DONGSHANG Stainless offers ASTM A270 TP316L Sanitary Stainless Steel Tubing that is primarily used in the Bakery, Beverage, Cosmetic, Dairy, Food, or Pharmaceutical industries. Usually mechanically polished or electro-polished on ID and/or OD, other stainless steel grades have 304, 304L, 316, and duplex stainless steel.
ASTM A270’s emphasis is on the surface finish of tubing, which can be specified in many ways to a number of different finishes. Polish tubing meets or exceeds the 3-A standards with an ID polish of 20 Ra on the Inside of the Tube and a 150 Grit or 32 Ra on the Outside of the tube.
Stainless Steel Sanitary Tube Specifications
| Standard | ASTM A270 |
|---|---|
| Roughness | 0.2 – 1.0 um |
| Grades | TP316 / TP316L |
| Surface | Mechanical Polishing |
| Polishing Grit | 180, 240, 320, 400, 600 Grit |
| Outside Diameter | 12.7 Mm – 304 Mm |
| Thickness | 0.5 Mm – 5 Mm |
| Length | 6 M Or Cut To Length |
ASTM A270 TP 316L Stainless Steel
| Grade | C | Si | Mn | Cr | Ni | Mo | S | P |
|---|---|---|---|---|---|---|---|---|
| TP316L | 0.035 | 1.0 | 2 | 16 – 18 | 10 – 15 | 2 – 3 | 0.03 | 0.045 |
ASTM A270 TP316 Sanitary Tubing Tolerances
| OD | Tolerance | WT Tolerance | Length Tolerance |
|---|---|---|---|
| ≤ 25.4mm | ± 0.13mm | ± 12.5% | +1/8″ (3.18) – 0 |
| > 25.4mm, ≤ 50.8mm | ± 0.20mm | ± 12.5% | +1/8″ (3.18) – 0 |
| > 50.8mm, ≤ 76.2mm | ± 0.25mm | ± 12.5% | +1/8″ (3.18) – 0 |
| > 76.2mm, ≤ 101.6mm | ± 0.38mm | ± 12.5% | +1/8″ (3.18) – 0 |
| > 101.6mm, < 139.7mm | ± 0.38mm | ± 12.5% | +4.8mm-0mm |
| > 139.7mm, ≤ 203.2mm | ± 0.76mm | ± 12.5% | +4.8mm-0mm |
| > 203.2mm, < 304.8mm | ± 1.27mm | ± 12.5% | +4.8mm-0mm |
The wall thickness at any point shall not vary more than 12.5 %, from the specified wall thickness, pharmaceutical requirement is a bit tighter.
ASTM A270 TP316 Welded Sanitary Tube
Starting from stainless steel strip or coil, we use an automatic welding process for welded tubes, all tubes shall be furnished in the heat-treated condition, the annealing temperature should be 1040° C minimum, and rapidly quenched, welding bead removed.
Welded sanitary stainless steel tubing is manufactured using automatic TIG welding technology, all the tubing is detected by Eddy current test, weld ends corner cut at 90 degrees to the tube length for automatic welding, tubes are thoroughly rinsed with de-ionized water with no residue, bright annealed with 99.99 percent hydrogen gas at the minimum temperature level of 1040 degrees C and rapidly quenched to achieve the maximum cold-finish effect.
Sanitary Tubing Sizes
| Size OD | Size OD | Nominal Wall Thickness | Nominal Wall Thickness | Outside Diameter Tolerance | Outside Diameter Tolerance | Length Tolerance | Length Tolerance | Wall Thickness Tolerance |
|---|---|---|---|---|---|---|---|---|
| (in) | (mm) | (in) | (mm) | (in) | (mm) | (in) | (mm) | (%) |
| ½ | 12.7 | 0.065 | 1.65 | +/-0.005 | +/-0.13 | +⅛, -0 | +3.18, -0 | +/-10.0% |
| ¾ | 19.1 | 0.065 | 1.65 | +/-0.005 | +/-0.13 | +⅛, -0 | +3.18, -0 | +/-10.0% |
| 1 | 25.4 | 0.065 | 1.65 | +/-0.005 | +/-0.13 | +⅛, -0 | +3.18, -0 | +/-10.0% |
| 1½ | 38.1 | 0.065 | 1.65 | +/-0.008 | +/-0.20 | +⅛, -0 | +3.18, -0 | +/-10.0% |
| 2 | 50.8 | 0.065 | 1.65 | +/-0.008 | +/-0.20 | +⅛, -0 | +3.18, -0 | +/-10.0% |
| 2½ | 63.5 | 0.065 | 1.65 | +/-0.010 | +/-0.25 | +⅛, -0 | +3.18, -0 | +/-10.0% |
| 3 | 76.2 | 0.065 | 1.65 | +/-0.010 | +/-0.25 | +⅛, -0 | +3.18, -0 | +/-10.0% |
| 4 | 101.6 | 0.083 | 2.11 | +/-0.015 | +/-0.38 | +⅛, -0 | +3.18, -0 | +/-10.0% |
| 6 | 152.4 | 0.109 | 2.77 | +/-0.030 | +/-0.76 | +1, -0 | +25.4, -0 | +/-10.0% |
| 8 | 203.2 | 0.109 | 2.77 | +0.061 -0.031 | +1.55 -0.79 | +1, -0 | +25.4, -0 | +/-10.0% |
Testing
Each tube shall be subjected to mechanical tests like reverse flattening test, hydrostatic test, or nondestructive electric test, in practice eddy current testing is the most used testing.
Application Of A270 TP316 Stainless Steel Sanitary Tube
- Pharmaceutical, food, beer, drinking water, beverage industries
- Biological engineering, chemical engineering, pharmaceutical engineering, auto parts
- air purification， seawater desalting equipment
- Precision machinery plant, engine plant, chemical machinery, refrigeration machinery
Annealing
All tubing shall be furnished in the heat-treated condition, Hydrogen bright annealed in line to 1900°F(1040° C) minimum and rapidly quenched.
Surface Finishes
ASTM A270 permits Mill Finish, Mechanically Polished to a variety of grit finishes, or Electropolished ID with Mechanically Polished OD.
The surface finish is 20 Ra ID maximum, 30 Ra OD maximum surface roughness measured with the profilometer reading at 90 degrees to the major polishing pattern. Our polishing techniques result in surface finishes that lead the industry. All tubing is printed with size, alloy, and heat number for full traceability.
Packaging
To ensure sanitary standards, our tubing is packaged using protective sleeving, capped with air-tight plastic end caps. The tubing is then placed in thick cardboard cores and capped securely on each end for maximum protection during shipment. Large quantities will be shipped securely in wood or metal crates.