45 steel (ASTM A36) is harder after quenching. Because the carbon content of 45 steel (ASTM A36) is slightly higher, about 0.45%. Rebar , that is, hot-rolled ribbed concrete steel bars, it is used in the steel bars inside the concrete, and the ribs are used to enhance the grip with the concrete. 45 steel (ASTM A36), that is, carbon knot steel 45# (ASTM 1045), has high carbon content, strong hardness, brittleness, and is mostly used for machined parts, etc. (The corresponding American Standards are in brackets.)

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