ASTM A36 Steel Properties, Composition, Yield Strength, Hardness & Equivalent

ASTM A36 steel A36 material mild carbon steel

ASTM A36 Carbon Steel

ASTM A36 steel is one of the most widely used carbon structural steels, although the carbon content of A36 structural steel is maximum 0.29%, it is considered to be the mild steel (content of carbon ≤ 0.25%).

Notes: There are two versions that define low carbon steel, one with a carbon content between 0.04% (0.05%) and 0.25% and the other with between 0.04% (0.05%) and 0.29%.

A36 mild steel is often compared to SAE AISI 1018 because of their similar chemical composition, A36 carbon steel is commonly hot rolled, while 1018 steel is commonly cold rolled.


Material ASTM A36 has good weldability, it is usually hot rolled into rectangle steel, square steel, round steel, steel plate, and is also commonly made into all kinds of steel sections such as H beam, I beam, U channel, steel angle, steel tube, etc.

ASTM A36 Specification & Datasheet

The following tables show material ASTM A36 specification and datasheet including chemical composition, mechanical properties and equivalent grade.

Chemical Composition

A36 Steel Chemical Composition (%, ≤) for Shapes
A360.260.40no requirement0.040.050.20
Chemical Composition (%, ≤), for Steel Plates, Width > 380 mm (15 in.)
SteelCSiMnPSCuThickness (d), mm (in.)
A360.250.40no requirement0.030.030.20d ≤ 20 (0.75)
0.250.400.80-< d≤ 40 (0.75< d≤ 1.5)
0.260.15-0.400.80-< d≤ 65 (1.5< d≤ 2.5)
0.270.15-0.400.85-< d≤ 100 (2.5< d≤ 4)
0.290.15-0.400.85-> 100 (4)
Chemical Composition (%, ≤), for Steel Plates & Bars, Width ≤ 380 mm (15 in.)
SteelCSiMnPSCuThickness (d), mm (in.)
A360.260.40no requirement0.040.050.20d ≤ 20 (0.75)
0.270.400.60-0.900.040.050.2020< d≤ 40 (0.75< d≤ 1.5)
0.280.400.60-0.910.040.050.2040< d≤ 100 (1.5< d≤ 4)
0.290.400.60-0.920.040.050.20> 100 (4)

ASTM A36 Steel Properties

The following lists give ASTM A36 steel properties such as physical and mechanical properties.

A36 Steel Mechanical Properties

  • Tensile Strength: 400-550 MPa;
  • Yield Strength: ≥ 250 MPa (Steel plates thickness > 200mm)
  • Elongation:≥ 20% (steel plates and bars in 200mm thickness); ≥ 23% (50mm)
  • Brinell Hardness: 119-162 (based on the conversion from tensile strength)

Physical Properties

  • Density: 7.85 g/cm3 (0.284 lb/in3)
  • Modulus of elasticity: 200 GPa (29×103 ksi)
  • Poissons ratio: 0.26
  • Shear modulus: 79.3 GPa (11.5×103 ksi)

ASTM A36 Equivalent Grade

ASTM A36 steel equivalent to ISO, European EN (Germany DIN, British BSI, France NF…), Japanese JIS and Chinese GB standard. (For reference)

US ASTM A36 vs European S235, Chinese Q235, Japanese SS440 and Indian E250 Steel.

ASTM A36 equivalent grade
StandardGradeStandardGrade (Steel number)StandardGradeStandardGradeStandardGradeStandardGradeStandardGrade
ASTM A36A36EN 10025-2;
EN 10025: 1993
DIN 17100RSt 37-2,
St 37-2
JIS G3101;
JIS G3106
GB/T 700Q235IS 2062E250ISO 630-2S235A, S235B, S235C


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