Products Description
Product Specifications
| Standards | ASTM A269 / ASME SA269 |
| Steel Grades | TP316(UNS S31600),TP316L(UNS S31603) |
| Equivalent Standards | EN 1.4401 / 1.4404;JIS SUS316 / SUS316L;GB/T 14976, etc. |
| Outer Diameter (OD) | 3.18 mm – 25.4 mm |
| Wall Thickness (WT) | 0.2 mm – 3 mm |
| Length | Up to 1000 m |
| Surface Treatment | 2B, BA, polished + PVC coated (Custom colors available for identification) |
| Production Process | Cold drawn / cold rolled |
| Condition | BA, A, CW, SR |
PVC coated tubing is manufactured from 316/316L stainless steel, offering excellent resistance to pitting and chloride-ion corrosion. The outer PVC coating protects against abrasion, salt spray, and chemical splashes, prevents galvanic corrosion, and provides electrical insulation.
Available in both welded and seamless configurations, the tubing undergoes cold working. It offers high flexibility with controlled spring-back during bending and resists cracking even under repeated on-site bending and routing. This makes it well-suited for long-term use in high-pressure instrumentation lines, including in environments subject to vibration.
Customized Services
- Fixed-Length Cutting and Coiling: Tubes are cut to the precise, unfolded length required for individual instrument lines or control loops, minimizing the number of field joints and reducing the density of potential leak points.
- Color-Coded PVC Jacketing: PVC jackets in system- or loop-specific colors facilitate on-site identification and maintenance of instrument tubing.
- Tube End Preparation: Processes such as deburring, chamfering, flaring, flanging, and swaging are performed to prepare tubes for use with compression fittings or for welding.
- Surface Finish and Cleanliness Customization: Options include BA (bright annealed) or EP (electropolished) base tubing; for high-purity or semiconductor applications, cleanroom nitrogen purging and double-layer packaging can be specified.
manufacturing process
Chemical Composition
| Element | C | Si | Mn | P | S | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|---|
| TP316 | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 |
| TP316L | ≤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, min. | Yield Strength, min. | Elongation, min. | Hardness, max. |
|---|---|---|---|---|
| TP316 | 515 MPa | 205 MPa | 40% | 217 HBW |
| TP316L | 485 MPa | 170 MPa | 40% | 217 HBW |
Possible Alternative Grades
- For general instrumentation piping in dry, chloride-free, and low-corrosion environments, 304/304L stainless steel is a suitable, lower-cost option, though its corrosion resistance is inferior to that of 316/316L.
- 316Ti (1.4571) offers performance comparable to 316L but is stabilized with titanium; it comes at a slightly higher price point and is well-suited for high-end applications that require resistance to sensitization after welding, alongside strict low-carbon specifications.
- For sampling lines subject to more demanding corrosion requirements-such as those exposed to seawater or strong acids-904L or 2205 duplex stainless steel may be selected, though these materials are significantly more expensive than 316L.
application areas
- Instrumentation Signals and Pneumatic Lines: Air/gas signal transmission lines for transmitters, controllers, and analytical instruments
- Hydraulic and Control Systems: Low- to medium-pressure hydraulic control loops, and supply/return lines for valve actuators
- Chemical Injection and Sampling Lines: Applications such as chemical injection, process analysis sampling, and flue gas monitoring
- Semiconductor and High-Purity Gas: Ultra-high-purity gas delivery and high-purity piping systems
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Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: Which should be chosen for coiled tubing applications: 316 or 316L?
A: While both grades share the same mechanical property requirements in the annealed state, the core difference lies in their carbon content. If subsequent processes involve welding, brazing, localized thermal processing (such as during tube bending), or if there is a risk of sensitization at intermediate temperatures, 316L (with a carbon content of ≤ 0.035%) is the preferred choice.
Q: What is the operating temperature range for a PVC coating?
A: The long-term service temperature for PVC is generally lower than that of the stainless steel substrate. For typical flexible or semi-rigid PVC coatings, the upper limit for continuous use is in the range of 60–70 °C, depending on the specific formulation and coating thickness.
Q: What is the purpose of a PVC coating?
A: A PVC coating serves to protect the outer surface from abrasion, provide a barrier against salt spray and chemical splashes, prevent galvanic corrosion, and offer a degree of electrical insulation. It does not provide corrosion protection for the medium flowing inside the tube; that function is handled by the stainless steel substrate itself.
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