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
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