ASTM A572 Grade 50 Low Alloy Pipe High Strength Low-Alloy Structural Steel Tube For Transporting Fluid
ASTM A572 Grade 42 50 55 60 65 Low Alloy Pipe
High-Strength Low-Alloy Structural Steel Tube for Transporting Fluid
Specification
ASTM A572 is a specification for high-strength low-alloy structural steel plates and bars for use in building structures and other applications. The grades of A572 steel are categorized based on their yield strength, with Grade 42, 50, 55, 60, and 65 being the most common. These grades are designed to provide improved mechanical properties and greater resistance to atmospheric corrosion compared to conventional carbon steels.
Key Features
- High Strength: Offers excellent yield and tensile strength.
- Low Alloy: Contains a small percentage of alloying elements, enhancing strength and toughness.
- Versatility: Suitable for a wide range of structural applications.
- Weldability: Good weldability makes it ideal for construction and fabrication.
- Corrosion Resistance: Better resistance to corrosion compared to standard carbon steels.
Chemical Composition
| Grade | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Copper (Cu) | Nickel (Ni) | Chromium (Cr) | Molybdenum (Mo) |
|---|---|---|---|---|---|---|---|---|---|
| 42 | 0.21 max | 1.35 max | 0.04 max | 0.05 max | 0.40 max | 0.20 max | 0.40 max | 0.30 max | 0.10 max |
| 50 | 0.21 max | 1.35 max | 0.04 max | 0.05 max | 0.40 max | 0.20 max | 0.40 max | 0.30 max | 0.10 max |
| 55 | 0.21 max | 1.35 max | 0.04 max | 0.05 max | 0.40 max | 0.20 max | 0.40 max | 0.30 max | 0.10 max |
| 60 | 0.21 max | 1.35 max | 0.04 max | 0.05 max | 0.40 max | 0.20 max | 0.40 max | 0.30 max | 0.10 max |
| 65 | 0.21 max | 1.35 max | 0.04 max | 0.05 max | 0.40 max | 0.20 max | 0.40 max | 0.30 max | 0.10 max |
Mechanical Properties
| Grade | Yield Strength (ksi) | Tensile Strength (ksi) | Elongation (%) | Reduction of Area (%) |
|---|---|---|---|---|
| 42 | 42 | 60-80 | 21 | 50 |
| 50 | 50 | 65-85 | 20 | 50 |
| 55 | 55 | 70-90 | 19 | 50 |
| 60 | 60 | 75-95 | 18 | 50 |
| 65 | 65 | 80-100 | 17 | 50 |
Steel Grade
The ASTM A572 specification includes several grades, each with specific mechanical properties and chemical compositions. The grades are:
- Grade 42
- Grade 50
- Grade 55
- Grade 60
- Grade 65
Application
ASTM A572 steel is widely used in various applications, including:
- Structural beams and columns in buildings and bridges
- Heavy equipment and machinery
- Transmission towers
- Rail and highway structures
- Storage tanks and vessels
Possible Alternative Grades
While ASTM A572 is a popular choice for structural applications, there are alternative grades that may be considered based on specific requirements:
- ASTM A992: Often used for steel buildings and structures.
- ASTM A36: A standard carbon structural steel grade.
- ASTM A500: A specification for cold-formed welded and seamless carbon steel structural tubing.
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