ASTM A131 Grade AH32

TAGS: ASTM A131 | Grade AH32 | Shipbuilding Steel Plate | Shipbuilding | Shipbuilding Steel |

ASTM A131 Grade AH32

ASTM A131 is a widely recognized academic standard that provides specifications for structural steel used in shipbuilding. From an academic perspective, the description of ASTM A131 can be as follows:

ASTM A131 is a standard specification for structural steel plates, shapes, and bars intended for use in ship construction. The standard encompasses multiple grades of low-carbon, high-strength steel specifically designed for marine applications. These grades include A, B, D, E, AH32, DH32, EH32, AH36, DH36, EH36, AH40, DH40, and EH40.

The specification outlines the chemical composition requirements, mechanical properties, and other relevant characteristics of each grade. The chemical composition typically includes elements such as carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, copper, molybdenum, vanadium, nitrogen, and aluminum. Each element contributes to the steel's properties and performance in terms of strength, weldability, and corrosion resistance.

The mechanical properties specified in ASTM A131 cover parameters like yield strength, tensile strength, elongation, and impact toughness. These values determine the steel's ability to withstand applied loads, deformations, and harsh environments encountered in marine operations.

the standard may require specific testing procedures, such as Charpy V-notch impact testing and notch toughness testing, to assess the material's behavior under different loading conditions. These tests evaluate the steel's ability to absorb energy and resist fracture, ensuring its reliability and safety in service.

ASTM A131 Grade AH32 is a high-strength, low-alloy structural steel specifically designed for shipbuilding applications. Here is a professional description of its chemical composition, physical properties, application, impact testing, notch toughness testing, and ultrasonic testing:

Chemical Composition (Percentage by Weight):

Carbon (C): ≤0.18%

Manganese (Mn): 0.90-1.60%

Phosphorus (P): ≤0.035%

Sulfur (S): ≤0.035%

Silicon (Si): 0.10-0.50%

Nickel (Ni): ≤0.40%

Chromium (Cr): ≤0.20%

Copper (Cu): ≤0.35%

Molybdenum (Mo): ≤0.08%

Vanadium (V): ≤0.05%

Nitrogen (N): ≤0.010%

Aluminum (Al): ≥0.015%

Physical Properties:

Density: 7.85 g/cm³ (0.2836 lb/in³)

Melting Point: 1415-1470°C (2579-2678°F)

Mechanical Properties (Minimum Values at Ambient Temperature):

Yield Strength (Ry): ≥315 MPa (45,700 psi)

Tensile Strength (RT): 440-590 MPa (63,800-85,600 psi)

Elongation (A): ≥22%

Impact Testing:

ASTM A131 Grade AH32 undergoes Charpy V-notch impact testing to measure its ability to absorb energy during rapid deformation. The average Charpy impact energy value should be ≥34 J (25 ft·lbf) at a specified temperature, typically 0°C (32°F).

Notch Toughness Testing:

Notch toughness testing evaluates the material's resistance to brittle fracture under stress concentration at the notch or discontinuity. ASTM A131 Grade AH32 is expected to possess good notch toughness properties, ensuring its capability to resist crack initiation and propagation.

Ultrasonic Testing:

Ultrasonic testing is conducted on ASTM A131 Grade AH32 steel to detect internal defects, such as voids, inclusions, or discontinuities. This non-destructive testing method uses high-frequency sound waves to evaluate the integrity and soundness of the material.

Usage/Application:

ASTM A131 Grade AH32 steel is primarily used in the construction of ships and marine structures requiring high strength and durability. It finds application in the fabrication of hulls, decks, and other structural components for various types of vessels, including naval ships, commercial ships, and offshore platforms. The steel's chemical composition and mechanical properties make it suitable for withstanding harsh marine environments, heavy loads, and impact forces.

Property

Temperature

Value

Comment

Density

23.0 °C

7.8 - 7.9 g/cm³

Show Material materials with Density of 7.8 - 7.9 g/cm³

Typical for Low Carbon Steel

Property

Temperature

Value

Comment

Elastic modulus

23.0 °C

200 - 215 GPa

Show Material materials with Elastic modulus of 200 - 215 GPa

Typical for Low Carbon Steel

Elongation A200

23.0 °C

14 - 22 %

Show Material materials with Elongation A200 of 14 - 22 %

Elongation A50

23.0 °C

20 %

Show Material materials with Elongation A50 of 20 %

Poisson's ratio

23.0 °C

0.29 [-]

Show Material materials with Poisson's ratio of 0.29 [-]

Typical for Low Carbon Steel

Shear modulus

23.0 °C

82 GPa

Show Material materials with Shear modulus of 82 GPa

Typical for Low Carbon Steel

Tensile strength

23.0 °C

440 - 590 MPa

Show Material materials with Tensile strength of 440 - 590 MPa

Yield strength

23.0 °C

315 MPa

Show Material materials with Yield strength of 315 MPa

Property

Temperature

Value

Comment

Coefficient of thermal expansion

23.0 °C

1.32E-5 - 1.38E-5 1/K

Show Material materials with Coefficient of thermal expansion of 1.32E-5 - 1.38E-5 1/K

Typical for Low Carbon Steel

Max service temperature

500 °C

Show Material materials with Max service temperature of 500 °C

Typical for Carbon Steel

Melting point

1480 - 1526 °C

Show Material materials with Melting point of 1480 - 1526 °C

Typical for Low Carbon Steel

Specific heat capacity

23.0 °C

465 J/(kg·K)

Show Material materials with Specific heat capacity of 465 J/(kg·K)

Typical for Low Carbon Steel

Thermal conductivity

23.0 °C

25 - 93 W/(m·K)

Show Material materials with Thermal conductivity of 25 - 93 W/(m·K)

Typical for Low Carbon Steel

Property

Temperature

Value

Comment

Electrical resistivity

23.0 °C

1.43E-7 - 1.74E-7 Ω·m

Show Material materials with Electrical resistivity of 1.43E-7 - 1.74E-7 Ω·m

Typical for Carbon Steel

Property

Value

Comment

Curie temperature

770 °C

Show Material materials with Curie temperature of 770 °C

Typical for Low Carbon Steel

Property

Value

Aluminium

0.015 %

Show Material materials with Aluminium of 0.015 %

Calcium

5E-3 %

Show Material materials with Calcium of 5E-3 %

Carbon

0.18 %

Show Material materials with Carbon of 0.18 %

Chromium

0.2 %

Show Material materials with Chromium of 0.2 %

Copper

0.35 %

Show Material materials with Copper of 0.35 %

Manganese

0.9 - 1.6 %

Show Material materials with Manganese of 0.9 - 1.6 %

Molybdenum

0.08 %

Show Material materials with Molybdenum of 0.08 %

Nickel

0.4 %

Show Material materials with Nickel of 0.4 %

Niobium

0.02 - 0.05 %

Show Material materials with Niobium of 0.02 - 0.05 %

Phosphorus

0.04 %

Show Material materials with Phosphorus of 0.04 %

Silicon

0.1 - 0.5 %

Show Material materials with Silicon of 0.1 - 0.5 %

Sulfur

0.035 %

Show Material materials with Sulfur of 0.035 %

Titanium

0.02 %

Show Material materials with Titanium of 0.02 %

Vanadium

0.05 - 0.1 %

Show Material materials with Vanadium of 0.05 - 0.1 %

Place an order && Inquire