ASTM A270 TP316L Hygienic Stainless Steel Tubing
Outer Diameter: 1/2" – 8" (12.7 mm – 203.2 mm)
Wall Thickness: 1.2 mm – 3.05 mm
Surface Roughness: Inner Surface (ID) Ra ≤ 0.4 µm (BA/EP); Outer Surface (OD) Ra ≤ 0.8 µm
Inspection & Certification: 100% Eddy Current Testing (ET), Hydrostatic Testing, PMI/Spectroscopic Re-verification, 3A / EN 10204 3.1 MTC
Packaging: Protective plastic end caps, individual bagging, and reinforced, moisture-proof wooden crates designed for export
What is ASTM A270 TP316L Hygienic Stainless Steel Tubing?
ASTM A270 TP316L hygienic stainless steel tubing contains 16.0%-18.0% Cr+10.0%-14.0% Ni+2.0%-3.0% Mo, offering superior pitting and intergranular corrosion resistance compared to standard TP304. With a pitting resistance equivalent number (PREN) of 23-25, it effectively resists chemical attack from high-concentration chloride ions and CIP/SIP sterilization media in dairy, biopharmaceutical, and food processing applications. ASTM A270 TP316L tubing features ultra-low internal surface roughness (ID Ra down to ≤0.4um/15uin), which, through bright annealing (BA) or electropolishing (EP) processes, completely eliminates microscopic dead zones for media residue and bacterial growth, strictly complying with ASTM A270, 3A, and ASME BPE sanitary standards.
ASTM A270 TP316L Stainless Steel Tubing Suppliers and Manufacturers
As a professional stainless steel supplier, GNEE reliably supplies TP316L seamless tubes (Seamless), automatic welded tubes (Welded), and heavily cold worked tubes (HCW) compliant with ASTM A270/A270M and 3A certification. We stock inventory with outside diameters from 1/2 in. (12.7 mm) to 8 in. (203.2 mm) and wall thicknesses from 1.2 mm to 3.05 mm, with a standard delivery length of 20 ft (6.096 m) or custom precision cutting upon request. The internal polishing roughness is precisely controlled within Ra 0.2 um– 0.8 um (covering 180#, 240#, 320#, and electropolished EP). Every batch undergoes 100% eddy current testing (ET)/hydrostatic testing and air tightness testing, accompanied by EN 10204 3.1 Material Test Certificates (MTC).
Could you please let me know:
What are the required outer diameter (OD) and wall thickness (or specifications)?
What are the surface finish requirements (Ra value or grit size) for your process?
316L Sanitary Stainless Steel Tube Specification
Chemical composition of ASTM A270 TP316L sanitary pipe
| ASTM A270 TP 316L TUBE | UNS | Ni | C | Cr | Mn | P | S | Si | Mo |
|---|---|---|---|---|---|---|---|---|---|
| ASTM A270 TP316L | S31603 | 10.0-14.0 | 0.035 | 16.0-18.0 | 2 | 0.045 | 0.03 | 1 | 2.0-3.0 |
Mechanical Properties of ASTM A270 TP316L Sanitary Stainless Steel Tube
| Material | Heat | Yield Strength | Tensile Strength | Temperure | Elongation %, Min |
|---|---|---|---|---|---|
| Treatment | Ksi (MPa), Min. | Ksi (MPa), Min. | Min. | ||
| º F(º C) | |||||
| ASME A270 TP316L | Solution | 25(170) | 70(485) | 1900 (1040) | 35 |
Surface Finish Specifications (Ra Values)
Surface finish is the most critical aspect of ASTM A270. Roughness is measured as Roughness Average (Ra).
