Skip to content 
Description
Chemical Composition and Mechanical Properties of ASTM A131 Grade A
ASTM A131 Grade A is an ordinary-strength structural steel with the following properties:Chemical Composition:
| Element | Percentage |
|---|---|
| Carbon (max) | 0.21% |
| Silicon (max) | 0.35% |
| Manganese (min) | 0.60% |
| Phosphorus (max) | 0.035% |
| Sulfur (max) | 0.035% |
Mechanical Properties:
| Property | Value |
|---|---|
| Yield Strength (min) | 235 MPa (34 ksi) |
| Tensile Strength | 400-520 MPa (58-75 ksi) |
| Elongation (min) | 24% in 2″, 21% in 8″ |
Applications of ASTM A131 Grade A in Shipbuilding
Grade A steel is commonly used in:
- General commercial vessels
- Light marine structural constructions
- Plates, frames, and beams for shipbuilding
- Components requiring moderate strength and durability
Manufacturing Process and Available Dimensions
Grade A steel is typically manufactured as plate steel. Available dimensions include:
- Thickness: 0.1875″ – 3.00″ (4.762 – 76.2 mm)
- Width: 72″ – 129.9″ (1800 – 3299 mm)
- Length: 240″ – 1020″ (6100 – 25910 mm)
Comparison of Grade A 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 A offers good strength and toughness at room temperature, making it suitable for general shipbuilding applications.
Quality Standards and Testing for ASTM A131 Grade A
Grade A undergoes rigorous testing, including:
- Tensile strength testing
- Chemical composition analysis
- Charpy V-notch impact testing (25 ft-lbs @ 68°F for plates 2.001″ – 2.805″ thick)
- Ultrasonic testing for internal defects
At HL Steel Company, we ensure that all our ASTM A131 Grade A steel meets or exceeds these quality standards, providing our customers with reliable and high-performance products for their shipbuilding needs.
Reviews
There are no reviews yet.