Our company relies on strong R&D capital and technological innovation advantages, actively adapts to the development trend of the Bearing Steel Tube, welding rectangular tubing, seam welded pipe industry, and strives to maintain a strong competitive advantage for the company's products. After years of development, we have created our own brand and cultivated our core competitiveness. With advanced processing equipment, advanced management mode and excellent technical personnel, our company always keeps innovating and forging ahead. Our employees constantly enhance their ability to perform their duties, and can fit the requirements of their positions and undertake their jobs.
Products Description
Cold Drawn Seamless Stainless Automotive Round Steel Tube
Advantages of Cold Drawn Seamless Stainless Automotive Round Steel Tube
- Process Advantages: Our Cold Drawn Seamless Stainless Automotive Round Steel Tube is precision-finished through a cold-drawing process, resulting in precisely controlled dimensions, a smooth surface, and enhanced mechanical properties such as hardness and tensile strength.
- Material Advantages: Our tubes undergo rigorous raw material testing to ensure traceability and verifiable performance indicators. Compliance testing ensures they meet the stringent requirements of automotive applications.
- Seamless Structure: Compared to welded tubes, our seamless tubes lack welds, resulting in greater uniformity, strength, and pressure resistance. Furthermore, the circular cross-section, the most common shape for automotive tubes, allows for uniform pressure and stress tolerance.
applications of Cold Drawn Seamless Stainless Automotive Round Steel Tube
- Fuel injection systems
- Hydraulic systems
- Exhaust components
- Shock absorbers
- Precision mechanical parts
- Cooling and lubrication systems
Size Ranges
| Outer Diameter | 10mm | 12mm | 15mm | 18mm | 20mm |
| Wall Thickness | 1.5mm | 2mm | 2.5mm | 3mm | 3.5mm |
Steel Grades
- 304: A general-purpose stainless steel with corrosion resistance, good formability, and easy cleaning. Used in decorative parts, fuel tanks, sensors, nuts and bolts, etc.
- 316: A molybdenum-containing austenitic stainless steel with excellent corrosion resistance (especially pitting and crevice corrosion). Used in fuel injection systems and components exposed to coastal or high-salt road conditions.
- 409: A less expensive alternative to 304/316, it offers high-temperature oxidation resistance and thermal fatigue resistance, but offers lower corrosion resistance. Used in exhaust systems such as mufflers and exhaust pipes.
- 304L/316L: Low-carbon versions of 304 and 316, which prevent intergranular corrosion after welding or high-temperature service. Used for welded structural parts, battery packs, high-pressure hydraulic components, and turbine core components.
Chemical Composition
| Grade | C (max) | Mn (max) | Si (max) | P (max) | S (max) | Cr | Ni | Mo | Ti / Nb |
| 304 | 0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 18.0–20.0 | 8.0–11.0 | - | - |
| 316 | 0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | - |
| 321 | 0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0–19.0 | 9.0–12.0 | - | Ti ≥ 5 × C |
| 347 | 0.08 | 2.00 | 0.75 | 0.045 | 0.030 | 17.0–19.0 | 9.0–13.0 | - | Nb ≥ 10 × C |
Mechanical Properties
| Property | Tensile Strength | Yield Strength | Elongation | Hardness |
| 304 / 304L | ≥ 520 | ≥ 205 | ≥ 40 | ≤ 90 |
| 316 / 316L | ≥ 530 | ≥ 210 | ≥ 40 | ≤ 95 |
| 321 | ≥ 515 | ≥ 205 | ≥ 40 | ≤ 95 |
| 347 | ≥ 515 | ≥ 205 | ≥ 40 | ≤ 95 |
Possible Alternative Grades
- 317L → for higher molybdenum content, better pitting resistance
- 310S → for high-temperature resistance in exhaust systems
- Duplex Stainless Steels (2205, 2507) → for higher strength and stress corrosion resistance in demanding environments
Products Show
Products Application
Products Package
All of our TP304 TP304L Industrial Pipes/Automotive Industries ASTM A312 A358 Stainless Steel Welded Pipes/Tubes are carefully inspected, meet the quality standards and enjoy a good reputation in the international market. Until now our merchandise are now moving on fast and very popular all over the world. We apply the management principle of process-centered management and the management policy of system as the guide of behavior.
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