
1. What is the key chemical difference that defines A514 Grade E?
A514 Grade E is distinguished by its elevated Molybdenum (Mo) content (0.20-0.30%), which provides enhanced atmospheric corrosion resistance (approximately 2× that of carbon steel) while maintaining the 100 ksi yield strength of the A514 family.
2. Is A514 Grade E considered a true weathering steel like A588?
No, it is not a full weathering steel. While it offers improved corrosion resistance (~2× carbon steel), true weathering steels like A588 or A709W provide 4–6× resistance and form a stable, self-protecting patina for fully unpainted exposure.
3. What is the primary application niche for A514 Grade E?
It is used for high-strength structural components exposed to outdoor environments but not requiring a painted or full weathering system, such as heavy equipment booms, frames, and industrial structures subject to moderate atmospheric conditions.
4. How does A514 Grade E compare to A514 Grade F in terms of availability?
A514 Grade E is less common and more specialized than Grade F. Grade F is the standard, widely available 100 ksi Q&T steel, while Grade E is specified only when its enhanced corrosion resistance is a required design feature.
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.
