Chemical Composition and Mechanical Properties of ASTM A131 Grade D

ASTM A131 Grade D is an ordinary-strength structural steel with the following properties:

Chemical Composition:

Applications of ASTM A131 Grade D in Shipbuilding and Offshore Structures

Grade D steel is commonly used in:

1. Ship hull structures
2. Deck plating
3. Bulkheads
4. Mobile offshore drilling units
5. 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 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:

1. Tensile strength testing
2. Chemical composition analysis
3. Charpy V-notch impact testing (20 ft-lbs @ -4°F for plates up to 2″ thick)
4. 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.