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Low Carbon, High Manganese Grades for Added Strength Applications
 

A-656 60-80

Overview

An 80,000 minimum yield grade used in construction areas where added strength is a concern. This low carbon / high manganese grade achieves it's physical characteristics through the controlled rolled process along with small additions of Vanadium and Columbium. The low carbon provides good welding characteristics and enhanced forming capabilities.

Chemical Requirements

Note - A "-" indicates that element is not defined for that Type.

ElementComposition
Type 3Type 7Type 8
Carbon, maxA 0.18 0.18 0.18
Manganese, maxA 1.65 1.65 1.65
Phosphorus, max 0.025 0.025 0.025
Sulfur, max 0.035 0.035 0.035
Silicon, max 0.60 0.60 0.60
Vanadium, max 0.08 0.15B 0.15C
Nitrogen, max 0.030 0.030 0.030
Columbium 0.008-0.10 0.10 maxB 0.10 maxC
Titanium, max - - 0.15C

AFor each reduction of 0.01 percentage point below the specified maximum for carbon, an increase of 0.06 percentage points above the specified maximum for manganese is permitted, up to a maximum of 1.75% for Grades 50, 60 and 70; and up to a maximum of 1.90% for Grades 80 and 100.
BThe contents of columbium and vanadium shall additionally be in accordance with one of the following:
columbium 0.008-0.10% with vanadium <0.008%;
columbium <0.008% with vanadium 0.008-0.15%; or
columbium 0.008-0.10% with vanadium 0.008-0.15% and columbium plus vanadium not in excess of 0.20%.
CThe sum of columbium, vanadium, and titanium shall be between 0.008 and 0.20%.

Tensile Requirements

 Grade 50
[345]
Grades 60
[415]
70
[485]
80
[550]
100
[690]
Yield point, min, ksi [MPa] 50 [345] 60 [415] 70 [485] 80 [550] 100 [690]
Tensile strength, ksi [MPa] 60 [415] 70 [485] 80 [550] 90 [620] 110 [760]
Elongation in 8 in. [200 mm], min, % 20B 17B 14B 12B 12B
Elongation in 2 in. [50 mm], min, % 23B 20B 17B 15B 15B

ASee specimen orientation under the Tension Tests section of Specification A6/A6M.
BFor plates wider than 24 in. [600 mm], the elongation requirement is reduced two percentage points for Grade 50 [345] and three percentage points for Grades 60, 70, 80 and 100 [415, 485, 550 and 690]. See Elongation Requirement Adjustments in the Tension Tests section of Specification A6/A6M.