Stainless Steel Electropolished Pipe

SS 304, 316L EP Tubing | Manufacturer, Supplier & Exporter in India

Electropolished Pipe

Stainless Steel Electropolished Pipe & EP Tubing – Manufacturer in India

Stainless Steel Electropolished Pipe is a precision-finished piping product used extensively in pharmaceutical, biotechnology, semiconductor, food processing, dairy, and chemical industries. Our EP Tubing undergoes an advanced electrochemical process that removes microscopic surface imperfections, delivering an ultra-smooth, bright, and contamination-resistant finish. As a leading SS Electropolished Pipe manufacturer and exporter in India, we supply SS 304 Electropolished Pipe, SS 316L Electropolished Tube, High Purity EP Tubing, and the complete range of electro polished stainless steel products to global clients at competitive prices.

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What is Stainless Steel Electropolished Pipe?

Electropolished Stainless Steel Pipe — also known as ‘reverse plating’ — is produced through an electrolytic process using a combination of phosphoric and sulfuric acids along with electrical current. This removes a controlled layer of metal atom by atom, eliminating micro-burrs, pits, surface irregularities, and embedded particles. The result is a pipe that is:

Microscopically smooth with Ra values as low as 0.25 µm
Highly corrosion resistant due to an enhanced chromium oxide passive layer
Easy to clean and sterilize — fully CIP/SIP compatible
Compliant with ASME BPE, FDA, GMP, and cGMP standards
Ideal for Ultra-High Purity (UHP) and High Purity (HP) piping systems

Stainless Steel Electropolished Pipe Size Chart

Electropolished Seamless Stainless Steel Pipe:

Size Range: 6NB to 1200NB
OD Range: 1/8″ to 12″ NPS (3.18 mm to 323.85 mm)
Wall Thickness: 0.6 mm to 12.7 mm
Length: Single Random, Double Random & Cut-to-Length
Schedules: SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 160, SCH XXS

Electropolished ERW / Welded Stainless Steel Pipe:

Size Range: 1/8″ to 36″ NB | 1/4″ to 36″ OD
OD Range: 6.35 mm to 914.4 mm
Wall Thickness: 0.8 mm to 12.7 mm
Length: Up to 26 Meters

Electropolished Stainless Steel Instrumentation/Sanitary Tubing:

OD: 3 mm to 50.8 mm
Wall Thickness: 0.5 mm to 3 mm
Surface Finish (Ra): 0.25 µm, 0.38 µm, 0.5 µm, 0.8 µm ID/OD

Electropolished Stainless Steel Pipe – Specification Table

Parameter	Details
Standard Specifications	ASTM A312, ASTM A269, ASTM A270, ASTM A249, ASTM A554
ANSI/ASME Standards	ANSI/ASME B36.19M, B36.10M, ASME BPE
Available Shapes	Round, Square, Rectangle, Hex, Oval, Hydraulic, Honed
Manufacturing Types	Seamless, Welded (ERW/EFW), 100% X-Ray Welded, CDW, Fabricated
Grades Available	304, 304L, 304H, 316, 316L, 316Ti, 321, 321H, 317L, 310S, 347, 904L
Surface Finish	2B, No.4 Brushed, No.8 Mirror, BA Finish, Electropolished (EP), Inner Polished
Ra Surface Roughness	0.25 µm, 0.38 µm, 0.5 µm, 0.8 µm (ID/OD as required)
End Types	Plain (PE), Beveled (BE), Threaded, Grooved, Bevel One End, Plain Both Ends
Delivery Conditions	Annealed & Pickled, Bright Annealed, Cold Drawn, Polished
Pipe Schedules	SCH 5, SCH 10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS
Test Certificates	Mill Test Certificate (MTC/MTR), EN 10204 3.1 / 3.2
Testing	Hydrostatic, Ultrasonic, Radiographic, PMI, IGC, Hardness, Surface Roughness
Value-Added Services	Cutting, Beveling, Threading, Grooving, Polishing, Color Coding, Export Packaging, Non-Destructive Testing, Machining

Grades & Types of Electropolished Stainless Steel Pipe

SS 304 Electropolished Pipe

The most widely used and cost-effective EP grade. Suitable for food processing, dairy equipment, pharmaceutical manufacturing, and general sanitary applications with excellent oxidation resistance.

SS 304L Electropolished Pipe

Low carbon variant minimizing carbide precipitation during welding. Ideal for biotech and food-grade piping systems requiring EP finish and weld integrity.

