Stainless Steel 304 Electropolished Seamless Tubes Manufacturer in India
Stainless Steel 304 Electropolished Seamless Tubes Manufacturer in India
Sachiya Steel International is a leading Stainless Steel 304 Electropolished Seamless Tubes Manufacturer in India, manufacturing and supplying pipes and tubes since 2005. We serve industries that require smooth surfaces, easy cleaning and corrosion resistance, including pharmaceutical, biotechnology, food processing, dairy and beverage manufacturing. Our facility is near Mumbai, with an export office in Mumbai, supporting domestic and international customers across 85+ countries.
Our product range includes stainless steel 304, 304L and 304H grades (UNS S30400, S30403 and S30409), subject to specifications and availability. Electropolishing smooths microscopic surface irregularities, helping reduce contaminant build-up and simplify cleaning. Our quality credentials include ISO 9001:2015, ISO 14001:2015, ISO 45001:2018, PED 2014/68/EU and TUV approvals. Every order includes an EN 10204 Type 3.1 certificate, while popular sizes may be available from ready stock, subject to availability.
What Are Stainless Steel 304 Electropolished Seamless Tubes?
Stainless steel 304 electropolished seamless tubes are seamless tubes made from 304 austenitic stainless steel and then electropolished, an electrochemical finishing process that smooths and brightens the metal surface. The tube is first cold drawn from a pierced billet and solution annealed, so it has no weld seam and an even wall. It is then made the anode in a bath of acid electrolyte, normally a mix of phosphoric and sulphuric acid, and a controlled current dissolves a thin layer of metal from the surface. The process works hardest on the high points, so it levels the surface, rounds off micro-burrs and removes embedded iron, scale and smeared metal. What remains is a bright, smooth surface covered with a chromium-rich oxide layer.
Electropolishing differs from mechanical polishing in a simple way. Mechanical polishing drags and smears metal across the surface and can leave grit and fine scratches. Electropolishing removes metal instead, so the surface is cleaner and has no directional marks. Tubes can be electropolished on the outside (OD), the inside (ID) or both.
Stainless Steel 304 Electropolished Seamless Tubes
Stainless Steel 304 Electropolished Seamless Tubes designed for demanding applications across pharmaceutical, food processing, chemical, biotechnology, marine and engineering industries. Available in various sizes, wall thicknesses and surface finishes.
Types of Stainless Steel 304 Electropolished Seamless Tubes
As a Stainless Steel 304 Electropolished Seamless Tubes Manufacturer, we offer a range of tube grades, surface finishes, and sizes to suit different industrial and clean-process applications.
- 304 Electropolished Seamless Tubes (S30400): Suitable for food processing, dairy, beverage, and general clean-service applications.
- 304L Electropolished Seamless Tubes (S30403): A low-carbon option for applications involving on-site welding.
- 304H Electropolished Seamless Tubes (S30409): Designed for applications requiring higher strength at elevated temperatures.
- ID and OD Electropolished Tubes: Both internal and external surfaces are polished for improved surface cleanliness.
- ID Electropolished Tubes: Internally polished for product-contact applications, with a bright-annealed outer surface.
- OD Electropolished Tubes: Externally polished for visible installations and applications requiring an enhanced appearance.
- Small-Bore Instrumentation Tubes: Available in 6.35–12.7 mm outside diameters for sampling, gas, and control lines.
- Process Tubes: Available in 19.05–76.2 mm outside diameters for product transfer, water, and CIP systems.
- Bright-Annealed Base Tubes: Cold-drawn and bright-annealed tubes used as base material for electropolishing.
- Capped and Sleeved Tubes: Supplied with protective end caps and sleeves to help prevent surface damage during handling and transportation.
We supply these tube types in various grades, dimensions, wall thicknesses, and finishes according to project specifications.
304, 304L and 304H Stainless Steel Electropolished Seamless Tubes Manufacturers and Suppliers in India
We manufacture and supply electropolished seamless tubes in SS 304, 304L, and 304H grades for applications requiring corrosion resistance, smooth surfaces, and reliable performance.
