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High Strength, Low Alloy Steel
 

A-572 50

Overview

A 572 Grade 50 is a high-strength, low alloy (HSLA), hot rolled steel plate. This low carbon / low alloy steel promotes good formability and weldability.

 Download A-572 Chemical and Tensile Requirements PDF (30 KB)

Chemical Requirements

Diameter Thickness, or distance between Parallel Faces, in.(mm) Plates and BarsStructural Shapes GroupsBGradeCarbon, max,%Maganese,C max,%Phosphorus, max,%Sulphur max,%SiliconI,D,ESiliconJ,D
 max,%range,%
6 (150) all 42 (290) 0.21 1.35F 0.04 0.05 0.40 0.15-0.40
4 (100) all 50 (345) 0.23 1.35F 0.04 0.05 0.40 0.15-0.40
1¼ (32) 1,2,3 60 (415) 0.26 1.35F 0.04 0.05 0.40 G
>½-1¼ (13-32) 2,3 65 (450) 0.23 1.65F 0.04 0.05 0.40 G
≤½ (13)H 1H 65 (450) 0.26 1.35 0.04 0.05 0.40 G

ACopper when specified shall have a minimum content of 0.20% by heat analysis (0.18% product analysis).
BSee Specification A 6/A 6M.
CManganese, minimum by heat analysis of 0.80% (0.75% product analysis) shall be required for all plates over % in. [10 mm] in thickness; a minimum of 0.50% (0.45% product analysis) shall be required for plates %in. [10 mm] and less in thickness, and for all other products. The manganese to carbon ratio shall not be less than 2 to 1.
DSilicon content in excess of 0.40% by heat analysis must be negotiated.
EBars over 1 in. [40mm] in diameter, thickness, or distance between parallel faces shall be made by a killed steel practice.
FFor each reduction of 0.01% below the specified carbon maximum, an increase of 0.06% manganese above the specified maximum will be permitted up to a maximum of 1.50%.
GThe size and grade is not described in this specification.HAn alternative chemical requirement with a maximum carbon of 0.21% and a maximum manganese of 1.65% is permissible with the balance of the elements as shown in Table 2.
IPlates to 1 ½ in. (40 mm) Thick, Shapes to 426 lb/ft (634 kg/m), Sheet Pilling, Bars, Zees, and Rolled Tees
JPlates Over 1 ½ in (40 mm) Thick and Shapes Over 426 (634 kg/m)

Tensile Requirements

GradeYield Point, minTensile Strength, minMin. Elongation, %B,C,D
 ksi(MPa)ksi(MPa)in 8 in.
(200 mm)
in 2 in.
(50 mm)
42 42 (290) 60 (415) 20 24
50 50 (345) 65 (450) 18 21
60 60 (415) 75 (520) 16 18
65 65 (450) 80 (550) 15 17

ASee specimen Orientation under the Tension Test section of Specification W A6/A6M.
BElongation not required to be determined for floor plate.
CFor wide flange shapes over 426 lb/ft (634 kg/m) elongation in 2 in. (50 mm) of 19% minimum applies.
DFor plates wider than 24 in. (600 mm), the elongation requirement is reduced two percentage points for Grade 42 and 50 (290 and 345), and three percentage points for Grade 60 and 65 (415 and 450). See elongation requirement adjustments in the Tension Test section of Specification A6/A6M.