Products Description
Product Specifications
| Standards | ASTM A269 / ASME SA269 |
| Steel Grades | TP304 TP304L TP304LN TP316 TP316L TP316LN TP317 TP321 TP347 TP348 TPXM10 TPXM11 TPXM15 TPXM19 TPXM29 |
| Equivalent Standards |
ISO 1127, EN 10216-5, JIS G3459, DIN 17458 |
| Outer Diameter (OD) |
6mm, or customized |
| Wall Thickness (WT) | 0.3 – 3.0 mm |
| Length | 6 m, or customized |
| Surface Treatment | Bright Annealed |
| Production Process | Cold Drawn |
| Condition | Solution Annealed |
The 6mm Seamless Stainless Steel Tube is manufactured using 316/316L austenitic stainless steel, effectively resisting corrosion from automotive hydraulic fluids, acidic and alkaline road contaminants, and moisture. This prevents internal rusting and scaling within the tubing, thereby eliminating issues related to hydraulic fluid contamination and leaks caused by corrosion.
Produced via a seamless cold-rolling process followed by solution heat treatment, the tubing is free of weak points associated with welds. It exhibits superior mechanical strength and pressure resistance, enabling it to withstand the high-pressure surges inherent in automotive hydraulic systems and eliminating safety hazards such as tube rupture or deformation.
Following a bright solution annealing treatment, the tubing attains a soft temper (hardness ≤90 HRB) and possesses excellent cold-working formability, allowing for easy secondary processing operations such as flaring, swaging, bending, and end forming.
Customized Services
- TORICH offers custom manufacturing services tailored to client specifications, covering an outer diameter range of 1–50 mm and a wall thickness range of 0.3–3 mm.
- We provide precision cutting services with a length tolerance of ±0.3 mm, ensuring flat, burr-free end faces.
- Additional services include deburring, chamfering, end-facing, and 37° single- and double-flaring, swaging, and threading.
Chemical Composition
| Steel Grade | C (%) | Mn (%) | Si (%) | Cr (%) | Ni (%) | Mo (%) | P (%) | S (%) |
|---|---|---|---|---|---|---|---|---|
| TP304 | ≤0.08 | ≤2.00 | ≤1.00 | 18.0–20.0 | 8.0–10.5 | - | ≤0.045 | ≤0.030 |
| TP304L | ≤0.03 | ≤2.00 | ≤1.00 | 18.0–20.0 | 8.0–12.0 | - | ≤0.045 | ≤0.030 |
| TP316 | ≤0.08 | ≤2.00 | ≤1.00 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | ≤0.045 | ≤0.030 |
| TP316L | ≤0.03 | ≤2.00 | ≤1.00 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | ≤0.045 | ≤0.030 |
Mechanical Properties
| Property | Tensile Strength | Yield Strength | Elongation (A%) |
| TP304 | ≥515 | ≥205 | ≥35 |
| TP304L | ≥485 | ≥170 | ≥35 |
| TP316L | ≥485 | ≥170 | ≥35 |
Possible Alternative Grades
- For hydraulic lines operating continuously at temperatures exceeding 400°C, 321 stainless steel is the recommended choice, as it is well-suited for extreme high-temperature environments.
- For auxiliary hydraulic lines in entry-level passenger vehicles-where operating conditions are relatively simple-201 stainless steel offers a more economical and cost-effective solution.
- For applications involving extremely high pressure and highly corrosive environments-such as racing vehicle braking systems or high-pressure common-rail fuel lines in heavy-duty commercial vehicles-2205 duplex stainless steel is the preferred material.
Applications areas
ASTM A269 6mm Seamless Stainless Steel Tube is widely utilized in automotive hydraulic and fluid transmission systems, including:
- Automotive Hydraulic Systems: Brake hydraulic lines (ABS/EBS systems), clutch hydraulic lines, etc.
- Automotive Fluid Transfer Systems: Fuel injection and fuel delivery lines, transmission fluid cooling lines, etc.
- Automotive Structural and Functional Tubing: Shock absorber and suspension fluid lines, chassis-mounted hydraulic line systems, etc.
- New Energy and Advanced Vehicles: Battery thermal management system piping, electric vehicle (EV) fluid transmission systems, etc.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: Which material-304 or 316L-is more suitable for automotive hydraulic lines? How should one choose?
A: For hydraulic lines in standard passenger vehicles (involving no severe corrosion and operating under normal pressure), 304 is the appropriate choice. However, for commercial vehicles, new energy vehicles, and models deployed in coastal regions (where corrosion and high-pressure operating conditions are present), 316L is recommended.
Q: What surface treatment options are available?
A: The standard surface treatments are Bright Annealing (BA) and Acid Pickling & Passivation (AP); optional treatments include Electropolishing (EP) and Sandblasting.
Q: Do the materials comply with RoHS and REACH environmental certifications?
A: The tubing complies with both RoHS and REACH environmental standards, making it fully suitable for applications in new energy vehicles.
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