- SS 304 (UNS S30400, 1.4301): A versatile grade containing 18% chromium and 8% nickel, commonly used in food processing, dairy, beverage, and clean-water systems.
- SS 304L (UNS S30403, 1.4307): A low-carbon grade suitable for welded systems, with improved resistance to sensitisation. Dual-certified 304/304L options are available.
- SS 304H (UNS S30409, 1.4948): A higher-carbon grade designed for applications requiring greater strength at elevated temperatures.
- Electropolished Finishes: Choose internal and external (ID/OD) polishing or internal-only (ID) polishing according to your application.
- Surface Roughness: Ra values of 0.5 µm, 0.38 µm, and 0.25 µm maximum are available as per specifications.
Our tubes come in different outside diameters, wall thicknesses, and lengths to suit project requirements. We support customised orders with material grades and surface finishes selected to meet the required specifications.
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Stainless Steel 304 Electropolished Seamless Tubes Specification
| Item | Detail |
|---|---|
| Product | Stainless Steel 304 Electropolished Seamless Tubes |
| Grades | 304 (S30400), 304L (S30403), 304H (S30409) |
| Process | Seamless, cold drawn, solution annealed, then electropolished |
| Tube standards | ASTM A269 / ASME SA269, ASTM A213 / ASME SA213, 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, with 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 304 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 |
| EN 10216-5 | Seamless stainless steel tubes for pressure purposes | European grades 1.4301, 1.4307, 1.4948 |
| ASTM A1016 | General requirements for ferritic alloy steel, ferritic stainless steel and austenitic 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 and test methods |
| ASTM A380 | Cleaning, descaling and passivation of stainless steel parts | Cleanliness and ferroxyl test |
| ASME BPE | Bioprocessing equipment | Pharmaceutical and biotech tube surface finish |
| 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 304 Electropolished Seamless Tubes Material and Grades
Pick the grade by the welding method, temperature and cleanliness requirement. The table lists the 304 grades with their UNS and EN numbers.
| Grade | UNS | EN number | EN name | Typical use |
|---|---|---|---|---|
| 304 | S30400 | 1.4301 | X5CrNi18-10 | Food, dairy, beverage, clean water |
| 304L | S30403 | 1.4307 | X2CrNi18-9 | Welded process lines, pharmaceutical utilities |
| 304H | S30409 | 1.4948 | X6CrNi18-11 | Warm process lines needing higher strength |
What Is the Difference Between Stainless Steel 304 Electropolished Seamless Tubes and Stainless Steel 316L Electropolished Seamless Tubes?
The short answer: 316L adds molybdenum, which gives it better resistance to chlorides and pitting, while 304 costs less and suits clean service without strong chloride. Use 304 for food, dairy, beverage and clean water, and 316L for pharmaceutical, biotech and chloride-bearing lines.
| Point | SS 304 Electropolished Seamless Tubes | SS 316L Electropolished Seamless Tubes |
|---|---|---|
| Chromium | 18.0–20.0% | 16.0–18.0% |
| Nickel | 8.0–11.0% (304), 8.0–13.0% (304L) | 10.0–14.0% |
| Molybdenum | None | 2.0–3.0% |
| Chloride and pitting resistance | Good | Better |
| Corrosion in mild acids | Good | Better |
| Tensile strength, min | 515 MPa (304), 485 MPa (304L) | 485 MPa |
| Cost | Lower | Higher |
| Common standards | ASTM A269, A213 | ASTM A269, A213, ASME BPE |
| Typical use | Food, dairy, beverage, general clean lines | Pharmaceutical, biotech, chloride service |
Stainless Steel 304 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.
