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High Strength Structural Steel for Marine Applications
 

AH 36 - DH 36 - EH 36/40 (ABS Certified, MIL-16216)

Overview

These grades used primarily in shipbuilding / repair and other marine applications. The high strength characteristics service the structural requirements of ships, barges, and other types of marine equipment. The EH 40 is utilized for applications which require added strength. ABS certification is normally provided.

Chemical Requirements

ElementChemical CompositionA (heat analysis), % max unless otherwise specified
Grades AH/DH/EH32, AH/DH/EH36 and AH/DH/EH40
Deoxidation
Killed, Fine Grain PracticeB
C 0.18
Mn 0.90-1.60C
Si 0.10-0.50D
P 0.035
S 0.035
Al (acid soluble), minE,F 0.015
CbF 0.02-0.05
VF 0.05-0.10
Ti 0.02
Cu 0.35
Cr 0.20
Ni 0.40
Mo 0.08
N -

AThe contents of any other element intentionally added is to be determined and reported.
BThe steel is to contain at least one of the grain refining elements in sufficient amount to meet the fine grain practice requirement.
CGrade AH 0.5 in. [12.5 mm] and under in thickness may have a minimum manganese content of 0.70%.
DIf the content of soluble aluminum is not less than 0.015%, the minimum required silicon content does not apply.
EThe total aluminum content may be used instead of acid soluble content, in accordance with 7.1.
FThe indicated amount of aluminum, columbium, and vanadium applies if any such element is used singly. If used in combination, the minimum content in 7.2.2 and 7.2.3, as appropriate, will apply.
G0.012 if aluminum is present.

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 %
AH32, DH32, EH32, FH32 64 to 85 [440 to 590] 46 [315] 19 22
AH36, DH36, EH36, FH36 71 to 90 [490 to 620] 51[365] 19 22
AH40, DH40, EH40, FH40 74 to 94 [510 to 650] 57[390] 19 22

AFor nominal thickness or diameter under 5/16 in. [8 mm], a deduction from the specified percentage of elongation in 8 in. [200 mm] shall be made. See elongation requirement adjustments under the Tension Test section of Specifications A6/A6M for deduction values.
BElongation is not required for floor plate.
CFor nominal thickness or diameter over 3.5 in. [90 mm], a deduction from the specified percentage of elongation in 2 in. [50 mm] shall be made. See elongation requirement adjustments under the Tension Test section of Specification A6/A6M for deduction values.
DFor Grade A shapes and bars, the upper limit of tensile strength may be 80 ksi [550 MPa].