ASTM A36/A36M High-Strength Low-Alloy Carbon Steel Plate

1. Standard and Grade Overview

Standard: ASTM A36/A36M is a widely used American standard for carbon structural steel (not strictly low-alloy, but often categorized as such for its moderate strength and versatility).

A36: Specified in US customary units.

A36M: Metric equivalent (M denotes metric).

Classification: A mild to medium-strength steel with good ductility, weldability, and formability, ideal for general structural applications.

2. Chemical Composition (Typical, %)

Element	Max Content	Notes
Carbon (C)	0.26%	Low carbon ensures weldability and ductility.
Manganese (Mn)	1.65%	Enhances strength and hardenability.
Phosphorus (P)	0.04%	Controlled to minimize brittleness.
Sulfur (S)	0.05%	Controlled to improve hot workability.
Silicon (Si)	0.40% (optional)	Sometimes added for deoxidation.

 

 

 

 

 

Key Note: A36 is primarily a carbon steel with minimal alloying elements, distinguishing it from true low-alloy steels like ASTM A572.

3. Mechanical Properties

Property	Typical Values (Thickness ≤ 100 mm)
Yield Strength (Re)	≥ 250 MPa (36 ksi, hence the name "A36")
Tensile Strength	400–550 MPa (58–80 ksi)
Elongation (200 mm gauge)	≥ 20%
Impact Toughness	Not specified (non-mandatory, but A36 has moderate notch toughness)

 

Thickness Effect: Yield strength may slightly decrease for thicker sections (e.g., ≥ 240 MPa for thickness > 100 mm).

 

 

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