Products Description
Product Specifications
| Standards | JIS G3447 |
| Steel Grades | SUS304, SUS304L, SUS316, SUS316L |
| Equivalent Standards | ASTM A269,ASTM A632,EN 10217-7 |
| Outer Diameter (OD) | 0.5 mm – 20 mm |
| Wall Thickness (WT) | 0.08 mm – 2 mm |
| Length | 1-6m, up to 12m (customizable) |
| Surface Treatment | Bright Annealed |
| Production Process | TIG/Laser Welding |
| Condition | Bright Annealed, Soft Annealed |
Stainless steel materials-such as SUS304 and SUS316L-demonstrate performance far superior to that of copper or carbon steel tubing in humid, weakly acidic, and chlorine-containing environments. Our stainless capillary tube is manufactured using a combination of multi-roll cold rolling and precision welding, achieving a dimensional accuracy of up to 0.2%.
The entire production process adheres to rigorous cleanliness protocols; the tubes feature surfaces free of oil stains, impurities, and oxide layers, while their inner walls remain free of residue-thereby meeting the stringent cleanliness standards required by the instrumentation industry.
Customized Services
- TORICH offers precision cutting services tailored to customer specifications, including end-face treatments such as internal and external chamfering, pointing, rounding, swaging, and flaring.
- We provide precision tube bending services-including U-shapes, S-shapes, and coils-executed strictly in accordance with engineering drawings; we also perform slotting, punching, and flattening operations.
- Surface finish options include Bright Annealing (BA), Mechanical Polishing (MP), and Electropolishing (EP); for instrumentation signal tubing, additional demagnetization or low-permeability treatments are available upon request.
- Products can be supplied in various temper conditions-Soft, Medium-Hard, or Hard-to accommodate diverse bending requirements or high-pressure strength applications.
manufacturing process
Chemical Composition
| Element | C (%) | Si (%) | Mn (%) | P (%) | S (%) | Cr (%) | Ni (%) | Mo (%) | Ti (%) |
|---|---|---|---|---|---|---|---|---|---|
| SUS304 | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 18.0–20.0 | 8.0–10.5 | - | - |
| SUS304L | ≤0.03 | ≤1.00 | ≤2.00 | ≤2.00 | ≤0.045 | 18.0–20.0 | 8.0–12.0 | - | - |
| SUS316 | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | - |
| SUS316L | ≤0.03 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | - |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness |
|---|---|---|---|---|
| SUS304 | ≥520 | ≥205 | ≥35 | ≤90 HRB |
| SUS304L | ≥480 | ≥175 | ≥35 | ≤90 HRB |
| SUS316 | ≥520 | ≥205 | ≥35 | ≤95 HRB |
| SUS316L | ≥480 | ≥175 | ≥35 | ≤95 HRB |
Possible Alternative Grades
- For high-temperature sensor assemblies operating continuously at temperatures exceeding 500°C, SUS321 is a suitable choice.
- For offshore instrumentation, aggressive chemical processing environments, or high-pressure systems requiring exceptional strength and resistance to stress corrosion, Duplex 2205 is recommended.
- 254SMO offers extremely high corrosion resistance, making it ideal for seawater desalination, chemical processing, and ultra-high-pressure systems.
application areas
JIS G3447 precision welded stainless capillary tube is primarily utilized in sensors and instrumentation for the following specific applications:
- Pressure Sensor and Transmitter Systems: Pressure-sensing impulse lines, differential pressure measurement lines, etc.
- Temperature Measurement Systems: Thermocouple protection tubes, furnace temperature monitoring lines, etc.
- Flow Measurement and Control Systems: Flowmeter sensing tubes, gas and liquid flow sampling tubes, etc.
- Gas Analysis and Sampling Systems: Gas analyzer inlet tubes, laboratory gas sampling probes, etc.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: Can the dimensional tolerances meet the requirements for high-precision sensors?
A: Yes. Our standard tolerances for tubing are ±0.01 mm to ±0.03 mm for outer diameter, and ±0.005 mm to ±0.02 mm for wall thickness. The inner surface roughness is Ra ≤ 0.4 μm. We can also customize even tighter tolerances-down to a minimum of ±0.005 mm-based on specific customer requirements.
Q: Is it possible to perform secondary processing, such as bending or cutting?
A: Yes. After undergoing annealing treatment, the tubing exhibits excellent machinability, allowing for various secondary processing operations such as bending, cutting, swaging, and chamfering. The bending radius can be customized according to the outer diameter.
Q: How do you ensure the cleanliness of the capillary tubing?
A: Prior to shipment, the tubing undergoes either Bright Annealing (BA) or a rigorous degreasing, pickling, and purification treatment to ensure that both the inner and outer surfaces are free from oil residues and particulate contaminants.
Hot Tags: stainless capillary tube, China, suppliers, manufacturers, factory, customized, wholesale, price, OEM, mill, producer, for sale
