EP-TUBING short for Electro Polished Stainless Steel Tube / Pipe
With the smoothest finish in the industry for conveying liquids or gases. Typically produced by seamless bright annealed tube or pipe, the TIG welding tube also available.
The ID is supplied with an electropolished finish of 10Ra (0.25µm) or smoother. Advantages of Ding Ten’s electropolished tube/pipe:
2.Improved chrome/iron ratio ≥ 1.5
3.Improved carbon layer thickness ≤ 10 Angstroms
4.Improved CrO/FeO ≥ 2.2
5.SEM Defect Counts ≤ 40
6.Smoothest finished, Mirro-like
7.Enhance flow characteristics
8.Improved product purity
Alloys: Stainless steel 304, 304L and VOD316L, Vim+Var 316L
Size Range: O.D. 1/4" to 6" (6.35-165.2mm)
Specification: ASTM A249, A269, A270, 3A and BPE standard, JIS G3447. G3459
Special or non-standard sizes available upon request
Minimum Order: Negotiable
Electropolished (EP) Tubing
For applications with surface finish requirements well beyond the quality realized in a standard mill finish, PAC maintains an inventory of electropolished tubing (EP) in diameters ranging from 1/8” through 1”. Through submersion in an electrically charged electrolyte solution bath, a smooth uniform surface is created by dissolving imperfections. This process removes any contamination on, or just below, the tube’s surface and passivates it, bolstering the corrosion resistance of the steel
The pharmaceutical, petro-chemical, food & beverage and semi-conductor industries all contain utilizations where fine smoothing of the tube is critical for heightened cleanliness, the removal of occluded gases or friction reduction imperatives.
Stocked in a 316/316L chemistry with a maximum hardness of RB 90, the surface finish of the tube internal surface is certified to have a maximum roughness of 10 micro-inches Ra. The governing specifications for EP tubing are ASTM A269, A632 and A1016.
In ISO Class 4 clean room conditions, each tube is purged with ultra high purity (UHP) nitrogen and then capped and double bagged. Certification qualifying the tubing’s production standards, chemical composition, material traceability and maximum surface roughness is provided for all material.
EP is a method to polish metal surface that dissolves the surface of product by passing direct current in electrolytic solution. Therefore it is able to remove pollutions such as scales, sticking chips, abrasive grains which is not able to remove by only Super Micro Cleaning (SMC). Moreover the smooth surface is provided and reduces “real” surface area. And finally, EP treatment forms a uniform oxidized layer (passivation film) which prevents outgassing from inside of metals. Of course, cleaning after EP is SMC. We send products for you in the cleanest condition!
Material: 304/304L, 316/316L, 321, etc.
Tube delivery condition: electropolish (EP)
Tube type: seamless, no welds of any kind
Standard: ASTM A269, A213, EN10216-5, etc.
O.D. from 6 to 25.4mm
W.T. from 0.71 to 2.11mm
in accordance with DIN EN 10216-5 respectively ASTM A269
Mechanical and technical properties:
in accordance to DIN EN 10216-5 respectively ASTM A269
Soft annealed max. Hardness 150 HV10 Tolerance +10 points
Model type and surface integrity:
in accordance with 10216-5, ASTM 269
Surface roughness Ra < 0.2 μm
Cleanliness of the tubes:
bore cleanliness in accordance to DIN 8905. The coils shall be dry, clean and free from swarf, drawn and roller marks.
Pressure Test:100% tested at the appropriate pressure stated under water/air.
Tolerance: D4/T4, max +/- 0.05mm