ASTM A131 Grade DH32 Shipbuilding Steel Plate

ASTM A131 Grade DH32 Shipbuilding Steel Plate

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Description

Chemical Composition and Mechanical Properties of ASTM A131 Grade DH32

ASTM A131 Grade DH32 is a high-strength structural steel with the following properties:

Property Value
Yield Strength (min) 315 MPa (46 ksi)
Tensile Strength 440-590 MPa (64-85 ksi)
Elongation (min) 22% in 2″, 19% in 8″

Chemical Composition:

Element Percentage
Carbon (max) 0.18%
Manganese 0.90-1.60%
Silicon 0.10-0.50%
Phosphorus (max) 0.035%
Sulfur (max) 0.035%

Applications of ASTM A131 Grade DH32 in Shipbuilding and Offshore Structures

DH32 steel is widely used in:

  1. Ship hull structures
  2. Deck plating
  3. Bulkheads
  4. Mobile offshore drilling units
  5. Marine equipment and components

Its high strength and good low-temperature toughness make it ideal for these applications.

Manufacturing Process and Available Dimensions of DH32 Steel

DH32 steel is typically manufactured as plate steel. Available dimensions include:

  • Thickness: 0.251″ – 1.50″ (6.38 – 38.1 mm)
  • Width: 72″ – 120″ (1800 – 3050 mm)
  • Length: 240″ – 1020″ (6100 – 25910 mm)

Comparison of DH32 with Other ASTM A131 Grades

Grade Yield Strength (min) Impact Test Temperature
AH32 315 MPa 32°F (0°C)
DH32 315 MPa -4°F (-20°C)
EH32 315 MPa -40°F (-40°C)

DH32 offers improved low-temperature toughness compared to AH32, making it suitable for a wider range of operating conditions.

Quality Standards and Testing for ASTM A131 Grade DH32

DH32 undergoes rigorous testing, including:

  1. Tensile strength testing
  2. Chemical composition analysis
  3. Charpy V-notch impact testing (34 J @ -20°C)
  4. Ultrasonic testing for internal defects

At HL Steel Company, we ensure that all our ASTM A131 Grade DH32 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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