Products Description
Product Specifications
| Standards | ASTM A632 / ASME SA632 |
| Steel Grades | TP304 TP304L TP310 TP316 TP316L TP317 TP321 TP347 TP348 |
| Equivalent Standards | EN 10216-5, JIS G3459, DIN 17456 |
| Outer Diameter (OD) | 1.27mm – 12.7mm |
| Wall Thickness (WT) | 0.13 mm – 1.65 mm |
| Length | 1 m – 12 m,customized available |
| Surface Treatment | Bright Annealed |
| Production Process | Cold-Drawn/Cold-Rolled |
| Condition | Solution annealed |
Manufactured using a cold-drawing process, our Ss Stainless Capillary Tube is free from the risks of weld corrosion and leakage, making it ideally suited for high-pressure instrumentation applications within chemical plants.
Capable of stable operation over a temperature range of -200°C to 500°C, the tubing has been verified by ASTM A262 testing to be free from intergranular corrosion.
Compared to welded stainless steel tubing, our seamless tubes feature a structure devoid of weld defects, offering superior uniformity in mechanical properties and enhanced resistance to impact and deformation.
Customized Services
- TORICH offers fixed-length cutting with a tolerance of ±0.2 mm, performed in accordance with engineering drawings. We provide end-finishing services, including square cutting, automated deburring, 37° single flaring, and surface preparation for ferrule-type fittings.
- We offer customized surface treatments, such as EP (Electropolishing) to achieve a surface roughness of Ra ≤ 0.2 μm, as well as mirror polishing.
- We support seamless pre-bending and forming services, and offer customized end treatments including chamfering, threading, and the attachment of various connection fittings (ferrule-type, weld-type, and flared-type).
Chemical Composition
| Element | Carbon | Manganese | Silicon | Phosphorus | Sulfur | Chromium | Nickel | Molybdenum | Titanium |
| SS304 | ≤0.08% | ≤2.0% | ≤1.0% | ≤0.045% | ≤0.030% | 18.0–20.0% | 8.0–10.5% | – | – |
| SS316 | ≤0.08% | ≤2.0% | ≤1.0% | ≤0.045% | ≤0.030% | 16.0–18.0% | 10.0–14.0% | 2.0–3.0% | – |
| SS321 | ≤0.08% | ≤2.0% | ≤1.0% | ≤0.045% | ≤0.030% | 17.0–19.0% | 9.0–12.0% | – | ≥5×C |
Mechanical Properties
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) | Elastic Modulus (GPa) |
| SS304 | 215–250 | 515–750 | 40–50 | 201–217 | 193 |
| SS316 | 205–290 | 515–750 | 40–50 | 217–248 | 193 |
| SS321 | 205–250 | 515–750 | 40–50 | 217–248 | 193 |
Physical Properties
| Grade | Density (g/cm³) | Melting Point (°C) | Thermal Conductivity (W/m·K) | Specific Heat (J/g·K) | Electrical Resistivity (μΩ·cm) |
| SS304 | 7.93 | 1400–1450 | 16.2 | 0.500 | 72 |
| SS316 | 7.98 | 1375–1400 | 16.3 | 0.500 | 74 |
| SS321 | 7.98 | 1375–1400 | 17.0 | 0.500 | 74 |
Possible Alternative Grades
- For demanding operating conditions involving high temperatures and high concentrations of strong acids, TP317 may be selected as an alternative to 316 for use in strong-acid sampling or effluent analysis lines.
- For environments subject to marine atmospheric corrosion-such as instrumentation tubing utilizing seawater cooling in chemical plants-Duplex Stainless Steel 2205 is recommended, offering superior corrosion resistance and excellent high-pressure bearing capacity.
- For pressure impulse lines required to withstand rigorous welding processes or subject to alternating thermal cycles, TP347 may be selected as an alternative to 321.
application areas
- Safety Instrumented Systems (SIS) - Impulse Lines and Differential Pressure Transmitter Process Lines for Chemical Production
- Process Analytical Technology (PAT) - Sampling and Pretreatment Capillary Tubing
- Analytical Instrumentation - Precision Connection Tubing for Gas/Liquid Chromatography, Mass Spectrometry, and Similar Devices
- High-Pressure Micro-Reactor Systems - Injection Tubing for Hydrocracking and Polymerization Reactions
- High-Temperature Reactors and Cryogenic Tank Farms - Remote Impulse Signal Tubing for Instrumentation
- Pneumatic Control Loops and Actuators - Instrument Air Supply Lines
- Fiber Optic Sensors - Armored Protection Tubing and Electromagnetic Shielding Sleeves
- Offshore Platforms and Coastal Chemical Plants - Salt-Mist Corrosion-Resistant Instrumentation Tubing
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Products Package
FAQ
Q: What is the minimum achievable outer diameter? What is the wall thickness tolerance?
A: Our seamless capillary tubing features a minimum outer diameter of 1.27 mm and a minimum wall thickness of 0.13 mm. The wall thickness tolerance can typically be controlled within ±10% of the nominal wall thickness.
Q: Can you supply seamless capillary tubing in coiled form? What is the maximum length available?
A: Yes. Our seamless tubing can be produced in continuous coils exceeding 500 meters in length. This minimizes the need for field butt-welds, making it ideal for use in chemical plants as long-distance instrumentation conduit and impulse lines.
Q: Do you provide quality inspection reports and material certificates?
A: Yes. A comprehensive Material Test Certificate (MTC) is provided with every batch of products. This certificate covers various inspection items-including chemical composition, mechanical properties, hydrostatic testing, and eddy current testing-and fully complies with the requirements of the ASTM A632 standard.
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