| Element | 304 (S30400) | 304L (S30403) | 304H (S30409) |
|---|---|---|---|
| Carbon (C) | 0.08 | 0.035 | 0.04–0.10 |
| 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 | 1.00 |
| Chromium (Cr) | 18.0–20.0 | 18.0–20.0 | 18.0–20.0 |
| Nickel (Ni) | 8.0–11.0 | 8.0–13.0 | 8.0–11.0 |
Stainless Steel 304 Electropolished Seamless Tubes Mechanical Properties
Mechanical properties come from the base 304 tube, and electropolishing does not change them. The table gives minimum values and typical physical data, one property per row.
| Property | 304 | 304L | 304H |
|---|---|---|---|
| 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) | 7.93 | 7.93 | 7.93 |
| Thermal conductivity at 100 °C (W/m·K) | 16.2 | 16.2 | 16.2 |
| Modulus of elasticity (GPa) | 193 | 193 | 193 |
Stainless Steel 304 Electropolished Seamless Tubes Size and Weight Chart
Weight depends on OD and wall thickness. 304 stainless steel has a density of about 7.93 g/cm³, so we use this formula:
OD and wall are in mm. Example: 1 in OD, 16 BWG (1.65 mm) is (25.40 − 1.65) × 1.65 × 0.02491 = 0.976 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) | 20 BWG, 0.89 mm (kg/m) | 18 BWG, 1.24 mm (kg/m) | 16 BWG, 1.65 mm (kg/m) | 14 BWG, 2.11 mm (kg/m) |
|---|---|---|---|---|---|
| 1/4" | 6.35 | 0.121 | 0.158 | 0.193 | — |
| 3/8" | 9.53 | 0.192 | 0.256 | 0.324 | 0.390 |
| 1/2" | 12.70 | 0.262 | 0.354 | 0.454 | 0.557 |
| 3/4" | 19.05 | 0.403 | 0.550 | 0.715 | 0.890 |
| 1" | 25.40 | 0.543 | 0.746 | 0.976 | 1.224 |
| 1-1/2" | 38.10 | 0.825 | 1.139 | 1.498 | 1.892 |
| 2" | 50.80 | 1.107 | 1.531 | 2.020 | 2.559 |
Available Sizes, Dimensions and Tolerances
Stainless Steel 304 Electropolished Seamless Tubes are ordered by OD and wall thickness, with the wall given in BWG gauge or in mm. Small-bore 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.
| OD (in) | OD (mm) | Walls commonly ordered (mm) |
|---|---|---|
| 1/4" | 6.35 | 0.89, 1.24, 1.65 |
| 3/8" | 9.53 | 0.89, 1.24, 1.65 |
| 1/2" | 12.70 | 1.24, 1.65, 2.11 |
| 3/4" | 19.05 | 1.65, 2.11 |
| 1" | 25.40 | 1.65, 2.11 |
| 1-1/2" | 38.10 | 1.65, 2.11 |
| 2" | 50.80 | 1.65, 2.11 |
| 2-1/2" | 63.50 | 1.65, 2.11 |
| 3" | 76.20 | 1.65, 2.11 |
Tolerances on OD, wall and length follow ASTM A269 or A213 together with ASTM A1016. Tell us if your drawing calls for closer limits. Electropolishing removes a thin surface layer, so quote the final dimensions you need.
Common Materials in Stainless Steel 304 Electropolished Seamless Tubes
We manufacture and supply Stainless Steel 304 Electropolished Seamless Tubes in commonly specified grades to suit different welding requirements, operating temperatures, and cleanliness standards.
304 (S30400, 1.4301): The standard 304 stainless steel grade, containing approximately 18% chromium and 8% nickel. It is widely used in food processing, dairy, and beverage applications.
304L (S30403, 1.4307): A low-carbon grade suitable for welded piping systems, offering improved resistance to weld decay.
304H (S30409, 1.4948): A higher-carbon grade designed for applications requiring greater strength at elevated temperatures.
Dual-Certified 304/304L: Combines the requirements of both grades in one tube, making it a common choice for clean process lines.
As Stainless Steel 304 Electropolished Seamless Tubes Suppliers, we offer these grades in various diameters, wall thicknesses, lengths, and electropolished finishes to meet specific project requirements.
