What is a BA finish and why does it matter?

Bright annealing is carried out under a protective hydrogen atmosphere, so the tube comes out of the furnace fully annealed with a clean, oxide-free, mirror-like surface. Because there is no scale to pickle off, the surface roughness stays low, which is what hygienic and high purity systems need for cleanability and passivation.

Which grades and sizes do you supply?

304L and 316L as standard from 3 mm to 76.2 mm OD in straight lengths and coils, plus nickel alloys 800, 800HT, 825 and 625 where temperature or corrosion rules out stainless.

Can you supply electropolished tube?

Yes — electropolished to Ra 0.25 µm or better, capped and double bagged, with the surface roughness measurement included in the documentation package for semiconductor and bio-pharma work.

Is the tube suitable for instrument and impulse lines?

Yes. The close OD, wall and ovality control is what compression and ferrule fittings need for a repeatable seal, and the tube is supplied in 6, 8, 10 and 12 mm as well as 1/4" to 1/2" imperial sizes.

BA Finish Tubes

Name: BA Finish Tubes
SKU: ba-finish-tubes
Availability: InStock

Bright annealed tubing for clean and instrument service

Stock statusMill indent

Typical lead timeCommon sizes 2 - 3 weeks; electropolished 5 - 7 weeks

Bright annealed (BA) tube — annealed under a protective hydrogen atmosphere so it leaves the furnace with a mirror-clean, oxide-free surface that needs no pickling. The low surface roughness is what hygienic, instrument and high-purity systems are after: less product hold-up, easier passivation and a surface that cleans in place.

Oxide-free bright annealed surface straight from the mill — no pickling marks
Low Ra for cleanability, passivation and minimal product hold-up
Close dimensional control for compression and ferrule fittings
Capped and sleeved packing so the finish reaches the installation intact

Types & configurations

Type	Specification
Stainless BA tubes	ASTM A269 / A270 in 304L and 316L, 3 - 76.2 mm OD, Ra 0.4 µm or better
Hygienic & sanitary tubes	ASTM A270 / DIN 11850 / ISO 1127 for food, dairy, brewing and pharmaceutical process lines
Instrument & impulse tubing	ASTM A269 seamless 6 / 8 / 10 / 12 mm and 1/4" - 1/2" coils and straight lengths
High purity & UHP tubing	Electropolished to Ra 0.25 µm, capped and double bagged for semiconductor and bio-pharma
Nickel alloy BA tubes	Alloy 800, 800HT, 825 and 625 bright annealed for clean high temperature and corrosive service
Heat exchanger BA tubes	Bright annealed exchanger tube where the tube side must stay deposit-free

Specifications

Property	Value
Surface finish	BA as standard (Ra 0.4 µm or better); mechanically polished and electropolished options
Size range	3 mm to 76.2 mm OD, 0.5 mm to 4 mm wall, straight lengths and coils
Tolerances	Close OD, wall and ovality control for ferrule and compression fittings
Testing	Hydrostatic or eddy current, hardness, flare and bend, surface roughness measurement
Packing	End caps and individual PE sleeving so the finish survives site handling

Typical applications

Pharmaceutical and biotech process lines

Food, dairy and beverage plant

Instrument and impulse tubing on skids and platforms

Semiconductor and high purity gas systems

Clean steam and WFI distribution

Analyser and sampling systems

Frequently asked

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$Refractory Materials$

Refractory Materials

Linings for kilns, furnaces and high-temperature plant

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Shell and tube bundles supplied to the TEMA sheet

Boiler Tubes

Water wall, superheater and reheater tubing

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Extended surface tubing for air-cooled and recovery duty

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