| Finish Category | Internal Surface (ID) Ra | External Surface (OD) Ra | Common Industry Term |
| Mechanical Polish (MP) | ≤ 0.51 μm (20 μin) | ≤ 0.80 μm (32 μin) | 180 / 240 Grit |
| Mechanical Polish (MP) | ≤ 0.80 μm (32 μin) | ≤ 0.80 μm (32 μin) | 150 / 180 Grit |
| Electropolished (EP) | ≤ 0.38 μm (15 μin) | ≤ 0.80 μm (32 μin) | ASME BPE SF4 |
| Unpolished | Mill Finish | Mill Finish | Bright Annealed (BA) |
ASTM A270 Standard Dimensions (Common Sizes)
| Nominal Size (OD) | Wall Thickness (16 Ga) | Internal Diameter (ID) |
| 0.50" (12.7 mm) | 0.065" (1.65 mm) | 0.370" (9.40 mm) |
| 1.00" (25.4 mm) | 0.065" (1.65 mm) | 0.870" (22.10 mm) |
| 1.50" (38.1 mm) | 0.065" (1.65 mm) | 1.370" (34.80 mm) |
| 2.00" (50.8 mm) | 0.065" (1.65 mm) | 1.870" (47.50 mm) |
| 3.00" (76.2 mm) | 0.065" (1.65 mm) | 2.870" (72.90 mm) |
| 4.00" (101.6 mm) | 0.083" (2.11 mm) | 3.834" (97.38 mm) |
aSTM A270 Dimensional Tolerances
Sanitary tubing requires tighter tolerances than standard industrial pipe for compatible orbital welding.
| Outside Diameter (OD) | OD Tolerance | Wall Thickness (WT) Tolerance |
| ≤ 1.000" (25.4 mm) | ± 0.005" (0.13 mm) | ± 12.5% |
| 1.500" – 2.000" | ± 0.008" (0.20 mm) | ± 12.5% |
| 2.500" – 3.000" | ± 0.010" (0.25 mm) | ± 12.5% |
| 4.000" (101.6 mm) | ± 0.015" (0.38 mm) | ± 12.5% |
ASTM A270 TP316L Stainless Tubing HS Code
| Item | Details |
|---|---|
| Product | ASTM A270 TP316L Hygienic Stainless Steel Tubing |
| Material | TP316L / UNS S31603 / 1.4404 |
| HS Code | 7306.40 |
Quality Control
| Test Item | Purpose |
| Reverse Flattening Test | Verifies weld ductility and ensures no cracks or lack of fusion. |
| Hydrostatic / Eddy Current | 100% testing to ensure leak-free integrity. |
| Surface Roughness Test | Profilometer measurement of Ra values on ID and OD. |
| Visual Inspection | Ensures surface is free from pits, scratches, and discoloration. |
| Dimensional Check | Verifies OD, WT, and Ovality for orbital welding fit-up. |
High-quality packaging
Standard: PE end caps (both ends) + stretch wrap + wooden crate/pallet; Large diameter: Wooden crate + moisture protection; BPE grade: Inner PE layer + outer wooden crate + desiccant.
FAQ
What is 3-A certification?
It is issued by 3-A SSI (Sanitary Standards, Inc.) for dairy and similar sanitary equipment. The tubing itself does not require "certification," but the manufacturer must pass a 3-A audit. Suppliers should be asked to provide a 3-A audit certificate upon purchase.
What is the MOQ?
Stock sizes (1/2″–4″, 16Ga, 4 ft): Starts at 1 piece; Non-stock/custom lengths: Usually starts at 500–1,000 ft; Large diameters (6″–12″): Quoted per project.
What is the lead time?
Stock sizes: 3–7 days; Non-stock: 30–45 days; EP grade: 45–60 days.
How do I choose the Ra value?
Food & Beverage (general): Ra ≤ 0.8 μm (32 μin); Dairy/Pharmaceutical: Ra ≤ 0.5 μm (20 μin); Aseptic/Bioprocessing (BPE): Ra ≤ 0.4 μm (15 μin) + Electropolishing. OD usually requires ≤ 0.8 μm (32 μin).
What is the difference between mechanical polishing and electropolishing (EP)?
Mechanical polishing: Ra 0.4–0.8 μm, lower cost, suitable for food-grade applications;
Electropolishing (EP): Ra ≤ 0.2–0.4 μm, removes microscopic pores, suitable for pharmaceutical/aseptic applications. EP costs 30–50% more than mechanical polishing.
What is the difference between A270 and BPE tubing?
A270: Ra ≤ 0.8 μm (32 μin) ID, meets 3-A / FDA standards;
BPE (ASME BPE): Ra ≤ 0.5 μm (20 μin) ID + Electropolishing, meets cGMP / aseptic pharmaceutical standards.
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