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ASTM A514 Grade Q is a high-yield-strength, quenched and tempered alloy steel plate under the ASTM A514/A514M standard, designed for structural applications requiring superior toughness and weldability in thick sections.
It is classified as a high-strength low-alloy (HSLA) material, suitable for welding and used in environments like offshore platforms, mining equipment, and heavy construction where high load-bearing capacity is essential.As a leading manufacturer and exporter, Gangsteel produces premium astm a514 grade q plates, ensuring full compliance with ASTM specifications through advanced heat treatment and testing.
Grade Q is one of the higher-thickness variants in the A514 family, available in thicknesses from 3/16" to 8" (though commonly up to 6"), with a minimum yield strength of 100 ksi (690 MPa) up to 2.5" thick and 90 ksi (620 MPa) for thicker plates. It is quenched and tempered to achieve a Brinell hardness of 235-293 HBW, providing excellent resistance to abrasion and impact. Gangsteel's ASTM A514/A514M steel plate includes Grade Q for projects needing robust performance in thick-plate configurations.
The chemical composition is tightly controlled to ensure hardenability and strength. Below is the typical composition (in weight %, heat analysis) per ASTM specifications:
|
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 |
Note: Values are maximum unless a range is specified. Gangsteel's production maintains these limits for consistent quality.
Mechanical properties vary by thickness, with high tensile and yield strengths. The table below summarizes requirements:
|
Thickness Range |
Minimum Yield Strength (ksi/MPa) |
Tensile Strength (ksi/MPa) |
Minimum Elongation in 8" (%) |
Brinell Hardness (HBW) |
|---|---|---|---|---|
|
Up to 2-1/2" |
100 / 690 |
110-130 / 760-895 |
18 |
235-293 |
|
>2-1/2" to 6" |
90 / 620 |
100-130 / 690-895 |
16 |
235-293 |
|
>6" to 8" (limited) |
90 / 620 |
100-130 / 690-895 |
16 |
235-293 |
Gangsteel's Grade Q plates meet or exceed these specs through precise quenching and tempering.
ASTM A514 Grade Q must be quenched and tempered: austenitized at a minimum of 1650°F (900°C), quenched in water or oil, and tempered at no less than 1150°F (620°C). This ensures the required hardness and strength. Welding requires low-hydrogen processes and preheating (e.g., 300°F for thick plates). Gangsteel's advanced facilities guarantee consistent heat treatment.
Grade Q is ideal for thick-plate applications like offshore drilling rigs, mining equipment, and structural components where high strength and impact resistance are needed. Gangsteel's plates support these with reliable availability.
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