A514 Grade E is a high-strength, quenched and tempered alloy steel plate covered by ASTM A514, offering a minimum yield strength of 100 ksi, equivalent to 690 MPa. It is used for high-strength structural components such as heavy equipment booms and frames. Because the grade combines high strength with a quenched and tempered structure, there is no single perfect global equivalent; the closest match depends on which property is prioritized for a given application.
A514 Grade E Basics
ASTM A514 covers quenched and tempered alloy steel plates for structural applications. Grade E is one of the grades in the specification, with a minimum yield strength of 100 ksi, and impact testing is required in accordance with the standard. The grade is commonly used for crane booms, heavy equipment frames, and structural members where a high strength-to-weight ratio is required.
Why a Direct Equivalent Is Difficult
An equivalent material should match three characteristics at the same time: a yield strength of about 690 MPa, a quenched and tempered structure, and the specific toughness and corrosion behavior required by the design. Most candidate materials match only one or two of these characteristics, which is why substitution always requires engineering review rather than a simple grade comparison.
Strength and Toughness Equivalents
For matching strength and toughness, the closest European equivalent is S690QL or S690QL1 to EN 10025-6, which provides a 690 MPa minimum yield strength in the quenched and tempered condition with guaranteed low-temperature impact energy. The older ISO 4950-3 Fe 690 designation is an obsolete strength-grade reference. When substituting, the impact test temperature and energy requirements of the project specification must be compared with the EN grade before approval.
Corrosion-Oriented Alternatives
Where atmospheric corrosion resistance is a design priority, ASTM A709 Grade 100W is the closest functional match at the same 100 ksi strength level with weathering characteristics, and is commonly specified for bridges. ASTM A588 Grade K is a standard weathering steel with similar or better corrosion resistance but a lower yield strength of about 50 ksi, so it is used only where the design can be resized for lower strength. These are standard weathering steels and are not interchangeable with plain high-strength grades without design review.
Substitution Guidance
For a component originally designed with A514 Grade E, the safest replacement is often A514 Grade E itself, because the combination of strength, toughness, and corrosion behavior is specific to the grade. Before substituting an alternative, compare minimum yield and tensile requirements, impact testing, weldability, and the corrosion resistance expected in the service environment, and verify the alternative against the applicable design code.
Frequently Asked Questions
What is A514 Grade E steel?
A514 Grade E is a quenched and tempered alloy steel plate covered by ASTM A514, with a minimum yield strength of 100 ksi, equivalent to about 690 MPa.
What is the closest European equivalent to A514 Grade E?
For strength and toughness, the closest European equivalent is S690QL or S690QL1 to EN 10025-6, which matches the 690 MPa yield level and the quenched and tempered condition.
Is A514 Grade E a weathering steel?
No, A514 Grade E is not a full weathering steel. Standard weathering steels such as ASTM A588 or A709 weathering grades provide enhanced atmospheric corrosion resistance and form a protective patina in unpainted exposure.
What is the difference between A514 Grade E and Grade F?
Both are 100 ksi quenched and tempered grades within the same specification, but they have different chemistry requirements; the selection between them depends on the chemical composition and property requirements of the design specification.
Can S690QL replace A514 Grade E?
For strength and toughness it can be considered, but the impact testing, weldability, and corrosion behavior must be verified against the project specification before substitution is approved.
Where is A514 Grade E typically used?
It is used for high-strength structural components such as heavy equipment booms and frames, crane structures, and industrial structures requiring a high strength-to-weight ratio.