A572 Grade 50 is a common, high-strength, low-alloy (HSLA) structural steel with a minimum yield strength of 50 ksi (50,000 psi), known for its excellent strength-to-weight ratio, making it ideal for bridges, heavy construction, truck frames, and poles, as it provides significant strength in lighter profiles compared to standard A36 steel. It's readily weldable and formable, often replacing older grades, and is used in beams, channels, angles, and plates for demanding applications.
Key Properties
Yield Strength: Minimum 50 ksi (50,000 psi)
Tensile Strength: Minimum 65 ksi (65,000 psi)
Type: High-Strength Low-Alloy (HSLA) Columbium-Vanadium Steel
Weldability:
Good, similar to A36 steel
Benefits
High Strength-to-Weight Ratio: Delivers more strength with less material.
Versatile: Used in many forms (plate, beam, angle).
Economical: Cost-effective for high-strength needs.
Equivalent
Often dual-certified as A36/A572-50, offering higher strength than standard A36.
European equivalent is S355.
Available Dimensions
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|
Grade |
Product type |
Thickness |
Width |
Length |
|---|---|---|---|---|
|
ASTM A572 Grade 50 |
Mill Plate |
0.188 - 4.00 |
60 - 131.9 |
120 - 1020 |
|
ASTM A572 Grade 50 |
Temper Leveled Plate |
0.100 - 0.625 |
48 - 96 |
72 - 720 |
|
- |
Coil for Conversion To |
0.188 - 0.625 |
60 - 96 |
- |
Mechanical Properties
Tensile testing is performed in the transverse direction according to ASTM A6 requirements. The tensile propertyrequirements are tablulated below:
Hide/Show specific columns Edit
|
Grade |
Thickness |
Yield strength |
Tensile strength |
Elongation in 2" 1) |
Elongation in 8" 1) |
|---|---|---|---|---|---|
|
ASTM A572 Grade 50 |
0.100 - 4.00 |
50 |
65 |
21 |
18 |
Yield/Tensile Strength
|
Metric |
Imperial |
|
|
Tensile Strength, Ultimate |
450 MPa |
65,300 psi |
|
Tensile Strength, Yield |
345 MPa |
50,000 psi |
|
Elongation at Break (in 200 mm) |
18.0% |
18.0% |
|
Elongation at Break (in 50 mm) |
21.0% |
21.0% |
|
Brinell Hardness |
135 |
135 |
|
Rockwell Hardness |
74 |
74 |
|
Modulus of Elasticity |
200 GPa |
29 ksi |
|
Shear Modulus |
80 GPa |
11.6 ksi |
1. What is A572 Grade 50 steel used for?
A572 Grade 50 is commonly used in structural applications like building frames, bridges, transmission towers, and construction equipment where higher strength than A36 steel is needed.
2. What is the yield strength of A572 Grade 50?
The minimum yield strength of A572 Grade 50 is 50 ksi (345 MPa).
3. What is the difference between A572 Grade 50 and A36?
The main difference is strength: A572 Grade 50 has a higher yield strength (50 ksi vs. 36 ksi) and is a high-strength low-alloy (HSLA) steel, while A36 is a mild carbon steel.
4. Can A572 Grade 50 be welded?
Yes, it has good weldability using common methods like shielded metal arc welding (SMAW) and gas metal arc welding (GMAW), though proper procedures should be followed.
5. What is the chemical composition of A572 Grade 50?
It typically contains elements like carbon (max 0.23%), manganese (max 1.35%), phosphorus, sulfur, and may include small amounts of columbium, vanadium, or nitrogen for strengthening.
6. Is A572 Grade 50 corrosion resistant?
No, it is not a corrosion-resistant grade. For outdoor or corrosive environments, it usually requires protective coatings like paint or galvanizing.
7. What are the available forms of A572 Grade 50?
It is widely available in structural shapes (beams, channels, angles), plates, bars, and sheets.
8. What is the equivalent of A572 Grade 50 in European standards?
The closest European equivalent is S355JR or S355J2 according to EN 10025-2, though exact matching depends on thickness and impact requirements.
9. How does A572 Grade 50 compare to A992 steel?
A992 is a newer, more tightly controlled structural steel primarily for wide-flange shapes, with similar yield strength (50-65 ksi) but stricter chemical and mechanical limits.
10. What is the price of A572 Grade 50 compared to A36?
A572 Grade 50 typically costs 10-25% more than A36 due to its higher strength and alloy content, but prices vary with market conditions and order size.
Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staff.
