Products Description
Our Advantages
1. Surface Quality
- Electropolished pipe undergoes an electropolishing process to remove microscopic protrusions, burrs, and processing residues from the pipe surface, ensuring smooth fluid flow and suitability for high-purity systems.
- The pipes are inspected using endoscopes and Ra measurements to ensure smooth and clean inner and outer surfaces, with a surface roughness Ra ≤ 0.4 μm.
2. Precise Dimensions
- Our pipes utilize precision cold drawing and online laser diameter measurement throughout the process, resulting in dimensional tolerances far superior to ordinary stainless steel pipes. Small diameter pipes have an outer diameter tolerance of ±0.03mm, wall thickness tolerance of ±0.02mm, roundness deviation ≤0.05mm, and straightness ≤0.8mm/m.
- Before electropolishing, the welds of our welded pipes are ground and pre-polished to ensure the weld seam is flush with the pipe surface.
3. Corrosion Resistance
- Electropolished pipe is made from low-carbon stainless steel materials such as 304L, 316L, and 317L, offering excellent corrosion resistance and reducing the risk of intergranular corrosion.
- The electropolishing process forms a stable passivation film, enhancing the corrosion resistance of the pipes. Spectrometer testing ensures that the materials used meet ASTM standards.
4. Quality Control
- The pipes undergo mechanical performance testing, hydrostatic pressure testing, and eddy current testing to ensure that there are no internal defects or leakage risks.
- After polishing, the pipes undergo rigorous cleaning and cleanliness verification testing to ensure they meet cleanroom, pharmaceutical, or ultra-high purity standards.
5. Customized Services
- We support non-standard customization, including custom inner surface roughness, ranging from the standard Ra ≤ 0.8 μm to ultra-smooth Ra ≤ 0.15 μm, which is suitable for semiconductor, pharmaceutical, and biotechnology systems.
- We support custom end finishing such as chamfering, beveling, and other port customizations, as well as interface customization to fit international standard precision connectors, avoiding secondary processing.
application areas
- Semiconductor and electronics industries: Used in ultrapure water (UPW), chemical delivery, and high-purity gas distribution lines.
- Pharmaceutical and biotechnology processing: Used in purified water (PW), water for injection (WFI), clean steam, and process fluid delivery systems.
- Chemical industry: Used in fine chemical plants, specialty chemical production, and chemical delivery pipelines.
- Precision instruments: Commonly used in instrumentation tubing, signal transmission lines, and fluid or gas sampling systems.
Chemical Composition
| Element | C | Si | Mn | P | S | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|---|
| 304L | ≤0.03 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 18.0–20.0 | 8.0–12.0 | - |
| 316L | ≤0.03 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 |
| 904L | ≤0.02 | ≤1.00 | ≤2.00 | ≤0.045 | ≤0.035 | 19.0–23.0 | 23.0–28.0 | 4.0–5.0 |
Mechanical Properties
| Property | Tensile Strength (MPa) | Yield Strength 0.2% (MPa) | Elongation (%) | Hardness (HB) |
| 304L | ≥485 | ≥170 | ≥40 | ≤95 HRB |
| 316L | ≥485 | ≥170 | ≥40 | ≤95 HRB |
| 904L | ≥490 | ≥220 | ≥35 | ≤90 HRB |
Possible Alternative Grades
| Alternative Grades | Reasons |
| 317L | This material can be used as an alternative when the performance of 316L stainless steel is insufficient and the full use of 904L stainless steel is not economical, and is suitable for chemical processing and specialized pharmaceutical fields. |
| 2205 | It possesses higher mechanical strength and stronger resistance to stress corrosion cracking, and is used in high-pressure systems and marine or offshore environments with severe chloride exposure. |
| Incoloy 825 | It has high corrosion resistance and is suitable for highly corrosive chemical environments such as strong acids, mixed halides, or high-temperature corrosive media. |
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: What surface roughness (Ra) can be achieved through electropolishing?
A: Electropolishing can improve the internal surface roughness from a standard application Ra ≤ 0.8 μm to Ra ≤ 0.15 μm for ultra-high purity systems. External surface finishes can also be customized to bright, mirror, or brushed effects.
Q: What level of cleanliness can your tubing achieve?
A: Our tubing can be cleaned to high-purity standards, including particle-free inner surfaces, low ionic contamination, and compliance with SEMI, USP, or FDA requirements, making it suitable for pharmaceutical, biotechnology, and semiconductor applications.
Q: What material grades are available?
A: Common grades include 304, 304L, 316, 316L, 317L, 904L, and duplex stainless steel. Custom alloys are available to meet specific chemical, pressure, or hygienic requirements.
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