ASTM A501 Gr.A Gr.B Hot Formed Structural Tubing Seamless Carbon Steel Tube for Construction
Introduction
ASTM A501 is a specification that covers hot-formed structural tubing made from carbon steel. This type of tubing is widely used in construction and structural applications due to its strength and durability. The specification includes two grades: Gr.A and Gr.B, each with distinct mechanical properties and chemical compositions.
Material
The material used in ASTM A501 tubing is carbon steel, which is known for its excellent strength-to-weight ratio and versatility in various construction applications.
Specification
ASTM A501 outlines the requirements for hot-formed structural tubing, including dimensions, tolerances, and mechanical properties. The tubing is typically produced in round, square, or rectangular shapes.
Key Features
- High Strength: Provides excellent load-bearing capabilities.
- Versatility: Suitable for various structural applications.
- Seamless Design: Ensures uniform strength and eliminates weak points.
- Hot Forming Process: Enhances mechanical properties and allows for complex shapes.
Chemical Composition
| Element |
Gr.A (%) |
Gr.B (%) |
| Carbon (C) |
0.26 max |
0.26 max |
| Manganese (Mn) |
0.60-0.90 |
0.60-0.90 |
| Phosphorus (P) |
0.04 max |
0.04 max |
| Sulfur (S) |
0.05 max |
0.05 max |
| Silicon (Si) |
0.10-0.40 |
0.10-0.40 |
Mechanical Properties
| Property |
Gr.A |
Gr.B |
| Yield Strength (ksi) |
35 min |
42 min |
| Tensile Strength (ksi) |
58-70 |
58-75 |
| Elongation (%) |
20 min |
20 min |
| Hardness (Rockwell) |
B70 max |
B70 max |
Steel Grade
- Gr.A: Lower yield strength, suitable for less demanding applications.
- Gr.B: Higher yield strength, ideal for more demanding structural applications.
Application
ASTM A501 structural tubing is commonly used in:
- Building frames
- Bridges
- Towers
- Heavy equipment
- Agricultural structures
Possible Alternative Grades
- ASTM A500: Another specification for cold-formed structural tubing.
- ASTM A53: Standard specification for pipe, which can be used in similar applications.
- ASTM A252: Specification for welded and seamless steel pipe piles.
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