ASTM A131 Grade DH36 is a high-strength structural steel primarily used in shipbuilding and marine applications. Its key properties and characteristics include:

Chemical Composition and Mechanical Properties

The chemical composition includes a maximum carbon content of 0.18% and manganese content of 0.90-1.60%.

Applications

DH36 steel is widely used in:

1. Shipbuilding (hull structures, deck plating, bulkheads, keels)
2. Offshore structures (oil rig platforms, subsea pipelines)
3. Marine equipment and components

Its high strength and excellent corrosion resistance make it ideal for these applications.

Manufacturing and Available Forms

DH36 is typically manufactured as plate steel, available in the following dimensions:

• Thickness: 0.251″ – 2.00″ (6.38 – 50.8 mm)
• Width: 72″ – 129.9″ (1800 – 3299 mm)
• Length: 240″ – 1020″ (6100 – 25910 mm)

Key Features

1. High strength with minimum yield strength of 355 MPa
2. Good weldability for ease of fabrication
3. Excellent toughness, even at low temperatures
4. Good formability for shaping and bending
5. Corrosion resistance in marine environments

Quality Standards and Testing

DH36 steel undergoes rigorous testing to meet industry standards:

1. Tensile strength testing
2. Chemical composition analysis
3. Charpy V-notch impact testing (25 ft-lbs @ -4°F)
4. Ultrasonic testing for internal defects

ASTM A131 Grade DH36 steel provides a balance of strength, toughness, and corrosion resistance, making it an essential material in the shipbuilding and offshore industries.