Products Description
Why Choose ASTM A108 Chromoly Square Tube?
- Compared with round tubes, square tubes have stronger local stability, and the right-angle edge design of square tubes can effectively disperse plane pressure. For example, square tube columns used in building frames can be directly welded to the wall plane, reducing the use of connectors and improving the overall stability of the structure.
- Chromium-molybdenum alloy steel is also widely used in the automotive field, and it has a significant weight reduction effect. Under the same strength, the wall thickness of chromium-molybdenum square tubes can be thinned by more than 30%, directly reducing the weight of the car body, and can be used for car frames.
- Another advantage of Chromoly Steel is its high temperature resistance, which can be used in extremely high temperature fields, such as the construction of racing exhaust systems or engine components.
Applications of ASTM A108 Chromoly Square Tube
ASTM A108 Chromoly Square Tubing finds application in various industries such as automotive, aerospace, construction, and sports equipment manufacturing. It is commonly used in the fabrication of frames, roll cages, bicycle components, and other structural components where high strength and rigidity are required.
Chemical Composition
The chemical composition of ASTM A108 Chromoly Square Tubing typically includes the following elements:
| Element | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Chromium (Cr) | Molybdenum (Mo) |
| Composition | 0.15 - 0.25% | 0.70 - 0.90% | 0.040% max | 0.040% max | 0.15 - 0.35% | 0.80 - 1.10% | 0.15 - 0.25% |
Mechanical Properties
The ASTM A108 Chromoly Square Tubing exhibits excellent mechanical properties, making it suitable for various applications. The following table outlines the typical mechanical properties of this tubing:
| Property | Tensile Strength | Yield Strength | Elongation | Hardness | Impact Strength |
| Value | 700 - 900 MPa | 620 - 800 MPa | 10 - 20% | HRB 80 - 100 | 50 - 70 J |
Possible Alternative Grades
- ASTM A519 (4130/4140) – Seamless mechanical tubing with similar chemistry
- ASTM A513 Type 5 – DOM tubing for precision and smooth inner surfaces
- EN 10297-1 (25CrMo4, 42CrMo4) – European equivalents
- SAE 1026 or 1045 – Lower alloy alternatives for less demanding applications
Packaging
Once the pipes have passed all inspections and tests, they are ready for packaging. They are usually packaged in bales wrapped in plastic. The pipes can be bundled and ready for delivery according to customer requirements, ensuring that the pipes are protected during transportation and prevent surface damage.
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