Difference between A514 Grade C and A514 Grade E

Both A514 Grade C and A514 Grade E are quenched and tempered (Q&T) alloy steel plates conforming to ASTM A514/A514M, a specification for high-yield-strength structural steel used in welded applications and heavy machinery . All grades under this standard share identical mechanical properties to ensure uniform design parameters, but differ significantly in chemical composition, thickness availability, and alloying strategies .

Key Differences:

Alloy System: Grade E contains 1.40-2.00% Cr and 0.40-0.60% Mo, versus Grade C's minimal Cr (≤0.30%) and lower Mo (0.15-0.30%). Grade E also permits titanium, which Grade C lacks .

Thickness Capability: Grade E is certified up to 150 mm, making it suitable for ultra-heavy plates; Grade C is generally limited to 32 mm maximum .

Hardenability: Grade E's rich Cr-Mo composition delivers deeper and more uniform hardening through the Q&T process, essential for maintaining strength in thick sections .

Application Focus: Grade C is economical for moderate-strength, moderate-section components. Grade E is specified for heavy-section, high-load structures such as offshore platforms, Arctic-grade equipment, large crane booms, and thick-walled pressure vessels where through-thickness properties are critical.

Chemical Composition of A514 Grade C

Chemical Composition of A514 Grade E

Mechanical Properties of ASTM A514 Grade C

Mechanical Properties of ASTM A514 Grade E