A36 steel

A36 steel is a common structural steel in the United States.[1] The A36 standard was established by the ASTM International.

Chemical CompositionEdit

Chemical Composition (%, ≤) for Shapes
Standard C Si Mn P S Cu
ASTM A36/A36M 0.26 0.40 - 0.04 0.05 0.20

Note: For shapes with a flange thickness more than 3 in (76 mm), 0.85-1.35% manganese content and 0.15-0.40% silicon content are required.


As with most steels, A36 has a density of 7,800 kg/m3 (0.28 lb/cu in). Young's modulus for A36 steel is 200 GPa (29,000,000 psi).[2] A36 steel has a Poisson's ratio of 0.32, and a shear modulus of 78 GPa (11,300,000 psi).

A36 steel in plates, bars, and shapes with a thickness of less than 8 in (203 mm) has a minimum yield strength of 36,000 psi (250 MPa) and ultimate tensile strength of 58,000–80,000 psi (400–550 MPa). Plates thicker than 8 in have a 32,000 psi (220 MPa) yield strength and the same ultimate tensile strength of 58,000–80,000 psi (400–550 MPa).[1] The electrical resistance of A36 is 0.142 μΩm at 20 °C. A36 bars and shapes maintain their ultimate strength up to 650 °F (343 °C). Afterward, the minimum strength drops off from 58,000 psi (400 MPa): 54,000 psi (370 MPa) at 700 °F (371 °C); 45,000 psi (310 MPa) at 750 °F (399 °C); 37,000 psi (260 MPa) at 800 °F (427 °C).

Fabricated formsEdit

A36 is produced in a wide variety of forms, including:

  • Plates
  • Structural Shapes
  • Bars
  • Girders
  • Angle iron
  • T iron

Methods of joiningEdit

A36 is readily welded by all welding processes. As a result, the most common welding methods for A36 are the cheapest and easiest: shielded metal arc welding (SMAW, or stick welding), gas metal arc welding (GMAW, or MIG welding), and oxyacetylene welding. A36 steel is also commonly bolted and riveted in structural applications.

See alsoEdit


  1. ^ a b Steel Construction Manual, 8th Edition, second revised edition, American Institute of Steel Construction, 1986, Ch. 1 pp. 1–5.
  2. ^ "MatWeb A36 steel bar". MatWeb. Retrieved 21 January 2012.