Forms and finishes

Stainless Steel Electropolished Pipe & Tube

Request a quote for electropolished tubing. Specify grade, OD, wall, required surface roughness and whether ID or OD finish is needed.

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Technical reference

Specifications and ordering data

Specification

Field	Order reference
Standard	Base tubing standard plus specified electropolish process and finish criteria
Product or route	Round tube with internal, external or two-sided treatment
Critical dimensions and fit	Put maximum Ra, measurement location and seam treatment on the RFQ
Supply enquiry	Confirm sizes, lengths, route, documentation and lead time for your order

Dimensions and weight

Illustrative drawing sizes. The bore and mass are calculated from the nominal dimensions. Use the project tolerance and confirm the size and route in the quote.

Tube OD (mm)	Wall (mm)	Nominal bore (mm)	Estimated kg/m at 8,000 kg/m³
12.7	1.24	10.22	0.36
25.4	1.65	22.10	0.98
38.1	1.65	34.80	1.51

Service and pressure basis

Use the approved design code and service conditions. The applicable rating depends on material, temperature, minimum effective wall, joint details and the limits of the connected assembly. A schedule or a hydrostatic test result alone cannot establish an operating pressure.

Reference ASME process piping code B31.3

Chemical composition

The grade on the purchase line controls chemistry. Specify the grade with the finished product standard or drawing.

Check	What to match
Grade and specification	TP or UNS on the quotation and material report
Heat analysis	Full limits and any stabilising or alloy additions under the ordered edition

Reference ASTM steel standards

Mechanical properties

Use the ordered grade, delivery condition and product standard to review the actual tensile, yield, elongation or hardness results required by the order.

Check	What to verify
Condition	Heat treatment or cold-work condition stated for the offered form
Acceptance	Project-specified dimensions and relevant test records

Reference ASTM steel standards

Testing and certificates

Request the finish report, agreed cleanliness checks and packing details.

When	What to check
Before ordering	Document the required test method, edition and any witness points
At delivery	Match the material report and heat or lot identification to the shipment

Application and product comparison

A270 addresses sanitary tube, while the order must still state the finish.

For the enquiry, put maximum Ra, measurement location and seam treatment on the RFQ.

Example request for quotation

Base tubing standard plus specified electropolish process and finish criteria · 12.7 × 1.24 mm. Add quantity, lengths, delivery city and the required reports.

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Ordering guidance

State the surface that needs electropolishing

Specify whether the requirement applies to the inside, outside or both. If a roughness limit is required, give the value, units, measurement basis and any documentation your quality team requires.

Also provide grade, product specification, OD, wall, length and any packaging or cleanliness requirements. Do not infer hygienic certification from the finish description alone.

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Illustration: Small-bore stainless tubes and a continuous coil

Buyer’s guide

Electropolished stainless tubing ordered by surface and acceptance

Identify the surface to be electropolished

Specify whether the requirement applies to the bore, the outside or both. A shiny outside surface cannot establish the condition of the bore. Give the material grade, product standard, actual OD and wall, then state whether the longitudinal seam needs separate blending or examination.

Put roughness and inspection on the line item

Write the maximum specified Ra value, its units and the surface where it applies. Include the agreed measurement or reporting method and any sampling points stated in the project documents. Electropolishing describes a process, while the finish criteria define what the buyer can accept. If a separate passivation or cleanliness verification is required, identify the test and record.

Plan cleanliness from packing to installation

State whether the tube must be cleaned, capped and individually bagged. Give requirements for protected ends and handling after cutting. If the project requires a particular hygienic tubing standard, add it as a separate field from electropolishing.

Example enquiry

A hygienic line can specify TP316L, actual tube OD and wall, internal electropolish with the maximum Ra per drawing, a finish report, clean capped ends and tagged lengths. The offer should show each of those requirements.

Are chemical passivation and electropolishing the same purchase instruction?

They describe different processes. Write the required process and acceptance criteria, then identify any testing the project requires.

Technical references ASTM B912 electropolishing scope · ASTM steel standards directory

Prepare your enquiry

What to put on the purchase list

Item	What to send
Product details	Grade and standard · OD × wall · ID/OD finish · roughness and measurement · packing
Delivery	Quantity with units, delivery city and required date if known
Acceptance	Required certificates and inspection scope; attach the drawing revision where applicable

Does electropolished automatically mean an agreed roughness?

No. Put the surface and roughness acceptance criteria on the RFQ and ask the supplier to confirm them.

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Project enquiries

Request pricing and availability

Send your dimensions, quantities and delivery city. Include any inspection or material certificate requirements so they can be quoted against the same line items.

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