Rebar is available in different grades and specifications that vary in yield strength, ultimate tensile strength, chemical composition, and percentage of elongation.
The grade designation is equal to the minimum yield strength of the bar in ksi (1000 psi) for example grade 60 rebar has a minimum yield strength of 60 ksi. Rebar is typically manufactured in grades 40, 60, and 75.
Common specification are...
Historically in Europe, rebar is composed of mild steel material with a yield strength of approximately 250 N/mm˛. Modern rebar is composed of high-yield steel, with a yield strength more typically 500 N/mm˛. Rebar can be supplied with various grades of ductility, with the more ductile steel capable of absorbing considerably greater energy when deformed - this can be of use in design to resist the forces from earthquakes for example.
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