SS 316 Electropolished Pipe

Contains molybdenum for superior pitting and crevice corrosion resistance. Preferred for marine, chemical, and industrial pharmaceutical environments.

SS 316L Electropolished Pipe / Tube

Highly specified for high purity EP tubing in pharma and semiconductor industries. Meets ASME BPE standards and compatible with CIP/SIP cleaning.

SS 316Ti Electropolished Pipe

Titanium-stabilized 316 variant for high-temperature applications such as chemical plants, exhaust systems, and heat exchangers.

SS 321 Electropolished Pipe

Stabilized austenitic grade for high-temperature service. Used in aerospace, furnace internals, and exhaust systems requiring EP finish.

SS 317L Electropolished Pipe

Higher molybdenum content than 316L for extreme corrosion resistance in sulfuric acid and aggressive chemical environments.

SS 904L Electropolished Pipe

Super austenitic grade for highly corrosive EP applications including desalination plants and chemical reactor piping systems.

SS 310S Electropolished Pipe

High chromium-nickel grade for high-temperature furnaces, heat treatment equipment, and kilns requiring oxidation resistance.

Surface Finish Options for Electropolished SS Pipe

Finish Type	Description	Ra Value
No. 4 Brushed Finish	Mechanical polishing with abrasive belt/brush	0.8 µm
BA (Bright Annealed)	Smooth reflective finish, heat-treated in controlled atmosphere	0.3–0.5 µm
Electropolished (EP)	Electrochemical surface material removal	0.25–0.5 µm
No. 8 Mirror Finish	Highly reflective, mechanically polished with fine abrasives	< 0.1 µm
Inner Polished Pipe	ID surface polished electro-chemically or mechanically	As required
2B Finish	Cold rolled, annealed, matte smooth finish	0.5 µm

Applications & Industries

Pharmaceutical & Biopharma

WFI (Water for Injection) systems, CIP/SIP lines, clean room piping, API manufacturing, and aseptic filling systems all require ASME BPE-compliant EP tubing. Our SS 316L EP pipes meet the most stringent pharmaceutical industry standards.

Semiconductor & Electronics

Ultra-high purity gas distribution systems, process gas piping, and vacuum lines where zero contamination is critical. Our electropolished pipes deliver consistent Ra values for the most demanding UHP applications.

Food & Dairy Industry

Hygienic milk transfer lines, beverage piping, CIP systems, and pasteurization equipment. ASTM A270 Electropolished Pipe is the standard for food-grade sanitary piping.

Biotechnology

Fermentation vessels, bioreactor piping, sterile fluid transfer lines, and buffer preparation systems requiring high-purity, contamination-free surfaces.

Chemical & Petrochemical

Acid-resistant EP pipes for chemical dosing systems, reactors, and storage — especially in SS 316L, 317L, and 904L grades that offer maximum resistance to aggressive chemicals.

Heat Exchangers & Condensers

ASTM A249 Electropolished Tube is used in shell-and-tube heat exchangers, condensers, and superheaters where surface cleanliness improves heat transfer efficiency.

ASTM Standards for Electropolished Stainless Steel Pipe

Standard	Application
ASTM A270	Seamless and welded austenitic stainless steel sanitary tubing — food and pharmaceutical EP piping
ASTM A269	Seamless and welded austenitic SS tubing for general service — acidic and corrosive conditions
ASTM A249	Welded austenitic steel boiler, superheater, heat exchanger, and condenser tubes
ASTM A312	Seamless, welded, and heavily cold worked austenitic stainless steel pipes
ASTM A554	Welded stainless steel mechanical tubing with EP finish
ASME BPE	Pharmaceutical and biopharmaceutical industry EP tubing — Ra values, dimensions, materials
ANSI/ASME B36.19M	Stainless steel pipe dimensions and schedules
ANSI/ASME B46.1	Surface texture and roughness measurement standard for EP pipes

Electropolishing Process – How It Works

The electropolishing process is a precise electrochemical metal removal technique carried out in the following steps:

Pre-Cleaning: The pipe is degreased and cleaned to remove oil, rust, and scale.
Rack Mounting: The pipe is mounted as the anode in an electrolytic cell.
Electrolytic Bath: A mixture of phosphoric acid (H3PO4) and sulfuric acid (H2SO4) serves as the electrolyte.
Current Application: Direct current is applied, causing metal ions to dissolve from the pipe surface.
Micro-Leveling: High points (peaks) on the surface dissolve faster than low points (valleys), resulting in a micro-smooth surface.
Rinsing & Passivation: The pipe is thoroughly rinsed and passivated to enhance the chromium oxide passive layer.
Quality Inspection: Surface roughness (Ra) is measured with a profilometer; visual and dimensional inspection is performed.

