Why do TP316L stainless steel tubes still encounter issues such as surface contamination, bending cracks, or poor installation fit in chemical, pharmaceutical, or fluid handling systems-even when the correct material is selected? The key lies in whether the pickling and passivation quality, material condition, and dimensional accuracy truly meet engineering requirements.
Our ASTM A269 TP316L Stainless Steel Annealed Pickled Tubing is specifically designed for highly corrosive environments. All TP316L tubes undergo professional pickling treatment to completely remove oxide scale and heat treatment residues, followed by passivation to form a stable and dense պաշտպան oxide layer on the surface. This significantly enhances corrosion resistance, especially in chloride-containing or mildly acidic media, reducing corrosion failure rates by approximately 25%.
In terms of mechanical properties, ASTM A269 TP316L stainless steel tubes are processed through solution annealing, with hardness strictly controlled at ≤HRB 90. This ensures excellent ductility and bending performance. The tubes can meet demanding cold bending and flaring requirements, effectively preventing cracking or deformation during fabrication and installation.
Regarding dimensional accuracy, we strictly comply with ASTM A269 standards, controlling outer diameter tolerance within ±0.2%–0.3% and maintaining wall thickness uniformity within ±10%. This ensures excellent fit during assembly, minimizing installation errors and reducing sealing risks.
Chemical Composition of Stainless Steel 316L Tubes
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | Fe |
| SS 316L | 0.035 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 16.00 - 18.00 | 2.00 - 3.00 | 10.00 - 14.00 | 68.89 min |
Physical Properties of Stainless Steel 316L Tubes
Grade |
Density (kg/m3) |
Elastic Modulus (GPa) |
Mean Co-eff of Thermal Expansion (µm/m/°C) | Thermal Conductivity (W/m.K) |
Specific Heat 0-100°C (J/kg.K) |
Elec Resistivity (nΩ.m) |
|||
| 0-100°C | 0-315°C | 0-538°C | At 100°C | At 500°C | |||||
| 316/L/H | 8000 | 193 | 15.9 | 16.2 | 17.5 | 16.3 | 21.5 | 500 | 740 |
ASTM A269 TP 316L Stainless Steel Tubing Dimension Tolerances
| OD, in. [mm] | Wall thickness tolerances, in. [mm] | Wall thickness totlerances, in. [mm] | Length, in. [mm] |
|---|---|---|---|
| Up to 1⁄2 [13] | ±0.005 [0.13] | ±15 | Wall thickness tolerances, in. [mm] |
| 1⁄2 to 11⁄2 [13 to 38], excl | ±0.005 [0.13] | ±10 | +1⁄8 [3.2] |
| 11⁄2 to 31⁄2 [38 to 89], excl | ±0.010 [0.25] | ±10 | +3⁄16 [4.8] |
| 31⁄2 to 51⁄2 [89 to 140], excl | ±0.015 [0.38] | ±10 | +3⁄16 [4.8] |
| 51⁄2 to 8 [140 to 203], excl | ±0.030 [0.76] | ±10 | +3⁄16 [4.8] |
| 8to 12 [203 to 305], excl | ±0.040 [1.01] | ±10 | +3⁄16 [4.8] |
| 12 to 14 [305 to 356], excl | ±0.050 [1.26] | ±10 | +3⁄16 [4.8] |
ASTM A269 TP 316L Stainless Steel Tubing Sizes
| Tube OD in . | Tube Wall in . | Weight lb/ft | Working Pressure psig |
|---|---|---|---|
| 1/8 | 0 .028 | 0 .029 | 8 500 |
| 0 .035 | 0 .080 | 5 100 | |
| 1/4 | 0 .049 | 0 .105 | 7 500 |
| 0 .065 | 0 .128 | 10 200 | |
| 0 .035 | 0 .127 | 3 300 | |
| 3/8 | 0 .049 | 0 .171 | 4 800 |
| 0 .065 | 0 .215 | 6 500 | |
| 1/2 | 0 .035➀ | 0 .174 | 2 600 |
| 0 .049 | 0 .236 | 3 700 | |
| 0 .065 | 0 .302 | 5 100 | |
| 5/8 | 0 .065 | 0 .389 | 4 000 |
| 3/4 | 0 .065 | 0 .476 | 3 300 |
What dimensional tolerances are available?
According to ASTM A269, tubing is supplied with tight tolerances. For precision applications, OD tolerance can be controlled within ±0.05 mm, and wall thickness within ±10%, depending on manufacturing capability.
Is the tubing suitable for bending and fabrication?
Yes. Due to controlled annealing and low hardness, TP316L tubing offers excellent ductility. It supports tight-radius bending without cracking, making it suitable for complex piping layouts and instrumentation systems.
GNEE possesses nearly 18 years of extensive experience in the production of seamless stainless steel tubes. Every tube undergoes rigorous inspection, covering multiple stages including dimensional accuracy, surface finish, PMI (Positive Material Identification), eddy current testing, and hydrostatic testing.
Our product range encompasses both Imperial and Metric series, with outer diameters ranging from 1.58 mm to 108 mm. Furthermore, we offer custom sizing services to meet the specific requirements of our clients.
Material Grades: 304/304L, 304H, 316/316L, 316H, 317L, 321, 310S (2520), 347H, S31803/S32205, S32750, S32760, S32304, 904L
Applicable Standards: ASTM A269, A270, A789, A790
Outer Diameter Range: 1.58 mm – 108 mm
Wall Thickness Range: 0.38 mm – 5.18 mm
Length Specifications: Up to 25 meters (U-bending processing available)
Surface Finish: A&P (Annealed & Pickled), BA (Bright Annealed), EP (Electropolished)
Packaging and Protection
Given the highly delicate surface finish of BA tubes, the quality of the packaging directly determines the condition of the goods upon arrival.
Individual Packaging: Each tube must be enclosed in a separate plastic sleeve.
End Protection: Robust plastic end caps must be fitted to prevent deformation of the tube ends and internal contamination.
Outer Packaging: Fumigation-free plywood crates must be used.