Stainless Steel 304 Electropolished Seamless Tubes We Manufacture and Supply
We make Stainless Steel 304 Electropolished Seamless Tubes for the jobs below. The finish and wall follow the product and the cleaning method.
| Line | Typical grade | Typical finish |
|---|---|---|
| Dairy and beverage product lines | 304, 304L | ID and OD electropolished |
| Brewery and CIP return lines | 304, 304L | ID electropolished |
| Purified water and clean utility lines | 304L | ID and OD electropolished |
| Pharmaceutical utilities | 304L | ID and OD electropolished |
| Instrumentation and sampling lines | 304, 304L | ID electropolished, small bore |
| Visible and architectural runs | 304 | OD electropolished |
Applications of Stainless Steel 304 Electropolished Seamless Tubes
- Pharmaceutical industry: Purified water, utility and process lines.
- Biotech plants: Buffer, media and clean-in-place lines.
- Food processing: Product transfer and ingredient lines.
- Dairy plants: Milk, cream and CIP lines.
- Beverage and brewing: Wort, beer, juice and soft-drink lines.
- Cosmetics and personal care: Product transfer and mixing lines.
- Clean water systems: Treated water and high-purity water distribution.
- Laboratory equipment: Sample lines and analytical instrument tubing.
- Instrumentation: Control, sampling and gas lines.
- Architecture and interiors: Handrails and fittings that need a bright, easy-clean finish.
Why Choose Us as Your Stainless Steel 304 Electropolished Seamless Tubes Manufacturer in India?
Sachiya Steel International has been serving the pipes and tubes industry since 2005, manufacturing and supplying Stainless Steel 304 Electropolished Seamless Tubes for domestic and international markets. With a supply capacity of up to 100 metric tons per month and exports to 85+ countries, we cater to bulk orders and customised project requirements. We offer various outside diameters, wall thicknesses, lengths, and electropolished finishes, with ready-stock sizes available subject to availability.
As a trusted Stainless Steel 304 Electropolished Seamless Tubes Supplier in India, we focus on product quality, material traceability, dimensional accuracy, and timely delivery. Our certifications and approvals include ISO 9001:2015, ISO 14001:2015, ISO 45001:2018, PED 2014/68/EU, and TÜV approvals. We provide EN 10204 3.1 material test certificates with every order, while 3.2 certification and third-party inspection can be arranged on request. Our export team also supports international documentation, export packaging, and shipping, with protective end caps and sleeves to help preserve the electropolished surface during transit.
Countries We Export Stainless Steel 304 Electropolished Seamless Tubes To
We supply Stainless Steel 304 Electropolished Seamless Tubes from India to 85+ countries worldwide, serving customers across multiple industries with export support and products tailored to their specifications.
Middle East: UAE, Saudi Arabia, Qatar, Oman, Kuwait, and Bahrain.
Europe: Germany, Italy, United Kingdom, Netherlands, France, Spain, and Belgium.
Asia-Pacific: Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, and Australia.
Americas: USA, Canada, Mexico, and Brazil.
Africa: South Africa, Nigeria, Egypt, and Kenya.
For international orders, we provide EN 10204 3.1 material test certificates, with 3.2 certification and third-party inspection available on request. Export packaging and shipping documentation are arranged according to destination and order requirements.
Stainless Steel 304 Electropolished Seamless Tubes FAQs
Common questions about 304 grade selection, electropolishing, surface roughness, dimensions, and testing.
Should I choose 304, 304L or 316L for electropolished tubes?
Choose 304L for welded clean process lines, because its low carbon avoids weld decay. Choose 304 for food, dairy and beverage lines that are not welded on site, and 316L for pharmaceutical, biotech or chloride-bearing service.
How does electropolishing differ from mechanical polishing?
Electropolishing dissolves a thin layer of metal and levels the surface, while mechanical polishing drags metal across the surface and can leave scratches and embedded grit. The electropolished surface is smoother, cleaner and easier to sanitise.
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. OD-only polish suits visible and architectural use.
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.
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 × 0.02491, 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.