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A-36

Chemical Requirements

Note 1 - Where "-" appears in this table, there is no requirement. The heat analysis for manganese shall be determined and reported as described in the heat analysis section of Specification A6/A6M.

ProductShapesAPlatesBBarsB
Thickness, in. [mm] All To ¾ [20], incl Over ¾ to 1½ [20 to 40], incl Over 1½ to 2½ [40 to 65], incl Over 2½ to 4; [65 to 100], incl Over 4 [100] To ¾ [20], incl Over ¾ to 1½ [20 to 40], incl Over 1½ to 4 [100], incl Over 4 [100]
Carbon, max, % 0.26 0.25 0.25 0.26 0.27 0.29 0.26 0.27 0.28 0.29
Manganese, % - - 0.80-1.20 0.80-1.20 0.85-1.20 0.85-1.20 - 0.60-0.90 0.60-0.90 0.60-0.90
Phosphorus, max, % 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04
Sulfur, max, % 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05
Silicon, % 0.40 max 0.40 max 0.40 max 0.15-0.40 0.15-0.40 0.15-0.40 0.40 max 0.40 max 0.40 max 0.40 max
Copper, min, % when copper steel is specified 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20

aManganese content of 0.85-1.35% and silicon content of 0.15-0.40% is required for shapes with flange thickness over 3 in. [75mm].
BFor each reduction of 0.01 percentage point below the specified carbon maximum, an increase of 0.06 percentage point manganese above the specified maximum will be permitted, up to the maximum of 1.35%.

Tensile Requirements

Plates, Shapes,B and Bars:  
    Tensile strength, ksi [MPa] 58-80 [400-550]
    Yield Point, ksi [MPa] 36 [250]C
Plates and Bars:D,E  
    Elongation in 8 in. [200 mm], min, % 20
    Elongation in 2 in. [50 mm], min, % 23
Shapes:  
    Elongation in 8 in. [200 mm], min, % 20
    Elongation in 2 in. [50 mm], min, % 21B

ASee the Orientation subsection in the Tension Tests section of Specification A6/A6M.
BFor wide flange shapes with flange thickness over 3 in. [75mm], the 80 ksi [550 MPa] maximum tensile strength does not apply and a minimum elongation in 2 in. [50 mm] of 19% applies.
CYield point 32 ksi [MPa] for plates over 8 in. [200 mm] in thickness.
DElongation not required to be determined for floor plate.
EFor plates wider than 24 in. [600 mm], the elongation requirement is reduced two percentage points. See the Elongation Requirement Adjustments subsection under the Tension Tests section of Specification A6/A6M.