Products Description
Product Specifications
| Standards | ASTM A269/A269M |
| Steel Grades | TP201 TP201LN TP304 TP304L TP304LN TP316 TP316L TP316LN TP317 TP321 TP347 TP348 TPXM10 TPXM11 TPXM15 TPXM19 TPXM29 |
| Equivalent Standards | EN 10217-7 (1.4301, 1.4404), DIN (X5CrNi18-10, X2CrNiMo17-12-2) |
| Outer Diameter (OD) | 0.3 mm - 30 mm |
| Wall Thickness (WT) | 0.08 mm - 5 mm |
| Length | up to 500 m |
| Surface Treatment | Bright Annealed |
| Production Process | TIG welding |
| Condition | Soft annealed |
Welded Capillary Stainless Steel Tube operates stably across a wide temperature range of -40°C to 870°C, exhibiting no thermal deformation or brittle cracking, making it well-suited for the extreme environments encountered in automotive applications.
These stainless steel capillary tubes possess excellent bending and forming properties; they can undergo cold bending without the need for heat treatment, free from issues such as work hardening or cracking.
Due to their lower carbon content, grades TP304L and TP316L offer superior weldability; they retain their corrosion resistance after welding without requiring post-weld annealing. This makes them particularly well-suited to meet the complex forming and welding process requirements of automotive tubing systems.
Customized Services
- TORICH offers material customization services tailored to the specific media and temperature requirements of automotive applications.
- We provide dimensional customization services, covering an outer diameter range of 0.3 mm to 30 mm and a wall thickness range of 0.08 mm to 5 mm, as well as customized tolerance specifications.
- We also offer customized surface treatments, including bright annealing, electropolishing, pickling and passivation, and external surface color marking.
Manufacture process
Chemical Composition
| Grade | C (%) | Mn (%) | P (%) | S (%) | Si (%) | Cr (%) | Ni (%) | Mo (%) | Nb/Ti (%) |
| TP201 | ≤0.15 | 5.5–7.5 | ≤0.06 | ≤0.03 | ≤1.00 | 16.0–18.0 | 3.5–5.5 | - | - |
| TP304L | ≤0.035 | ≤2.00 | ≤0.045 | ≤0.030 | ≤0.75 | 18.0–20.0 | 8.0–12.0 | - | - |
| TP316L | ≤0.035 | ≤2.00 | ≤0.045 | ≤0.030 | ≤0.75 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | - |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
| Requirement | ≥ 515 | ≥ 205 | ≥ 35 | ≤ 90 (for austenitic grades) |
Possible Alternative Grades
- For high-temperature applications exceeding 450°C-such as automotive exhaust systems and turbocharger piping-TP321 is a suitable choice, particularly in cases where post-weld solution treatment is not feasible.
- For high-pressure automotive hydraulic systems and harsh environments exposed to road salts or moisture, Duplex 2205 is the preferred option.
- For automotive exhaust systems, ferritic stainless steels such as 409 and 439 may be selected; these offer lower costs while providing excellent oxidation resistance.
applications areas
The application of ASTM A269 welded stainless steel capillary tubing within the automotive industry spans multiple core systems throughout the entire vehicle:
- Engine Fuel Systems: Gasoline Direct Injection (GDI) and Diesel Common Rail systems, fuel return lines, high-pressure fuel delivery micro-tubes, etc.
- Braking Systems: Hydraulic brake fluid, transmission lines, and tubing for ABS/ESC hydraulic control units.
- Engine Auxiliary Systems: Oil cooler lines, as well as cooling water and oil lines for turbochargers.
- Sensors and Instrumentation: Pressure sensors, temperature sensors, instrumentation tubing systems, etc.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: Is the weld strength reliable?
A: Yes. Precision TIG welding combined with multi-pass cold rolling ensures a full metallurgical bond, delivering mechanical properties equivalent to the base material. All tubes undergo 100% non-destructive testing, meeting strict automotive reliability standards.
Q: What tube end processing services are available?
A: We provide precision cutting, chamfering, deburring, flaring, swaging, upsetting, threading, and end-fitting welding.
Q: Do the products meet automotive environmental regulations?
A: Yes. Manufacturing complies with ISO 14001:2015, with zero hazardous emissions or wastewater discharge. Products also meet RoHS 2015/863/EU requirements for automotive applications.
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