ASTM A706

ASTM A706 Scope ASTM A706 covers deformed and plain low alloy steel bars for concrete reinforcement with restrictive mechanical properties and chemical composition in order to enhance weldability. This specification covers bars and coils in two grades, Grade 60 and Grade 80. The grade designates the yield strength of the material, i.e. Grade 60 has a 60ksi minimum yield.

A706 Designation Numbers Bar No. Nominal Diameter 3 0.375” 4 0.500” 5 0.625” 6 0.750” 7 0.875” 8 1.000” 9 1.128” 10 1.270” 11 1.410” 14 1.693” 18 2.257”

A706 Mechanical Requirements Grade 60 Grade 80 Tensile, ksi 80 100 Yield, ksi 60-78 80-98 Elongation in 8” Bar size #3,4,5,6 14 12 7,8,9,10,11 12 12 14,18 10 10 *Tensile strength shall not be less than 1.25 times the actual yield strength

A706 Chemical Requirements Element Carbon Manganese Phosphorous Sulfur Silicon

Max % 0.30 1.50 0.035 0.045 0.50

A706 Bend Test Requirements

Bar Designation# Pin Dia, Grade 60 Pin Dia, Grade 80 3,4,5 3d 3-1/2d 6,7,8 4d 5d 9,10,11 6d 7d 14,18 8d 9d

Weldability In addition to the above chemical requirements, A706 rebar must also have a carbon equivalent (CE) not exceeding 0.55%. The way to calculate this is to plug the chemical composition figures for a given heat lot of steel into the following formula:

CE = %C + (%Mn / 6) + (%Cu / 40) + (%Ni / 20) + (%Cr / 10) – (%Mo / 50) – (%V / 10) Rebar produced to this specification shall be marked with the letter “W” to indicate weldability.

ASTM A615 Scope ASTM A615 covers deformed and plain carbon steel bars for concrete reinforcement. This specification covers bars and coils in four grades, Grade 40, Grade 60, Grade 75, and Grade 80. The grade designates the yield strength of the material, i.e. Grade 60 has a 60ksi minimum yield.

A615 Designation Numbers Bar No. Nominal Diameter 3 0.375” 4 0.500” 5 0.625” 6 0.750” 7 0.875” 8 1.000” 9 1.128” 10 1.270” 11 1.410” 14 1.693” 18 2.257”

A615 Mechanical Requirements Tensile, ksi Yield, ksi Elongation in 8” Bar size #3 4,5,6 7,8 9 thru 18

Grade 40 Grade 60 Grade 75 Grade 80 60 90 100 105 40 60 75 80 11 12 -

9 9 8 7

7 7 7 6

7 7 7 6

A615 Bend Test Requirements Bar Designation# 3,4,5 6 7,8 9,10,11 14,18

Pin Dia. Grade 40 3-1/2d 5d -

Pin Dia, Grade 60 3-1/2d 5d 5d 7d 9d

Pin Dia, Grade 75 5d 5d 5d 7d 9d

Pin Dia, Grade 80 5d 5d 5d 7d 9d

Weldability Welding this material should be approached with caution since no specific provisions have been included to enhance weldability. If weldable rebar is required, rebar per ASTM A706 should be considered.