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A High Strength with Superior Notch Toughness
 

A-633

Overview

This is a high-strength / low alloy grade produced in the normalized condition. It is predominantly used in environments where superior notch toughness is needed at low ambient temperatures. Typical applications is in the areas of construction equipment, offshore support structures, and other construction areas where additional strength is critical.

Chemical Requirements

Note - Where "-" appears in this table, there is no requirement.

ElementGrade A, %Grade C, %Grade D, %Grade E, %A
Carbon, max 0.18 0.20 0.20 0.22
Manganese:  
    1 ½ in. [40 mm] and under in thickness 1.00-1.35 1.15-1.50B 0.70-1.35 1.15-1.50
    Over 1 ½ in. to 4 in. [40 to 100 mm], incl 1.00-1.35 1.15-1.50B 1.00-1.60 1.15-1.50
    Over 4 in. to 6 in. [100 to 150 mm], incl C C C 1.15-1.50
Phosphorus, max 0.035 0.035 0.035 0.035
Sulfur, max 0.04 0.04 0.04 0.04
Silicon 0.15-0.50 0.15-0.50 0.15-0.50 0.15-0.50
Vanadium - - - 0.04-0.11
Columbium 0.05 max 0.01-0.05 - D
Nitrogen, max - - - 0.03
Copper, max - - 0.35 -
Nickel, max - - 0.25 -
Chromium, max - - 0.25 -
Molybdenum, max - - 0.08 -

AFor Grade E the minimum total aluminum content shall be 0.018%, or the vanadium nitrogen ratio shall be 4:1 minimum.
BFor Grade C manganese content may be increased to 1.60% maximum provided the carbon content does not exceed 0.18%.
CThe size and grade is not described in this specification.
DColumbium may be present in the amount of 0.01 to 0.05%.

Tensile Requirements

 Grade AGrades C and DGrade E
Yield point, min, ksi [MPa]:  
    2.5 in. [65 mm] and under 42 [290] 50 [345] 60 [415]
    Over 2.5 in. to 4 in. [65 to 100 mm], incl 42 [290] 46 [315] 60 [415]
    Over 4 in. to 6 in. [100 to 150 mm], incl B B 55 [380]
Tensile strength, ksi [MPa]:  
    2.5 in. [65 mm] and under 63 to 83 [430 to 570] 70 to 90 [485 to 620] 80 to 100 [550 to 690]
    Over 2.5 in. to 4 in. [65 to 100 mm], incl 63 to 83 [430 to 570] 65 to 85 [450 to 590] 80 to 100 [550 to 690]
    Over 4 in. to 6 in. [100 to 150 mm], incl B B 75 to 95 [515 to 655]
Elongation in 8 in. [200 mm], min, %C 18 18 18
Elongation in 2 in. [50 mm], min, %C 23 23 23

ASee specimen orientation under the Tension Tests section of Specification A6/A6M.
BThe size and grade is not described in this section.
CFor plates wider than 24 in. (610 mm), the elongation requirement is reduced two percentage points. See elongation requirement adjustments in the Tension Test section of Specification A6/A6M.