Stainless Steel 316 Electropolished Seamless Tubes Manufacturer in India
Stainless Steel 316 Electropolished Seamless Tubes Manufacturer in India
Sachiya Steel International makes Stainless Steel 316 Electropolished Seamless Tubes for lines that must stay clean, resist chlorides and survive years of cleaning and sterilising. Established in 2005, we are a Stainless Steel 316 Electropolished Seamless Tubes Manufacturer in India, with a facility near Mumbai and an export office in Mumbai. Grade 316 adds molybdenum to stainless steel, and electropolishing leaves the surface smooth, bright and easy to sanitise.
We supply grades 316, 316L and 316Ti (UNS S31600, S31603 and S31635), used in pharmaceutical, biotech, food, beverage, semiconductor and chemical plants. With ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018 certifications, along with PED 2014/68/EU and TUV approvals, we focus on consistent quality and clear documentation. Popular sizes sit in ready stock, subject to availability, and we ship to 85+ countries.
What Are Stainless Steel 316 Electropolished Seamless Tubes?
Stainless steel 316 electropolished seamless tubes are seamless tubes made from 316 austenitic stainless steel that have been electropolished to give a smooth, clean, corrosion-resistant surface.
Two things make them work:
- The steel: 316 holds about 16% to 18% chromium, 10% to 14% nickel and 2% to 3% molybdenum. The molybdenum raises resistance to pitting and crevice corrosion in chlorides, with a pitting resistance equivalent number (PREN) of about 24, against about 19 for 304.
- The finish: electropolishing dissolves a thin layer of metal in an acid bath under electric current. It removes peaks, burrs and embedded iron and leaves a chromium-rich surface film.
The tube itself is cold drawn from a pierced billet and solution annealed, so it has no weld seam and an even wall. Tubes can be electropolished on the outside (OD), the inside (ID) or both. The result is a surface with less area for bacteria and product residue to hold on to, and that cleans faster in clean-in-place (CIP) and sterilise-in-place (SIP) cycles.
Stainless Steel 316 Electropolished Seamless Tubes
High-quality industrial pipes and tubes manufactured for demanding applications across chemical, petrochemical, power generation, marine, construction and engineering industries. Available in multiple materials, sizes, wall thicknesses and manufacturing specifications.
Types of Stainless Steel 316 Electropolished Seamless Tubes
Stainless Steel 316 Electropolished Seamless Tubes are available in different grades, surface finishes, and sizes for pharmaceutical, chemical, food processing, and other industrial applications. A Stainless Steel 316 Electropolished Seamless Tubes Manufacturer offers options to suit varying requirements for corrosion resistance, surface cleanliness, and operating temperatures.
- 316 Electropolished Tubes (S31600): Suitable for chemical processing, marine equipment, and industrial fluid systems.
- 316L Electropolished Tubes (S31603): Low-carbon tubes commonly used in welded equipment and hygienic process lines.
- 316Ti Electropolished Tubes (S31635): Titanium-stabilised tubes designed for applications involving elevated temperatures.
- ID and OD Electropolished Tubes: Both internal and external surfaces receive polishing for a smooth finish.
- ID Electropolished Tubes: Feature a polished internal bore for product-contact and fluid-transfer applications.
- OD Electropolished Tubes: Feature a polished exterior for exposed installations and cleanroom equipment.
- ASME BPE Tubes: Available with specified dimensions and surface finishes for bioprocessing systems.
- Instrumentation and Process Tubes: Used in sampling lines, gas systems, fluid transfer, and clean-in-place (CIP) applications.
- Capped and Sleeved Tubes: Protective end caps and sleeves help prevent scratches and contamination during handling and transport.
316, 316L and 316Ti Stainless Steel Electropolished Seamless Tubes Manufacturers and Suppliers in India
Stainless Steel 316 electropolished seamless tubes are available in different grades to meet industrial requirements for corrosion resistance, surface cleanliness, and high-temperature performance. Each grade offers specific properties suited to different operating conditions.
- Grade 316 (UNS S31600, 1.4401): Contains molybdenum for improved resistance to chloride corrosion and many industrial chemicals.
- Grade 316L (UNS S31603, 1.4404): Features a low carbon content that helps reduce sensitisation after welding. Dual-certified 316/316L material is also available.
- Grade 316L (1.4435): Offers a controlled chemical composition and higher nickel content for pharmaceutical and biotechnology applications.
