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ASTM A615 Reinforcement bar A615-40 Grade Steel

What is A615-40 GRADE Steels? A615-40 grade steel is a structural billet steel for structural applications. A615-40 grade is a material grade and designation defined in ASTM A615 standard. ASTM A615 is an international material standard for reinforcement bar billet steel for strengthening application. A615-40 grade Steel is higher in strength as compare to SR30 steel.

Dimensional Characteristics of A615-40 Grade Steels: The applicable diameter for this A615-40 GRADE material as defined in the ASTM A615 ranges to 35.8 mm. The perimeter is usually around 112.5 mm. The cross sectional area is about 1006 mm2.

The Chemical Composition of A615-40 Grade Steels: ASTM A615 defines the chemical composition of A615-40 Grade steels as under:

Only Maximum percentage of Phosphorous (P) is identified by the standard i.e. 0.060

Remaining is iron (Fe) percentage and with few other alloys and negligible impurities.

Mechanical Properties of A615-40 Grade Steels: The tensile strength of the A615-40 Grade Steels is expressed in Newton per millimeters and it must be at-least 483 N/mm2 (MPa). The yield strength is minimum 276 N/mm2 (MPa). The minimum percentage ranges for elongation is 12% thicknesses.

ASTM A615 Grade 40 rebar is a general steel bar and is commonly utilized as a tensioning stratagem in reinforced concrete and strengthened building materials structures holding the concrete in compression. It is typically designed from carbon steel and is prearranged crests for improved mechanical fastening into the concrete.                                    


Engineer Ali Alvi is an industrial engineer who has post graduated from the NED University, then completed his Masters in Industrial Engineering from the University of Ontario. He has also served as an engineer in International Steel Ltd as A Cold rolling mill engineer.

  1. Abhishek says:

    Thanks clear & simply explained

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