ASTM A514 Grade Q is a high-yield-strength, quenched and tempered alloy steel plate known for its excellent toughness and weldability in thick sections, making it suitable for structural applications like offshore platforms and heavy machinery. While exact equivalents depend on specific requirements, common international matches include EN 10025-6 S690Q (European), GB/T 16270 Q690E (Chinese), and JIS G3128 SHY685N (Japanese), sharing similar high-strength properties.
Grade Q is part of the ASTM A514/A514M specification, offering a minimum yield strength of 100 ksi (690 MPa) up to 2.5" thick and 90 ksi (620 MPa) for thicker plates up to 8". It is quenched and tempered for enhanced hardness (235-293 HBW) and impact resistance. Equivalents are selected based on similar chemical composition and mechanical properties, though slight differences may exist in alloying or testing.
Equivalent Grades to ASTM A514 Grade Q
|
Standard |
Equivalent Grade |
Notes |
|---|---|---|
|
EN 10025-6 |
S690Q |
European equivalent with min yield 690 MPa; similar toughness. |
|
GB/T 16270 |
Q690E |
Chinese standard; high-strength structural steel with equivalent properties. |
|
JIS G3128 |
SHY685N |
Japanese equivalent for welded structures; comparable strength and weldability. |
|
DIN |
StE690V |
German standard; matches in quench-tempered high-strength category. |
|
ASTM A517 |
Grade Q |
Similar within ASTM family, for pressure vessels but interchangeable in some uses. |
Chemical Composition of ASTM A514 Grade Q
|
Element |
Content (%) |
|---|---|
|
C |
0.14-0.21 |
|
Mn |
0.95-1.30 |
|
P (max) |
0.035 |
|
S (max) |
0.035 |
|
Si |
0.15-0.35 |
|
Ni |
1.20-1.50 |
|
Cr |
1.00-1.50 |
|
Mo |
0.40-0.60 |
|
V |
0.03-0.08 |
|
B |
0.001-0.005 |
Mechanical Properties of ASTM A514 Grade Q
|
Property |
Up to 2-1/2" Thick |
>2-1/2" to 6" Thick |
|---|---|---|
|
Yield Strength (min, ksi/MPa) |
100 / 690 |
90 / 620 |
|
Tensile Strength (ksi/MPa) |
110-130 / 760-895 |
100-130 / 690-895 |
|
Elongation (min, %) |
18 |
16 |
|
Brinell Hardness (HBW) |
235-293 |
235-293 |
Applications and Considerations for Equivalents
A514 Grade Q is used in mining and offshore where equivalents like S690Q provide similar performance.