- Grade 316Ti (UNS S31635, 1.4571): Contains titanium to improve resistance to sensitisation during elevated-temperature exposure.
- ID and OD Electropolishing: Internal and external surfaces are polished to meet cleanliness and finish requirements.
- Surface Roughness Options: Maximum Ra values of 0.5 µm, 0.38 µm, and 0.25 µm are available according to specifications.
Tubes can be supplied in different outside diameters, wall thicknesses, and lengths to suit specific project requirements.
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→Get CertifiedStainless Steel 316 Electropolished Seamless Tubes Factory Prices
Stainless Steel 316 Electropolished Seamless Tubes Specification
The table sets out the working specification.
| Item | Detail |
|---|---|
| Product | Stainless Steel 316 Electropolished Seamless Tubes |
| Grades | 316 (S31600), 316L (S31603), 316Ti (S31635) |
| Process | Seamless, cold drawn, solution annealed, then electropolished |
| Tube standards | ASTM A269 / ASME SA269, ASTM A213 / ASME SA213, ASTM A270, EN 10216-5 |
| General requirements | ASTM A1016 |
| Size reference | OD 6.35 to 76.2 mm in the tables, other sizes on request |
| Wall thickness | BWG gauge or mm, as per drawing |
| Length | Fixed or cut length |
| Ends | Plain, cut square, deburred and capped |
| Heat treatment | Solution annealed |
| Surface | Electropolished OD, ID or both, Ra to specification |
| Tests | Chemical analysis, tensile, hardness, flattening, flaring, hydrostatic or eddy current test; Ra measurement, bore inspection and ferroxyl test on request |
| Certificate | EN 10204 3.1 with every order, 3.2 on request |
| Inspection | Third-party inspection on request |
| Packing | End caps and protective sleeves |
Stainless Steel 316 Electropolished Seamless Tubes Standards and Specifications
Electropolished tube is bought to a tube standard for the steel and a finishing standard for the surface. The table links each one to its job.
| Standard | Covers | Applies to |
|---|---|---|
| ASTM A269 / ASME SA269 | Seamless and welded austenitic stainless steel tubing for general service | Process and instrumentation tube |
| ASTM A213 / ASME SA213 | Seamless austenitic stainless steel boiler, superheater and heat-exchanger tubes | Heat-exchange and pressure tube |
| ASTM A270 | Seamless and welded austenitic and ferritic/austenitic stainless steel sanitary tubing | Food and dairy sanitary tube |
| EN 10216-5 | Seamless stainless steel tubes for pressure purposes | European grades 1.4401, 1.4404, 1.4571 |
| ASTM A1016 | General requirements for stainless steel tubes | Tolerances and test rules |
| ASTM B912 | Passivation of stainless steels using electropolishing | Electropolished finish |
| ASTM A967 | Chemical passivation treatments for stainless steel parts | Passivation test methods |
| ASTM A380 | Cleaning, descaling and passivation of stainless steel parts | Cleanliness and ferroxyl test |
| ASME BPE | Bioprocessing equipment | Pharmaceutical and biotech surface finish |
| ISO 2037, DIN 11850 | Stainless steel tubes for the food industry | Food and beverage tube |
| ASME B46.1 | Surface texture, roughness, waviness and lay | Ra measurement |
| SEMI F19 | Surface condition of wetted stainless steel components | Semiconductor clean service |
| EN 10204 | Types of inspection documents | 3.1 and 3.2 certificates |
Stainless Steel 316 Electropolished Seamless Tubes Material and Grades
Pick the grade by the cleanliness level, welding method and temperature. The table lists the 316 grades with their UNS and EN numbers.
| Grade | UNS | EN number | EN name | Typical use |
|---|---|---|---|---|
| 316 | S31600 | 1.4401 | X5CrNiMo17-12-2 | Food, chemical, general clean service |
| 316L | S31603 | 1.4404 | X2CrNiMo17-12-2 | Pharmaceutical, biotech, welded lines |
| 316L (high Ni) | S31603 | 1.4435 | X2CrNiMo18-14-3 | Pharmaceutical and biotech systems |
| 316Ti | S31635 | 1.4571 | X6CrNiMoTi17-12-2 | Higher-temperature chemical service |
What Is the Difference Between Stainless Steel 316 Electropolished Seamless Tubes and Mechanically Polished Seamless Tubes?
