Stock Size
Rebar is typically offered in 20 ft lengths
A615 vs A706
A615 has a higher carbon content which makes it harder, more brittle, and less ductile
A706 can better absorb energy, making it a common choice for seisemic application
In most situations A615 needs to be preheated (200°F to 400°F) before welding as per AWS D1.4
Larger bars of A706 need to be preheated to 50°F before welding as per AWS D1.4
Deformed vs Plain
Rebar is offered as deformed or plain, defomred is more common
Plain Bar: steel bar without protrusions
Deformed Bar: steel bar with protrusions; a bar that is intended for use as reinforcement in reinforced concrete construction
Other Specifications & Grades
ASTM A615 is also offered in GR 75, but GR 40 and GR 60 are more readily available