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Description
Chemical Composition and Mechanical Properties of ASTM A131 Grade D
ASTM A131 Grade D is an ordinary-strength structural steel with the following properties:
| Property | Value |
|---|---|
| Yield Strength (min) | 235 MPa (34 ksi) |
| Tensile Strength | 400-520 MPa (58-75 ksi) |
| Elongation (min) | 21% in 8″, 24% in 2″ |
Chemical Composition:
| Element | Percentage |
|---|---|
| Carbon (max) | 0.21% |
| Silicon | 0.10-0.35% |
| Manganese (min) | 0.60% |
| Phosphorus (max) | 0.035% |
| Sulfur (max) | 0.035% |
Applications of ASTM A131 Grade D in Shipbuilding and Offshore Structures
Grade D steel is commonly used in:
- Ship hull structures
- Deck plating
- Bulkheads
- Mobile offshore drilling units
- Marine equipment and components
Its moderate strength and good welding performance make it suitable for various marine structural applications.
Manufacturing Process and Available Dimensions of Grade D Steel
Grade D steel is typically manufactured as plate steel. Available dimensions include:
- Thickness: 0.1875″ – 3.94″ (4.762 – 100 mm)
- Width: 72″ – 129.9″ (1800 – 3299 mm)
- Length: 240″ – 1020″ (6100 – 25910 mm)
Comparison of Grade D with Other ASTM A131 Grades
| Grade | Yield Strength (min) | Impact Test Temperature |
|---|---|---|
| A | 235 MPa | 68°F (20°C) |
| B | 235 MPa | 32°F (0°C) |
| D | 235 MPa | -4°F (-20°C) |
| E | 235 MPa | -40°F (-40°C) |
Grade D offers improved low-temperature toughness compared to Grades A and B, making it suitable for a wider range of operating conditions.
Quality Standards and Testing for ASTM A131 Grade D
Grade D undergoes rigorous testing, including:
- Tensile strength testing
- Chemical composition analysis
- Charpy V-notch impact testing (20 ft-lbs @ -4°F for plates up to 2″ thick)
- Ultrasonic testing for internal defects
At HL Steel Company, we ensure that all our ASTM A131 Grade D steel meets or exceeds these quality standards, providing our customers with reliable and high-performance products for their shipbuilding and offshore structural needs.
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