The short answer: electropolishing removes metal and levels the surface, while mechanical polishing grinds and smears it. The electropolished tube is smoother at the microscopic level, cleaner and more corrosion resistant. Choose electropolished tube for pharmaceutical, biotech and sanitary lines, and mechanically polished tube where appearance matters but cleanliness does not.
| Point | Electropolished 316 Tubes | Mechanically Polished 316 Tubes |
|---|---|---|
| How the surface is made | Anodic dissolution in acid under current | Abrasive grinding and buffing |
| Surface at microscopic level | Smooth, with peaks removed | Scratched, with smeared metal and grit |
| Surface roughness (Ra) | Lowered further than the starting finish | Depends on grit used |
| Embedded iron and particles | Removed | Can remain |
| Chromium-rich oxide layer | Yes, improved | Not improved |
| Corrosion resistance | Higher | Lower |
| Cleanability (CIP / SIP) | Excellent | Fair |
| Bore (ID) finish | Possible on long, small-bore tubes | Hard to reach on small bores |
| Cost | Higher | Lower |
| Typical use | Pharmaceutical, biotech, sanitary lines | Decorative and general lines |
Stainless Steel 316 Electropolished Seamless Tubes Chemical Composition
Chemistry sets the corrosion resistance of the tube before electropolishing begins. The table shows the ASTM A269 and A213 limits, one element per row. Values are percentage by weight, maximum unless shown as a range or marked "min".
| Element | 316 (S31600) | 316L (S31603) | 316Ti (S31635) |
|---|---|---|---|
| Carbon (C) | 0.08 | 0.035 | 0.08 |
| Manganese (Mn) | 2.00 | 2.00 | 2.00 |
| Phosphorus (P) | 0.045 | 0.045 | 0.045 |
| Sulphur (S) | 0.030 | 0.030 | 0.030 |
| Silicon (Si) | 1.00 | 1.00 | 0.75 |
| Chromium (Cr) | 16.0–18.0 | 16.0–18.0 | 16.0–18.0 |
| Nickel (Ni) | 10.0–14.0 | 10.0–15.0 | 10.0–14.0 |
| Molybdenum (Mo) | 2.00–3.00 | 2.00–3.00 | 2.00–3.00 |
| Nitrogen (N) | — | — | 0.10 |
| Titanium (Ti) | — | — | 5×(C+N) min, 0.70 max |
Stainless Steel 316 Electropolished Seamless Tubes Mechanical Properties
Mechanical properties come from the base 316 tube, and electropolishing does not change them. The table gives minimum values and typical physical data, one property per row.
| Property | 316 | 316L | 316Ti |
|---|---|---|---|
| Tensile strength, MPa (ksi) | 515 (75) | 485 (70) | 515 (75) |
| Yield strength 0.2%, MPa (ksi) | 205 (30) | 170 (25) | 205 (30) |
| Elongation (%) | 35 | 35 | 35 |
| Hardness, max | 90 HRB (192 HBW) | 90 HRB (192 HBW) | 90 HRB (192 HBW) |
| Density (g/cm³) | 7.98 | 7.98 | 7.98 |
| Melting range (°C) | 1375–1400 | 1375–1400 | 1375–1400 |
| Thermal conductivity at 100 °C (W/m·K) | 16.3 | 16.3 | 16.3 |
| Modulus of elasticity (GPa) | 193 | 193 | 193 |
Stainless Steel 316 Electropolished Seamless Tubes Size and Weight Chart
Weight depends on OD and wall thickness. 316 stainless steel has a density of about 7.98 g/cm³, so we use this formula:
OD and wall are in mm. Example: 1/2 in OD, 16 BWG (1.65 mm) is (12.70 − 1.65) × 1.65 × 0.02507 = 0.457 kg/m. Multiply by length for total weight. Electropolishing removes only a very thin layer, so the weight changes by a negligible amount.
