Products Description
Our Advantages
1. High Strength and High Toughness
Our 4340 Steel Tube undergoes quenching and tempering heat treatment and rigorous mechanical property testing, exhibiting extremely high strength and excellent toughness. It can withstand high stress, heavy impact, bending, torsion, and cyclic loads, making it suitable for shafts, axles, drilling tools, and high-load structural components.
2. Precise Dimensions
Our tubes undergo precision cold drawing and strict dimensional control, ensuring that each tube conforms to ASTM A519 standards, suitable for high-precision mechanical engineering applications.
3. Quality Control
Our tubes undergo rigorous chemical composition testing, eddy current testing, and ultrasonic testing to ensure compliance with ASTM A519 and AISI 4340 standards. The tubes are free of internal cracks and voids, and have no surface defects.
4. Machinability
Our tubes are supplied in annealed or normalized conditions, offering excellent machinability for cutting, drilling, turning, and milling. Metallographic examination reveals a clean and uniform microstructure, facilitating processing.
5. Packaging and Shipping
Our pipes are packaged using various methods, including plastic packaging, plastic caps, woven bags, wooden crates, and iron frames. Customized packaging is available, ensuring each package has clear labels and traceability codes. We offer sea, air, and land transportation options.
application areas
- Heavy machinery components
- Drive shafts, axles, and gear shafts
- Oil and gas drilling tools and downhole equipment
- Aerospace landing gear components
- Wheel hubs and crankshafts
- Hydraulic cylinders and high-pressure components
- Drive shafts and connecting rods
Chemical Composition
| Element | C | Si | Mn | Cr | Ni | Mo | P | S |
|---|---|---|---|---|---|---|---|---|
| 4340 | 0.38–0.43 | 0.20–0.35 | 0.60–0.80 | 0.70–0.90 | 1.65–2.00 | 0.20–0.30 | ≤0.025 | ≤0.025 |
Mechanical Properties
| Property | Tensile Strength | Yield Strength | Elongation | Reduction of Area | Hardness | Impact Toughness |
|---|---|---|---|---|---|---|
| Value | 1080–1320 MPa | 930–1080 MPa | ≥10 % | ≥40 % | 28–36 HRC | High at room & low temperature |
Possible Alternative Grades
| Alternative Grades | Reasons |
| 4140 | Low nickel content, high strength, and cost-effective. |
| 4330 | Slightly lower carbon content, resulting in better weldability. |
| 35CrMo / 4135 | Suitable for medium load applications, with good strength. |
| 300M | An ultra-high strength version of 4340 steel, suitable for aerospace applications. |
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Testing Equipment
Factory Equipment
Pickling equipment
Products Package
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