Products Description
Product Specifications
| Standards | ASTM A632 |
| Steel Grades | TP304, TP304L, TP316, TP316L, TP317, TP321, TP347 |
| Equivalent Standards | EN 10216-5 / JIS G3448 |
| Outer Diameter (OD) | 0.3mm-12.7mm |
| Wall Thickness (WT) | 0.05mm-1.25mm |
| Length | 1 m – 6 m (Straight ), 50 m – 300 m (Coiled ),or customized |
| Surface Treatment | Bright Annealed |
| Production Process | Cold Drawn / Precision Welded |
| Condition | Solution Annealed & Quenched |
These stainless steel capillary tubes are precision-manufactured with an outer diameter tolerance controlled to ±0.01 mm, a wall thickness tolerance of ±0.005 mm, and an inner wall roughness of Ra ≤ 0.8 μm (BA grade). They are ideally suited for applications requiring extremely high flow precision-such as oil and gas sampling and chemical injection systems.
The tubing features a maximum working pressure of up to 35 MPa and a burst pressure of ≥ 87.5 MPa, thereby meeting the demands of high-pressure downhole operating conditions. Having undergone rigorous hydrostatic testing and eddy current flaw detection, the tubes are certified to be free of leaks and defects, fully complying with the inspection requirements of the ASTM A632 standard.
Customized Services
- TORICH maintains a dedicated technical team capable of customizing material grades and dimensions to meet specific client requirements regarding operating conditions, corrosion levels, pressure, and temperature.
- We offer customized pipe end finishes tailored to installation requirements, including custom beveling (at angles of 30°, 45°, or 60°), threaded ends (such as NPT and BSPT), and sealed ends.
- We also provide a range of surface treatments, including pickling and passivation, zinc plating followed by passivation, PTFE coating, and electropolishing.
application areas
- Instrumentation: Suitable for pressure transmitter tubing, impulse tubes, thermocouple wire, and flowmeter impulse lines.
- Medical and Pharmaceutical: Hypodermic needles, catheters, surgical instrument components, fluid transfer and sampling lines in pharmaceutical equipment, etc.
- Chemical and Petrochemical Processing: Sampling lines in corrosive or acidic process streams, analyzer connections, and control instrumentation.
- Oil and Gas: Hydraulic control lines and chemical injection in oil wells.
- Automotive: Fuel injection systems, brake and clutch hydraulic systems, lubrication and cooling systems, etc.
Chemical Composition
| Element | C (%) | Mn (%) | P (%) | S (%) | Si (%) | Cr (%) | Ni (%) | Mo (%) | Nb/Ti (%) |
| TP304 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.03 | ≤1.00 | 18.0–20.0 | 8.0–11.0 | - | - |
| TP317 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.03 | ≤1.00 | 18.0–20.0 | 11.0–15.0 | 3.0–4.0 | - |
| TP347 | ≤0.08 | ≤2.00 | ≤0.045 | ≤0.03 | ≤1.00 | 17.0–19.0 | 9.0–13.0 | - | Nb ≥10×C |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength 0.2% (MPa) | Elongation (%) | Hardness (HB) |
| TP304 | ≥520 | ≥205 | ≥35 | 90 |
| TP317 | ≥515 | ≥205 | ≥35 | 90 |
| TP347 | ≥515 | ≥205 | ≥35 | 90 |
Possible Alternative Grades
- For moderately corrosive environments-such as surface piping on offshore platforms or the transport of mildly acidic media in refining and chemical processing-TP316 is a suitable choice, covering a temperature range of -100°C to 400°C.
- For sour gas wells and conditions involving extreme corrosion, UNS N06625 is recommended, as it exhibits high resistance to H₂S, CO₂, and acidic environments.
- For scenarios involving extreme corrosion-such as deep-sea oil and gas extraction or the transport of strongly acidic media in refining and chemical processing-2205 duplex stainless steel is the preferred material. With a Pitting Resistance Equivalent Number (PREN) of 38 or higher, it offers superior performance compared to austenitic stainless steels.
application areas
Thanks to their exceptional corrosion resistance, precise dimensional accuracy, and stable mechanical properties, ASTM A632 stainless steel capillary tubes are widely used across the oil and gas industry, including drilling, production, transmission, and refining operations. Specific applications include:
- Drilling Operations: Downhole drilling fluid sampling tubes, drilling instrumentation sensor lines, and drilling rig hydraulic control lines.
- Oil Production: Downhole chemical injection tubes, production well pressure monitoring lines, and well fluid sampling tubes.
- Gas Transmission: Natural gas pipeline branch lines, gas sampling tubes, and gas station instrumentation control lines.
- Refining & Petrochemicals: Process fluid sampling tubes, acidic media transport lines, and refining equipment instrumentation lines.
- Offshore Oil & Gas Platforms: Platform hydraulic control lines, seawater cooling line branches, offshore oil and gas sampling tubes, etc.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: Is it suitable for low-temperature applications?
A: Yes, it is suitable for temperatures as low as -325°F (-200°C).
Q: Does it hold relevant certifications for the oil and gas industry? Can you provide test reports?
A: We can provide comprehensive Material Test Certificates (MTCs) and test reports (covering chemical composition, mechanical properties, non-destructive testing, and corrosion testing). We also welcome on-site inspections by clients or re-inspections by third parties to ensure full compliance with the regulatory requirements of the oil and gas industry.
Q: What are the dimensional tolerances for the tubing? Is it possible to customize for even tighter tolerances?
A: Standard tolerances are: Outer Diameter ±0.01 mm and Wall Thickness ±0.005 mm. We also offer custom precision-grade tolerances of Outer Diameter ±0.005 mm and Wall Thickness ±0.003 mm; specific tolerance requirements must be communicated in advance for such customization.
Hot Tags: stainless steel capillary, China, suppliers, manufacturers, factory, customized, wholesale, price, OEM, mill, producer, for sale