| OD (in) | OD (mm) | 18 BWG, 1.24 mm (kg/m) | 16 BWG, 1.65 mm (kg/m) | 14 BWG, 2.11 mm (kg/m) | 12 BWG, 2.77 mm (kg/m) |
|---|---|---|---|---|---|
| 1/4" | 6.35 | 0.159 | 0.194 | — | — |
| 3/8" | 9.53 | 0.258 | 0.326 | 0.393 | — |
| 1/2" | 12.70 | 0.356 | 0.457 | 0.560 | 0.690 |
| 3/4" | 19.05 | 0.554 | 0.720 | 0.896 | 1.131 |
| 1" | 25.40 | 0.751 | 0.982 | 1.232 | 1.572 |
| 1-1/2" | 38.10 | 1.146 | 1.508 | 1.904 | 2.453 |
| 2" | 50.80 | 1.541 | 2.033 | 2.576 | 3.335 |
| 2-1/2" | 63.50 | 1.935 | 2.558 | 3.247 | 4.217 |
| 3" | 76.20 | 2.330 | 3.084 | 3.919 | 5.099 |
Available Sizes, Dimensions and Tolerances
Stainless Steel 316 Electropolished Seamless Tubes are ordered by OD and wall thickness, with the wall given in BWG gauge or in mm. Instrumentation tube starts at 6.35 mm OD, and process tube runs up to 76.2 mm OD in common walls. Other ODs, metric walls and lengths can be quoted on request. A higher BWG number means a thinner wall.
| BWG | Wall (in) | Wall (mm) |
|---|---|---|
| 12 | 0.109 | 2.77 |
| 14 | 0.083 | 2.11 |
| 16 | 0.065 | 1.65 |
| 18 | 0.049 | 1.24 |
| 20 | 0.035 | 0.89 |
Common OD and wall pairs for clean process tube are 1/2 in × 1.65 mm, 3/4 in × 1.65 mm, 1 in × 1.65 mm, 1-1/2 in × 1.65 mm, 2 in × 1.65 mm, 2-1/2 in × 1.65 mm and 3 in × 1.65 mm, with 2.11 mm on request for pressure or higher corrosion allowance. Tolerances on OD, wall and length follow ASTM A269 or A213 together with ASTM A1016, and electropolishing removes a thin surface layer, so quote the final dimensions you need.
Common Materials in Stainless Steel 316 Electropolished Seamless Tubes
Selecting the right stainless steel grade depends on the operating temperature, welding requirements, and cleanliness standards of the application. Different 316-series materials offer specific properties for pharmaceutical, chemical, and hygienic processing systems.
316 (S31600, 1.4401): Contains chromium, nickel, and molybdenum to provide corrosion resistance in chloride-containing environments.
316L (S31603, 1.4404): Its low carbon content makes it suitable for welded equipment and pharmaceutical processing lines.
316L (1.4435): Features higher nickel and molybdenum content, making it suitable for applications requiring controlled material composition.
316Ti (S31635, 1.4571): Titanium-stabilised stainless steel intended for chemical processing and elevated-temperature service.
Dual-Certified 316/316L: Meets the requirements of both grades, offering flexibility for clean-process piping systems.
Stainless Steel 316 Electropolished Seamless Tubes Suppliers offer these material options in different diameters, wall thicknesses, lengths, and electropolished finishes to meet specific project requirements.
Stainless Steel 316 Electropolished Seamless Tubes We Manufacture and Supply
We make Stainless Steel 316 Electropolished Seamless Tubes for the jobs below. The finish and wall follow the product, the cleaning method and the code.
| Line | Typical grade | Typical finish |
|---|---|---|
| Purified water and clean steam utilities | 316L | ID and OD electropolished |
| Bioreactor, buffer and media lines | 316L (1.4435) | ID and OD electropolished |
| Pharmaceutical process and CIP lines | 316L | ID electropolished |
| Food, dairy and beverage product lines | 316, 316L | ID electropolished |
| Semiconductor process gas and chemical lines | 316L | ID and OD electropolished |
| Instrumentation and sampling lines | 316L | ID electropolished, small bore |
| Heated chemical process lines | 316Ti | ID and OD electropolished |
Applications of Stainless Steel 316 Electropolished Seamless Tubes
- Pharmaceutical industry: Purified water, clean steam and process lines.
- Biotech plants: Buffer, media, bioreactor and clean-in-place lines.
- Food and dairy processing: Product and CIP lines that need a cleanable surface.
- Beverage and brewing: Wort, beer, juice and soft-drink lines.
- Semiconductor plants: Process gas and chemical delivery lines.
- Cosmetics and personal care: Product transfer and mixing lines.
- Chemical processing: Clean, chloride-bearing and mild-acid lines.
- Laboratory and analytical equipment: Sample lines and instrument tubing.
