ASTM A36 / A283-C / A516 (Grade 55, 60, 65) / A572 (Gr 50, 60, 70) High Strength Steel Plates

These steel plates, defined by ASTM standards, are widely used in structural engineering, pressure vessels, and heavy machinery due to their tailored mechanical properties (strength, ductility, and weldability). Below is a detailed comparison and overview of each grade:

1. ASTM A36 Carbon Structural Steel Plate

ASTM A36 is the most common carbon structural steel, valued for its balance of strength, formability, and affordability.

 

Key Properties:

Chemical Composition: C ≤0.25%, Mn 0.80-1.20%, P ≤0.04%, S ≤0.05%, Si ≤0.40%.

Mechanical Properties:

Yield Strength: ≥250 MPa (36 ksi).

Tensile Strength: 400-550 MPa (58-79 ksi).

Elongation: ≥20% (in 200mm gauge).

2. ASTM A283-C Low-Carbon Steel Plate

ASTM A283-C is a low-strength carbon steel for non-critical structural and pressure vessel applications.

 

Key Properties:

Chemical Composition: C ≤0.27%, Mn ≤0.90%, P ≤0.04%, S ≤0.05%.

Mechanical Properties:

Yield Strength: ≥170 MPa (25 ksi).

Tensile Strength: 310-440 MPa (45-64 ksi).

Elongation: ≥22% (in 50mm gauge).

3. ASTM A516 (Grade 55, 60, 65) Pressure Vessel Steel Plates

ASTM A516 is a carbon steel designed for moderate- to low-temperature pressure vessels, with grades differentiated by tensile strength.

 

 

 

 

 

 

 

Key Properties:

Chemical Composition: C ≤0.30% (varies by grade), Mn 0.79-1.30%, P ≤0.035%, S ≤0.035%, Si 0.13-0.45%.

Mechanical Properties (by grade):

Grade	Yield Strength (min)	Tensile Strength Range	Elongation (min)
A516 Gr 55	240 MPa (35 ksi)	415-550 MPa (60-80 ksi)	22%
A516 Gr 60	275 MPa (40 ksi)	450-585 MPa (65-85 ksi)	21%
A516 Gr 65	310 MPa (45 ksi)	485-620 MPa (70-90 ksi)	20%

Impact Toughness: Requires Charpy V-notch testing at -30°C (-22°F) for low-temperature service (optional, per customer request).

Delivery Condition: Normalized (to ensure toughness) or quenched-and-tempered for thick plates.

 

 

 

 

 

 

 

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