ASTM A131/A131M Grade AH32 Shipbuilding Steel Plate

ASTM A131 Grades AH32 and DH32 are higher-strength structural steels with a minimum specified yield strength of 46 ksi and specified minimum Charpy V-notch impact toughness properties. ASTM A131 is a specification for shipbuilding steel. ASTM A131 steel comes in 12 grades of 3 strengths: normal strength, high strength and extra high strength shipbuilding steel. ASTM A131 AH32 steel is one of the high-strength ASTM A131 shipbuilding steels. The shipbuilding steel always needs classification society certification. There are a lot of classification societies in the world, and there are 10 main classification societies: ABS, LR, DNV GL, CCS, RINA, BV, NK, KR, RMRS. While DNV GL are mixed into one now.

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.

ASTM A131/ A131M Grade AH32 Shipbuilding Steel Plate Supplier

The main shipbuilding steel grades of GNEE Steel are grade A, B, D, E, AH32, DH32, EH32, FH32, AH36, DH36, EH36, FH36, AH40, DH40, EH40, FH40, etc.