High-Strength, Low-Alloy:
ASTM A633 Grade D is considered a high-strength low-alloy (HSLA) steel, meaning it achieves its strength through alloying elements rather than relying solely on carbon content.
Normalized:
It's produced in a normalized condition, which involves heating the steel to a specific temperature and then cooling it in still air. This process refines the grain structure, improving strength and toughness, especially at lower temperatures.
Low-Temperature Service:
A633 Grade D is designed for use in low ambient temperatures, offering better notch toughness than as-rolled steels of comparable strength.
Applications:
Typical applications include construction equipment, offshore support structures, and other structural components where strength and durability are critical, especially in cold climates.
Yield Strength:
A633 Grade D has a minimum yield strength of 345 MPa (50 ksi) for thicknesses up to 2.50 inches (65 mm) and 315 MPa (46 ksi) for thicknesses over 2.50 inches to 4.0 inches (65 to 100 mm).
Chemical composition & Mechanical property
ASTM A633 Grade D/A633 Gr.D structural steel plates chemical composition:
|
Grade |
C |
Si |
Mn |
P |
S |
Cu |
Ni |
Cr |
Mo |
|
A633GR D |
≤0.20 |
0.15-0.50 |
0.70-1.60 |
≤0.035 |
≤0.04 |
≤0.35 |
≤0.25 |
≤0.25 |
≤0.08 |
ASTM A633 Grade D/A633 Gr.D structural steel plates mechanical property:
| Yield Strength |
Tensile Strength |
Elongation in 2 in. |
|
Mpa |
Mpa |
% |
|
≧315 |
450-620 |
≧23 |
Manufacturing:
The steel is produced using a smelting process and is required to meet the fine austenitic grain size requirements of the A6/A6M standard.
Testing:
ASTM A633/A633M requires tension tests and may include Charpy V-notch impact tests to assess notch toughness, especially for specific temperature and location requirements.
