High Purity Tubing & Ultra-high Purity Stainless Steel Tubing for the transport of gases,316L UHP tube
Ultra-high Purity Stainless Steel Tubing
and fittings are characterized by the highest surface quality in terms of roughness and purity. Through a monitored and reproducible electropolishing process and by measuring the ratio of chromium oxide to iron oxide, we guarantee optimum corrosion protection.
OUR UHP tube are Rinsed with 0.1 µm-filtered,
18 M𝛀∙cm DI water heated to 60°C; purged with heated
and filtered nitrogen
Ultra High Purity tube (UHP) is always refering to a stainless tube with electropolished
Our UHP tube are specially developed for the transport of UHP gases in the semiconductor and fine chemistry industries.
OUR UHP tube Packing:Ends are capped; tubes are individually double bagged, then bulk bagged in an ISO Class 4 clean room
| Name | Ultrahigh-Purity (UHP) and High-Purity Stainless Steel Tubing |
| ASTM A213, ASTM A269, ASTM A312, EN10216-5, GB/T14976-2012 | |
| Steel Grade | SS304/SS304L, SS316/SS316L |
| Size | OD:3-50.8mm, wall thickness: 0.5-4mm |
| Length | 4m,6m or customized |
| Delivery Conditions | BA(Bright Annealed), Mechanical Polished, Electro-polished( EP) |
| Features | Bright Annealed for finished tube, high cleanness and high precision of inside and outside surface, good mechanical properties, excellent cold bending ability, high temperature resistant and anti-oxidation. We also provide polishing and pipe cutting service |
| Applications | specially developed for the transport of UHP gases in the semiconductor and fine chemistry industries. Applications include:
|
| Packing | Plastic film & Knitting Bundled, Plywood Case or as request |
| Delivery Time | 30-60days after order confirmed |
2. Chemical Composition of Ultrahigh-Purity (UHP) and High-Purity Stainless Steel Tubing
| Grade | C | Si | Mn | P | S | Cr | Ni |
| 304 | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | ≤18.0-20.0 | ≤8.0-10.5 |
| 304L | ≤0.030 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | ≤18.0-20.0 | ≤8.0-10.5 |
| Grade | C | Si | Mn | P | S | Cr | Ni | others |
| SUS316 | ≤0.08 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 16.0~18.0 | 10.0~14.0 | Mo:2~3 |
| SUS316L | ≤0.03 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 16.0~18.0 | 12.0~15.0 | Mo:2~3 |
3. Mechanical Properties&Hardness of Ultrahigh-Purity (UHP) and High-Purity Stainless Steel Tubing
| Grade | YS(Mpa) | TS(Mpa) | EL(%) | Hv |
| 304 | ≥205 | ≥520 | ≥40 | ≤200 |
| 304L | ≥175 | ≥480 | ≥40 | ≤200 |
| Grade | YS(Mpa) | TS(Mpa) | EL(%) | Hv |
| SUS316 | ≥205 | ≥520 | ≥40 | ≤200 |
| SUS316L | ≥175 | ≥480 | ≥40 | ≤200 |
4. Production Flow Chart: Key Procedures Descriptions:
Cold Rolling
Tube rolling uses compression to reduce the size of seamless tubes. It utilizes one or two sets of rolls with
constant cross-section grooves on the circumference of the tube. The rolls are driven by rack and pinion gears
of different radii along profiled cams, completing multiple 360º rotations around the tube
Tube rolling is a very precise method of reducing very thin walled and/or smaller diameter tubes, and is often
used as the final cold working step. By rolling, we’re able to achieve exceptional control over dimensional tolerances
and surface finish while also minimizing material loss and improving the metal’s microstructure.
Cold Drawing
Cold drawing reduces the diameter by pulling the tube through a die that is smaller than the tube. In order to fit
the tube into the die, one end is swaged thereby reducing the diameter of the leading end before drawing.
Next, the narrowed end is passed through the die and clamped to a drawing trolley which pulls the tube through the die.
Annealing
Annealing is used to soften the metal before further cold working or fabrication processes, and improves the
overall metallurgical microstructure of the tube. During tube reduction or cold drawing, it can become hard and
somewhat brittle. To be able to draw the tube again, stresses formed during cold working need to be removed to
return the material to its normal state.
During annealing the tube is heated to a controlled temperature and soak time. Through this process the tube
remains in shape, but the grains in the structure of the tube reform into a regular unstressed pattern. The resulting
annealed tube is softer and suitable for redrawing
Straightening
Drawing and annealing generally results in some degree of bowing, producing a slight bend in the tubing. In order to
make the tubes straight, we use multiple roll mechanical straighteners to implement this procedure, Straightening can
introduce slight changes to the size and mechanical properties of the tubing, so these aspects are very carefully controlled
during the process.
5. Inspection and Tests
We inspect all lots of tubing before shipment to ensure that every aspect of the customer’s order has been met.
Our in-house inspection and tests capabilities include:
- Chemical Composition Test
- Visual inspection
- Dimensional inspection
- Surface roughness testing
- Eddy Current testing
- Hydrostatic pressure testing
- Destructive mechanical testing:
– Yield Strength
– Tensile Strength
– Elongation
– Hardness testing
– bending, flattening, and flaring
All shipments include a full Test Certificate showing all required test results and verifying compliance with the order requirements.
