ABS Steels
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ABS Steels are types of structural steel which are standardized by the American Bureau of Shipping for use in shipbuilding. [1]
ABS steels come many grades in ordinary-strength and two levels of higher-strength specifications.
All of these steels have been engineered to be optimal long-lived shipbuilding steels. ABS does permit the use of other steels in shipbuilding, but discourages it, and requires more detailed engineering analysis.
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[edit] Basic properties
All ABS steels are standard carbon steels. As with other grades of steel, they have a specific gravity of 7.8.
[edit] Ordinary-Strength
Ordinary-strength ABS shipbuilding steel comes in a number of grades, A, B, D, E, DS, and CS. On certified steels, the plates are marked with the grade and a preceding "AB/", i.e. AB/A etc.
Yield point for all ordinary-strength ABS steels is specified as 34,000 psi (235 MPa), except for ABS A in thicknesses of greater than 1 inch (25 mm) which has yield strength of 32,000 psi (225 MPa), and cold flange rolled sections, which have yield strength of 30,000 psi (205 MPa).
Ultimate tensile strength of ordinary strength alloys is 58,000 - 71,000 psi (400-490 MPa), except for ABS A shapes and bars with 58,000 - 80,000 psi (400-550 MPa), and cold flanged sections with 55,000 - 65,000 psi (380-450 MPa).
The various grades have slightly differing alloy chemical ingredients, and differing fracture toughness.
[edit] Higher-Strength
Higher-strength ABS shipbuilding steel comes in six grades of two strengths, AH32, DH32, EH32, AH36, DH36, and EH36.
The 32 grades have yield strength of 45,500 psi (315 MPa), and ultimate tensile strength of 68,000 - 85,000 psi (475-590 MPa).
The 36 grades have yield strength of 51,000 psi (350 MPa), and ultimate tensile strength of 71,000 - 90,000 psi (495-630 MPa).
[edit] References
- ^ Rules for Building and Classing Steel Vessels, American Bureau of Shipping, 1990
