Products Description
Product Specifications
| Standards | ASTM A632 |
| Steel Grades | TP 304 TP 304L TP 310 TP 316 TP 316L TP 317 TP 321 TP 347 TP 348 |
| Equivalent Standards | EN 10216-5, EN 10305-1, ASTM A269, ASTM A213, JIS G3459 |
| Outer Diameter (OD) | 1.27 mm - 25.4 mm, customized |
| Wall Thickness (WT) | 0.13 mm - 2.5 mm, customized |
| Length | 6/12 m, customized |
| Surface Treatment | Bright annealed, pickled/passivated or customized |
| Production Process | Cold Drawn, Cold Rolled |
| Condition | Bright-annealed |
TORICH ASTM A632 precision stainless steel tubing undergoes bright annealing, leaving a surface free of heavy oxide scale; the inner surface roughness typically reaches Ra 0.2–0.4 μm-far superior to standard pickled tubing-making it ideal for high-cleanliness applications such as automotive fuel injection and sensor protection.
Compared to welded stainless steel tubing, seamless tubing lacks weld seams, thereby eliminating issues such as microstructural non-uniformity, residual stresses, and potential corrosion-prone weak points. In systems such as automotive braking and high-pressure common-rail fuel injection, seamless BA (bright annealed) tubing offers a superior safety margin regarding burst pressure and enhanced fatigue resistance.
Customized Services
- TORICH offers customization for non-standard outside diameters (4mm–127mm) and special wall thicknesses (0.5mm–3mm), with cutting to any specified length between 100mm and 6000mm.
- Services include deburring, chamfering, flaring, swaging, flattening, grooving, flanging, and weld-end preparation.
- 3D tube bending is available based on customer drawings, with precise control over bending radius, ovality, and wall thinning rates.
- Surface treatment options include bright annealing, pickling and passivation, electropolishing, internal cleaning and degreasing, and ultrasonic cleaning.
Chemical Composition
| Grade | C (max) | Mn (max) | P (max) | S (max) | Si (max) | Cr (%) | Ni (%) | Mo (%) | Nb/Ti (%) | N (%) |
| TP 304 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0–20.0 | 8.0–11.0 | – | – | – |
| TP 316L | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | – | – |
| TP 348 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0–19.0 | 9.0–13.0 | – | Nb+Ta ≥10×C% | – |
Mechanical Properties
| Grade | Tensile Strength (MPa) | Yield Strength (MPa, 0.2% offset) | Elongation (%) | Hardness (HRB,max) |
| TP 304 | ≥515 | ≥205 | ≥35–40 | 92 |
| TP 316L | ≥485 | ≥170 | ≥40 | 95 |
| TP 348 | ≥515 | ≥205 | ≥35 | 95 |
Possible Alternative Grades
- EN 10216-5 – Seamless stainless steel tubes for pressure applications in Europe.
- EN 10305-1 / EN 10305-5 – Precision tubes for mechanical and automotive applications (covers precision dimensional tolerances).
- ISO 1127 – Stainless steel tubes with defined tolerances and surface finishes for industrial and sanitary applications.
- ASTM A554 – Welded stainless steel tubing, primarily for structural and mechanical applications where appearance and surface finish are important.
application aresa
- Automotive sensor and instrumentation systems: pressure sensor lines, temperature sensor lines, pressure measurement lines, sensor connecting tubes, etc.
- Electric vehicle battery thermal management: coolant sensor lines, auxiliary cooling system piping, battery thermal management monitoring equipment, etc.
- Fuel systems: fuel delivery lines, fuel return lines, high-pressure fuel supply lines, etc.
- Hydraulic and pneumatic controls: small-bore hydraulic control lines, pressure measurement lines, pneumatic sensing lines, etc.
- Automotive exhaust systems: low-temperature exhaust auxiliary lines, exhaust emission sensor lines.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Polishing equipment
Cold drawing equipment
Products Package
FAQ
Q: What are the differences between BA, 2B, and EP surface finishes?
A: BA (Bright Annealed) involves bright annealing in a protective atmosphere, resulting in a shiny surface free of visible oxide scale, typically with a roughness (Ra) of 0.2–0.4 μm. 2B involves cold rolling followed by pickling and annealing, producing a matte finish. EP (Electropolished) offers a mirror-like, ultra-smooth finish with an Ra value potentially below 0.1 μm, though it comes at a higher cost.
Q: Which material is more suitable for automotive fuel lines: 304L or 316L?
A: For standard gasoline or diesel fuel lines, 304L offers the best cost-performance ratio. However, for vehicles using corrosive additives, ethanol-blended gasoline, or new energy hybrid fuels, 316L (which contains molybdenum) is recommended due to its superior corrosion resistance and longer service life.
Q: What level of dimensional tolerance can be achieved?
A: We adhere to precision automotive tolerance standards: an outer diameter tolerance of ±0.05 mm, a wall thickness tolerance of ±0.03 mm, and straightness within ≤0.5 mm/m-precision levels far exceeding those of standard industrial tubing.
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