Products description
Product Specifications
| Standards | ASTM A269 / ASME SA269 |
| Steel Grades | 304, 304L, 316, 316L, 321,etc. |
| Equivalent Standards | EN 10217-7, ISO 1127, ASTM A632, JIS G3459 |
| Outer Diameter (OD) | 0.3 mm – 6 mm |
| Wall Thickness (WT) | 0.1 mm – 1.5 mm |
| Length | 6/12 m |
| Surface Treatment | Bright annealed |
| Production Process | TIG / Cold Drawn / Cold Rolled |
| Condition | Available in annealed, bright-annealed, and work-hardened. |
Compared to ordinary carbon steel, stainless steel capillary pipe withstands corrosion from harsh media-such as oils and greases found in construction machinery, rainwater, mild acids and alkalis, and damp, dusty environments-making it suitable for demanding conditions in outdoor, mining, and heavy vehicle applications; it passes 500-hour salt spray testing without showing signs of rust.
The tubing is manufactured using precision cold-rolling or cold-drawing processes, achieving outer diameter tolerances of ±0.03 mm to ±0.05 mm and wall thickness tolerances of ±10% or ±0.02 mm. In the bright-annealed state, the inner surface roughness is Ra ≤ 0.8 μm; following electropolishing or mechanical polishing, it reaches Ra ≤ 0.4 μm.
Customized Services
- TORICH offers secondary processing services such as precision bending, flaring, swaging, cutting, chamfering, grinding, and hole punching; we can customize shaped tubing-including U-shapes, L-shapes, and rings-to match specific equipment piping layouts.
- We support customization for non-standard dimensions and provide fixed-length cutting for straight tubes or coils, ensuring a length tolerance of ±0.1 mm and burr-free end faces.
- Surface treatment options include pickling and passivation, bright annealing, mechanical polishing of the outer surface, and electropolishing of both inner and outer surfaces.
manufacture process
Chemical Composition
| Element | C | Si | Mn | P | S | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|---|
| 316L Composition (%) | ≤0.030 | ≤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 | Yield Strength (0.2% Offset) | Elongation | Hardness HRB | Density | Modulus of Elasticity |
|---|---|---|---|---|---|---|
| Requirement | ≥485 MPa | ≥170 MPa | ≥35% | ≤90 | 7.99 g/cm³ | Approximately 193 GPa |
Possible Alternative Grades
For instrumentation and measurement tubing in construction machinery, while TP316L is the primary recommendation, suitable alternative grades may be selected based on specific operating conditions, the medium involved, and cost considerations.
- TP304/TP304L offers the most economical alternative. It is suitable for general indoor hydraulic, pneumatic, and lubrication circuits where the medium is free from highly corrosive agents such as chloride ions, salt spray, or urea.
- TP316Ti combines the corrosion resistance of 316L with the benefits of titanium stabilization, making it an effective alternative to 316L for high-temperature applications involving chlorides or requiring superior weldability.
- 904L and S31254 are suitable for environments with extreme chloride ion concentrations, acidic conditions, or the presence of bromine; however, because they cost significantly more than standard instrumentation tubing, they are typically reserved for applications involving highly corrosive media.
Application areas
- Construction Machinery: Hydraulic pressure gauges and oil pressure sensor lines for excavators, loaders, cranes, road rollers, and other construction vehicles
- Precision Temperature Measurement Equipment: Temperature control sensors, thermowells (probe protection tubes), and precision temperature-sensing impulse lines for construction machinery
- Automated Measurement and Control Systems: Intelligent control systems, onboard precision detection modules, and signal transmission micro-tubing for construction machinery
- Fluid Sampling and Testing Equipment: Precision sampling and measurement lines for hydraulic oil, lubricating oil, and cooling media in construction machinery
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Polishing equipment
Cold drawing equipment
Products Package
FAQ
Q: How should one choose between welded and seamless tubing for instrumentation lines?
A: After bright annealing, welded tubing features a uniform weld microstructure, a smooth inner surface, and high dimensional accuracy. It is more cost-effective than seamless tubing and is suitable for instrumentation lines in most construction machinery. We recommend seamless tubing for ultra-high-pressure applications.
Q: Can you perform end processing, flaring, or bending based on customer drawings?
A: Yes. We offer custom processing services, including cut-to-length, deburring, 37°/45° flaring, ferrule pre-assembly, U-bends, serpentine bends, coiled tubing, and welded fittings.
Q: Do the product's dimensional tolerances meet the requirements for high-precision instrumentation?
A: Absolutely. We achieve outer diameter tolerances of ±0.03mm and wall thickness tolerances of ±0.02mm, with ultra-high-precision custom options reaching ±0.01mm, making them suitable for various high-end precision measuring instruments used in construction machinery.
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