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Rebar or reinforcement is a circular cross-section steel used to reinforce and compensate for low tensile strength of concrete in construction structures.
Ribbed rebar is designed to improve adhesion between concrete and steel.
The rebar is manufactured according to different standards. The rebar manufactured in Iran is often based on Russian standards and is divided into 4 groups A1, A2, A3, and A4.
The rebar differ in physical properties in terms of yield strength and tensile strength, and A1 having the lowest yield and tensile strength and A4 having the highest value.
The A1 rebar is often manufactured from the ST37 ingot and is known as the soft and industrial rebar because of its low carbon content. The A2 and A3 bars have higher and harder carbon levels due to the production of ingot 5.