Advantages and Disadvantages of Electropolishing Technology

Advantages

Produces a mirror-bright finish that no mechanical process alone can achieve
Improves corrosion resistance by up to 30% over untreated stainless steel
Removes embedded iron, scale, weld discoloration, and surface contaminants
Reduces bacterial adhesion — critical for pharmaceutical and food-grade applications
Eliminates micro-burrs for safer handling and improved flow characteristics
Enhances dimensional accuracy — ideal for tight-tolerance systems
Extends service life and reduces maintenance frequency and downtime
Compatible with CIP (Clean-In-Place) and SIP (Sterilize-In-Place) systems

Disadvantages

Higher cost compared to mechanical polishing methods
Uses strong acids requiring careful handling and regulated disposal
Not suitable for all alloys — certain grades may be over-etched or uneven
Slight dimensional change due to metal removal (typically 10–20 µm per surface)
Requires skilled operators for consistent Ra value achievement and quality control

Electropolished Stainless Steel Pipe Price List

Grade	Approx. Price (USD/kg)
SS 304 Electropolished Pipe	USD 2.50 – 3.50 / kg
SS 304L Electropolished Pipe	USD 2.80 – 3.80 / kg
SS 316 Electropolished Pipe	USD 3.50 – 4.50 / kg
SS 316L Electropolished Pipe	USD 3.80 – 5.00 / kg
SS 321 Electropolished Pipe	USD 4.00 – 5.50 / kg
SS 317L Electropolished Pipe	USD 5.00 – 7.00 / kg
SS 904L Electropolished Pipe	USD 10.00 – 18.00 / kg
SS 310S Electropolished Pipe	USD 6.00 – 9.00 / kg

Grade	Approx. Price (USD/kg)
SS 304 Electropolished Pipe	USD 2.50 – 3.50 / kg
SS 304L Electropolished Pipe	USD 2.80 – 3.80 / kg
SS 316 Electropolished Pipe	USD 3.50 – 4.50 / kg
SS 316L Electropolished Pipe	USD 3.80 – 5.00 / kg
SS 321 Electropolished Pipe	USD 4.00 – 5.50 / kg
SS 317L Electropolished Pipe	USD 5.00 – 7.00 / kg
SS 904L Electropolished Pipe	USD 10.00 – 18.00 / kg
SS 310S Electropolished Pipe	USD 6.00 – 9.00 / kg

Why Choose Us as Your SS Electropolished Pipe Supplier?

ISO 9001:2015 Certified manufacturer with government-recognized export house status
Mill Test Certificates (EN 10204 3.1 / 3.2) provided with every shipment for full traceability
In-house testing: PMI, hydrostatic, ultrasonic, IGC, hardness, and surface roughness (Ra)
Wide stock of SS 304 and 316L EP pipes ready for immediate dispatch
Global exports to USA, UK, UAE, Germany, Saudi Arabia, Canada, Australia, Singapore, and 50+ countries
Custom sizes, finishes (ID/OD), and cut lengths as per buyer specifications
Competitive pricing with fast lead times and reliable logistics support
Dedicated technical team for project-specific material selection and documentation

Frequently Asked Questions (FAQs)

01.
What is the difference between electropolished pipe and bright annealed pipe?

Bright annealed (BA) pipe is heat-treated in a controlled atmosphere to give a reflective finish, but it does not remove surface metal. Electropolishing is an electrochemical process that physically removes metal to achieve lower Ra values and enhanced corrosion resistance beyond what BA can achieve.

02.
What Ra value can be achieved by electropolishing?

Depending on the base material finish, electropolishing can achieve Ra values of 0.25 µm (10 µin) or better, fully meeting ASME BPE requirements for pharmaceutical-grade EP tubing.

03.
Which grade is best for pharmaceutical EP piping?

SS 316L is the most commonly specified grade for pharmaceutical and biotech EP tubing due to its low carbon content, high purity, superior corrosion resistance, and ASME BPE compliance.

04.
Do you supply ASME BPE compliant EP tubing?

Yes, we supply ASME BPE compliant electropolished stainless steel tubing in all standard dimensions and Ra surface finish grades (SF1 to SF4).

05.
Can I order custom lengths and sizes?

Absolutely. We offer custom cutting, beveling, threading, grooving, and EP finishing as per your project specifications. Please share your drawing or datasheet for a tailored quotation.

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