- Marine and coastal plants: Instrumentation lines exposed to salt air.
- Medical equipment manufacturing: Clean fluid and gas lines.
Why Choose Us as Your Stainless Steel 316 Electropolished Seamless Tubes Manufacturer in India?
With experience in the pipes and tubes industry since 2005, we understand the material quality, surface finish, and dimensional accuracy required for Stainless Steel 316 Electropolished Seamless Tubes. Our manufacturing and export capabilities support orders of up to 100 metric tons per month, with supplies reaching 85+ countries worldwide.
We offer Grades 316, 316L, 316L (1.4435), and 316Ti in different outside diameters, wall thicknesses, and lengths, with ID and OD electropolished finishes to meet project specifications.
Our quality credentials include ISO 9001:2015, ISO 14001:2015, ISO 45001:2018, PED 2014/68/EU, and TÜV approvals. Every order comes with an EN 10204 3.1 material test certificate, while 3.2 certification and third-party inspection can be arranged on request. We also support material traceability, dimensional checks, export documentation, and protective packaging to help maintain tube quality during international transportation.
Countries We Export Stainless Steel 316 Electropolished Seamless Tubes To
We supply Stainless Steel 316 Electropolished Seamless Tubes from India to 85+ countries worldwide, serving customers in pharmaceutical, chemical, food processing, marine, and other industrial sectors.
Middle East: UAE, Saudi Arabia, Qatar, Oman, Kuwait, and Bahrain.
Europe: Germany, Italy, United Kingdom, France, Netherlands, Spain, and Belgium.
Asia-Pacific: Singapore, Malaysia, Thailand, Indonesia, Vietnam, Japan, South Korea, and Australia.
North and South America: USA, Canada, Mexico, and Brazil.
Africa: South Africa, Egypt, Nigeria, and Kenya.
International orders are supported with EN 10204 3.1 material test certificates, while 3.2 certification and third-party inspection can be arranged on request. Export packaging and shipping documentation are coordinated according to destination and order requirements.
Stainless Steel 316 Electropolished Seamless Tubes FAQs
Common questions about 316 grade selection, electropolishing, surface roughness, CIP/SIP, and supply.
Should I choose 316 or 316L for electropolished tubes?
Choose 316L for pharmaceutical, biotech and any line that is welded, because its low carbon avoids weld decay. Choose 316 for lines that are not welded on site, and 316Ti for higher-temperature chemical service.
What is the difference between 316L 1.4404 and 1.4435?
Grade 1.4435 has more nickel and a little more molybdenum, with tighter limits, so it holds a stable austenitic structure and resists corrosion slightly better. Many pharmaceutical and biotech projects specify it, so state the EN number your specification names.
What surface roughness can I specify?
Specify Ra as a maximum, for example 0.5, 0.38 or 0.25 µm. Lower figures need a smoother starting tube and a longer polish, so tell us the value your project calls for.
Should I order ID, OD or ID and OD electropolished tube?
Order ID-only polish when only the bore touches the product. Order ID and OD polish for the cleanest line, for exposed runs and for cleanrooms.
Can electropolished tubes handle CIP and SIP cycles?
Yes. The smooth surface cleans fast and resists the hot caustic, acid and steam used in cleaning and sterilising. Check the cleaning chemicals, chloride level and temperature against your design basis.
Does electropolishing change the tube size?
It removes a very thin surface layer, normally a few micrometres to tens of micrometres. That has little effect on OD and wall, but quote the final dimensions you need if the tolerance is tight.
How should I weld electropolished tubes?
Use orbital TIG welding with an argon purge on the inside, which gives clean, smooth joints. Remove heat tint on the weld and passivate it after welding to restore the finish.
What sizes and tolerances apply?
The tables above cover OD 6.35 to 76.2 mm in common walls. Tolerances follow ASTM A269 or A213 and ASTM A1016. Other sizes and walls can be quoted on request, and popular sizes sit in ready stock, subject to availability.
How do I calculate the weight of an order?
Use Weight (kg/m) = (OD − Wall) × Wall × 0.02507, with OD and wall in mm. Multiply by length and quantity. Real weight varies slightly with wall tolerance.
Which certificates and tests come with the tubes?
Each order carries an EN 10204 3.1 certificate showing chemistry and mechanical results. A 3.2 certificate, third-party inspection, Ra measurement, bore inspection and a ferroxyl test are available on request.