Sanitary Stainless Steel Pipe and Tubing for Food, Beverage and Pharmaceutical Industries
In food, beverage and pharmaceutical production, the pipe surface touches the product. Materials must be corrosion resistant, smooth, easy to clean and non-contaminating. Sanitary stainless steel tubing in grades 304 and 316L is the global standard for these industries. This guide explains the grades, surface finishes and standards buyers should specify.
What Hygienic Piping Must Deliver
- Corrosion resistance against product, cleaning chemicals and steam
- Smooth internal surface so bacteria and residues cannot hide
- Cleanability through CIP (clean-in-place) and SIP (steam-in-place) cycles
- No leaching or contamination of the product
- Traceability of material and processing records, especially in pharma
Common Grades
304 / 304L
Widely used in dairy, brewing, beverage and general food processing, where the product and cleaning agents are not high in chlorides.
316L
The preferred choice for pharmaceutical, biotech and more aggressive food applications. Its molybdenum content improves resistance to chlorides and cleaning chemicals, and its low carbon content helps preserve corrosion resistance after welding.
Higher Alloys and Duplex
For very high-chloride products (sauces, brines) or aggressive cleaning regimes, super austenitic or duplex grades may be used.
Surface Finish: Why It Matters
The internal surface roughness (Ra) directly affects cleanability. Typical options include:
| Finish | Typical use |
|---|---|
| Mill finish / pickled | General industrial and utility lines |
| Mechanically polished (e.g., Ra ≤ 0.8 µm) | Food and beverage product lines |
| Mechanically polished + electropolished (e.g., Ra ≤ 0.5 µm or lower) | Pharmaceutical, biotech, WFI, high-purity lines |
Electropolishing removes a thin surface layer, leaving a smooth, bright, passive finish that reduces microscopic peaks where bacteria and deposits can collect. Pharmaceutical and biotech projects often specify electropolished tubing together with passivation.
Standards to Specify
- ASTM A270: seamless and welded austenitic stainless steel sanitary tubing
- ASTM A269 / A249: general seamless and welded tubing
- ASME BPE: bioprocessing equipment standard covering dimensions, tolerances, surface finish and documentation
- 3-A Sanitary Standards and DIN 11850 / EN 10357 in dairy and European food markets
- ASTM A967 / A380: passivation and cleaning procedures
Practical Buying Tips
- State the grade (304/304L or 316/316L), tube standard and OD × wall thickness (inch or metric series)
- Define the internal and external finish (Ra value, polishing grit, electropolish, passivation)
- Ask for orbital welding-friendly tolerances if the system will be orbitally welded on site
- Require cleaning, capping and packaging suitable for hygienic use (ends capped, tubes bagged)
- Request full documentation: mill certificates, roughness reports and lot traceability
- Email: info@duplex-stainless-steel.com
- WhatsApp / WeChat: +86-13587686960
- Send Your Inquiry →
Frequently Asked Questions
Q1: What is the difference between 304 and 316L for food and pharma?
316L contains molybdenum and less carbon, giving better resistance to chlorides and cleaning chemicals and better weld corrosion resistance. It is the standard for pharmaceutical use, while 304 is common in general food and beverage processing.
Q2: Is electropolishing necessary?
Not always. Food and beverage lines are often mechanically polished. Pharmaceutical and biotech systems handling high-purity water or sterile products commonly require electropolishing and passivation.
Q3: What is ASME BPE?
ASME BPE is a standard for bioprocessing equipment that sets requirements for design, dimensions, materials, surface finish, and inspection for tube, fittings and systems used in biopharmaceutical manufacturing.
Q4: Can you supply polished tubing with cleaning and packaging for hygienic use?
Yes. Please state the finish, Ra requirement and packaging needs in your inquiry.
Request a Quote for Sanitary Stainless Steel Tubing
Send us your grade, standard, OD × wall thickness × length, surface finish, quantity and destination, and we will reply with pricing and lead time within 24 hours.