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Structural Steel for Marine Applications

A 131 ABS Grade A


Used primarily in structural applications in marine / shipping industry for barges, ships, small vessels, support structures and various type of equipment.

Chemical Requirements

ElementChemical CompositionA (heat analysis), % max unless otherwise specified
Grades A
Deoxidation and Thickness (t), in. [mm]
Killed or Semi-Killed t ≤ 2.0 in. [50 mm], Killed t ≥ 2.0 in. [50 mm]
C 0.21C
Mn, min 2.5 x C
Si 0.50D
P 0.035
S 0.035
Ni E
Cr E
Mo E
Cu E
C + Mn/6 0.40

AIntentionally added elements are to be determined and reported.
CA maximum carbon content of 0.23% is acceptable for Grade A shapes and bars.
EThe content of nickel, chromium, molybdenum, and copper are to be determined and reported. When the amount does not exceed 0.02%, these elements may be reported as ≤ 0.02%.

Tensile Requirements

GradeTensile Strength,
ksi [MPa]
Yeild Point, min
ksi [MPa]
Elongation in 8 in. [200 mm]A,B, min %Elongation in 2 in. [50 mm]B,C, min %
A, B, D, E 58 TO 75 [400 to 520] 34 [235] 21 24

DFor Grade A shapes and bars, the upper limit of tensile strength may be 80 ksi [550 MPa].