Products Description
Product Specifications
| Standards |
ASTM A269/A269M |
| Steel Grades | TP304 / UNS S30400 |
| Equivalent Standards | EN 10216-5 1.4301, DIN X5CrNi18-10, JIS G3459 SUS304 |
| Outer Diameter (OD) | 5 mm – 114.3 mm |
| Wall Thickness (WT) | 0.3 mm – 6 mm |
| Length | 6/12 m, customized |
| Surface Treatment | Bright Annealed |
| Production Process | Cold-rolled / Cold-drawn |
| Condition | Solution-annealed |
ASTM A269 304 seamless precision stainless steel pipe is manufactured in strict accordance with the ASTM A269 standard; in the annealed state, it exhibits a tensile strength of at least 515 MPa and a yield strength of at least 205 MPa. Its reference working pressure can reach approximately 20 MPa-far exceeding the typical 0.1–0.5 MPa operating range of electric vehicle liquid cooling systems-thereby providing a substantial safety margin.
Grade 304 austenitic stainless steel demonstrates excellent compatibility with ethylene glycol-water coolant mixtures, deionized water, low-conductivity coolants, and common cooling system additives, effectively resisting both internal coolant corrosion and external exposure to road salt spray and moisture.
Unlike PA12 nylon tubing, 304 stainless steel tubing is unaffected by high-temperature aging, maintains dimensional stability, and exhibits no degradation in long-term pressure resistance, making it ideal for high-temperature, high-reliability circuits such as those found in battery packs and electric drive units.
Customized Services
- Precision Cutting to Length: Precision cutting performed according to customer drawings, with length tolerances controlled within ±0.5 mm; cut-face perpendicularity and burr height are controlled to meet automotive OEM standards.
- End Forming: Services include flaring, swaging, bulging, grooving, flanging, crimping, and corrugation forming, compatible with quick-connect fittings, crimp fittings, and O-ring sealing designs.
- CNC Precision Tube Bending: Capable of multi-angle, multi-plane 3D bending; minimum bend radius is typically 1.5×OD, with guaranteed control over internal diameter roundness and cross-sectional deformation after bending.
- Surface Treatment: Options include Bright Annealing (BA), Pickling and Passivation (AP), and Electropolishing (EP), as well as internal ultrasonic cleaning and nitrogen purging.
Chemical Composition
| Element | Carbon | Manganese | Phosphorus | Sulfur | Silicon | Chromium | Nickel |
| Composition (%) | 0.08 max | 2.00 max | 0.045 max | 0.03 max | 1.00 max | 18.0–20.0 | 8.0–10.5 |
Mechanical Properties
| Property | Tensile Strength | Yield Strength | Elongation | Hardness |
| Value | 520–750 MPa | ≥205 MPa | ≥40% | ≤95 |
Physical Properties
| Properties | Density | Melting Point | Thermal Conductivity | Specific Heat Capacity |
| Values | 8.0 g/cm³ | 1400 - 1450°C | 16.2 W/m·K | 500 J/kg·K |
Possible Alternative Grades
- For applications where welded fittings or brackets are required at the ends of piping, TP304L is a suitable choice, as it minimizes the risk of intergranular corrosion following welding or high-temperature processing.
- For new energy vehicles operating in extremely cold, highly humid, or coastal environments, 316L is recommended, as it offers significantly superior corrosion resistance compared to 304 stainless steel.
- For components located near the high-temperature zones of electric drive systems, the high-temperature side of heat pump systems, or fast-charging cooling circuits, TP321 is an option; it supports long-term operation at temperatures exceeding approximately 450°C, though it comes at a higher cost.
Applications areas
ASTM A269 304 seamless precision stainless steel pipe is specifically tailored for thermal management applications in new energy vehicles, with the following specific use cases:
- EV battery thermal management systems (BTMS)
- Battery cooling plates and coolant piping
- Electric motor cooling circuits
- Inverter and power electronics cooling
- Heat pump and HVAC refrigerant systems
- Fuel cell vehicle thermal management
- Automotive heat exchanger assemblies
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Polishing equipment
Cold drawing equipment
Products Package
FAQ
Q: Can the tubing withstand corrosion from coolants used in new energy vehicles?
A: Yes, absolutely. Standard 304 austenitic stainless steel offers long-term resistance to mainstream automotive coolants such as ethylene glycol and propylene glycol. Testing has shown no corrosion or scaling after 5,000 hours of salt spray and coolant immersion, making it suitable for long-term automotive use.
Q: What level of inner surface roughness can be achieved?
A: For bright-annealed tubing, inner surface roughness can be controlled at Ra ≤ 0.8 μm; electropolishing allows it to reach Ra ≤ 0.4 μm. For battery cooling systems requiring low particle counts and minimal surface adhesion, we recommend electropolishing (EP) combined with ultrasonic cleaning.
Q: Does the product support secondary processing such as bending and flaring?
A: Yes. The tubing features excellent toughness and elongation properties, allowing for precision bending, flaring, swaging, and flanging without cracking or deformation. Custom-shaped tubing can be produced to meet specific requirements and fit various automotive installation configurations.
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