ASTM A36 Steel Plate

ASTM A36 Steel General Information

The ASTM A36 steel specification was first issued in 1960.   Today, engineers specify ASTM A36 for more structural steel fabrications than any other type of plate.  As a result, this product is the most purchased hot-roll steel plate in the world and the least expensive of the commercial carbon steels.  The heat ability creates very good welding properties, and the 36 KSI yield strength makes it acceptable for most applications.  Furthermore,  A36 is a mild steel due to it’s relatively moderate hardness.

In addition, A36 is a structural-quality mild carbon steel used in general construction applications, including bolted or welded construction of buildings, bridges and common machine parts to name a few.

A36 Chemical Composition

A36 steel chemical composition table
% Carbon (C)0.250 – 0.290
% Copper (Cu)0.200
% Iron (Fe)98.0
% Manganese (Mn)1.030
% Phosphorus (P)0.040
% Silicon (Si)0.280
% Sulfur (S)0.050

A36 Physical Properties 

A36 steel physical properties table
Steel TypeMild Carbon/Low Carbon
ASTM DesignationA36
Common PGI Inventory0.25” – 6.00″ inquire for thicker plate
Minimum Yield Stress (ksi)36.3
Average Tensile Strength (ksi)58 – 80
Elongation at Breakage23% minimum in 2” (for plate 24” and wider)
OR  20% minimum in 8”
Approximate Hardness (Rc)
Approximate Hardness (Rb)
Brinell Hardness
% Machinability72
Average surface cutting speed (ft/min)120

Common Uses of ASTM A36 Steel Plate

Common uses of A36 include shim plates, gusset plates, bridge plates, bearing plates, robot bases and column base plates.  Also, we typically cut A36 for press parallels, press platens, tooling plates, machine plates, machine frames and pedestals, steel table tops, base plates, mold & die and machine mounting plates.

We provide mill certifications or material test reports (MTR’s) upon request. Mill test reports (MTR’s) include plate specifications, heat numbers, chemical and physical properties listed by the manufacturer or producing mill.  PGI Steel stores an electronic file copy of each MTR, indefinitely.