Top-Quality Bright Annealed Pipe Supplier in China

Q: Can BA pipe be welded?

Да. However,because the inner walls are extremely clean,it is generally recommended to use TIG orbital welding with high-purity argon as a shielding gas to prevent oxidation at the weld site.

What is A Bright Annealed Pipe

A bright annealed pipe,commonly referred to as a BA tube,is a type of труба из нержавеющей стали produced through a specialized heat treatment process.Compared to standard annealed and pickled (AP) pipes,BA pipes feature a mirror-like finish,exceptionally clean inner and outer surfaces,and superior corrosion resistance.

In practical applications,standard 304 pipes offer excellent value for money and are sufficient for general food processing and decorative needs;meanwhile,316L pipes,due to the addition of molybdenum,far outperform 304 pipes in resistance to chloride pitting corrosion,making them the preferred choice for high-purity transport in the pharmaceutical and semiconductor industries.For extreme environments involving strong acids or high pressure,2205 duplex steel pipes stand out due to their strength—twice that of the 300 series—and exceptional resistance to stress corrosion cracking.

Common Grades of Bright Annealed Pipe

Common Grades and Their Chemical Composition

Based on the ASTM A240/A269 standards,the most commonly used materials in the bright annealed (BA) process include austenitic and duplex stainless steels.The following is a list of common grades and their standard chemical compositions.

Оценка	C	Mn	Cr	Ni	Пн	Note
304	0.08	2.00	18,0 – 20,0	8.0 – 11.0	–	Versatile and economical
304L	0.03	2.00	18,0 – 20,0	8,0 – 12,0	–	Low-carbon, easy to weld
316	0.08	2.00	16,0 – 18,0	10,0 – 14,0	2,0 – 3,0	Pitting-resistant
316L	0.03	2.00	16,0 – 18,0	10,0 – 14,0	2,0 – 3,0	316 Low-Carbon Version
321	0.08	2.00	17.0 – 19.0	9.0 – 12.0	–	Contains Ti (5xC~0.7)
2205	0.03	2.00	22.0 – 23.0	4.5 - 6.5	3.0 – 3.5	High strength,stress crack resistance

The Role of Key Elements

Chromium is the key element in the formation of the passivation film on the surface of stainless steel and directly determines its corrosion resistance.
Nickel stabilizes the austenitic structure,improving the material’s ductility and stability in acidic environments.
Molybdenum significantly enhances resistance to chloride pitting corrosion,which is the key distinction between the 316 series and 304.
Titanium acts as a stabilizer in 321,preventing intergranular corrosion in high-temperature environments.

Common Grades and Their Mechanical Properties

In accordance with ASTM A269/A213 standards,bright annealed tubes provide a mirror-like finish while eliminating work hardening through the annealing process,thereby restoring the material’s ductility.

Оценка	Предел прочности	Предел текучести	Удлинение	Твердость
304	≥ 515 МПа (75 ksi)	≥ 205 МПа (30 ksi)	≥ 35%	≤ 90 HRB
304L	≥ 485 МПа (70 ksi)	≥ 170 МПа (25 ksi)	≥ 35%	≤ 90 HRB
316	≥ 515 МПа (75 ksi)	≥ 205 МПа (30 ksi)	≥ 35%	≤ 90 HRB
316L	≥ 485 МПа (70 ksi)	≥ 170 МПа (25 ksi)	≥ 35%	≤ 90 HRB
321	≥ 515 МПа (75 ksi)	≥ 205 МПа (30 ksi)	≥ 35%	≤ 90 HRB
2205	≥ 655 MPa (95 ksi)	≥ 450 MPa (65 ksi)	≥ 25%	≤ 31 HRC

Key Takeaways for Selection

Формуемость:
Grades like 304L and 316L have lower yield strength and high elongation,making them exceptionally easy to bend or coil without cracking.This is critical for instrumentation tubing.
High-Pressure Performance:
Duplex 2205 stands out with nearly double the yield strength of the 300-series.It is the preferred choice for high-pressure hydraulic systems or offshore control lines where weight and wall thickness need to be minimized.
Hardness Control:
We strictly control the hardness of BA pipes to be below 90 HRB.This ensures that when used with compression fittings,the tube is softer than the ferrule,guaranteeing a leak-proof metal-to-metal seal.

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4 Main Steps for Manufacturing A Bright Annealed Pipe

Холодная обработка

High-quality parent tubes are selected and subjected to cold rolling or cold drawing.Cold working reduces the outer diameter and wall thickness,resulting in precise dimensional tolerances and a smooth initial surface.This mechanical process also hardens the steel,preparing it for subsequent refining stages.

Degreasing and Ultrasonic Cleaning

Before heat treatment,the tubes must be thoroughly cleaned.Any lubricants,oils,or greases left over from the cold working stage must be removed using ultrasonic cleaning or chemical degreasing.If contaminants remain,they will burn during the annealing process,causing carbon deposits or “black spots” to form,which will ruin the mirror finish.

Светлый отжиг

The pipe stock is placed in a controlled furnace and heated to the recrystallization temperature.The key lies in the protective atmosphere,which typically consists of high-purity hydrogen or a hydrogen-nitrogen mixture.By excluding oxygen,the steel does not oxidize,thereby retaining its metallic luster and restoring its ductility.

Precision Straightening and Finishing

After exiting the furnace’s cooling section,the pipe undergoes precision straightening to ensure it meets strict straightness requirements.Finally,the pipe is cut to the required length, and both ends are deburred or chamfered;each section is then inspected for surface roughness and mechanical integrity.

Applications of Bright Annealed Pipe

FAQs About Bright Annealed Pipe

Can BA pipe be welded?

Да.However,because the inner walls are extremely clean,it is generally recommended to use TIG orbital welding with high-purity argon as a shielding gas to prevent oxidation at the weld site.

How does Kaysuns store and handle BA pipes?

Because the surface of BA tubes is delicate,we individually wrap each tube in plastic and seal both ends to prevent dust and moisture from entering the tube.We specifically instruct international couriers to store them in a dry,clean environment and avoid direct contact with carbon steel to prevent electrochemical corrosion.

Which is better for BA tubing, 304L or 316L?

If the environment requires only high cleanliness,304L is sufficient.If corrosive media are involved,316L is the better choice.

What makes Kaysuns' stainless steel BA tubes special?

Our stainless steel BA tubes feature exceptional surface finish,strict “oil-free” cleaning standards,superior dimensional accuracy,and comprehensive protection and delivery.

The inner surface roughness of the tubes is consistently controlled at Ra ≤ 0.4 μm.Prior to annealing,the tubes undergo ultrasonic circulation cleaning to thoroughly remove any residues.Tolerance control for the tubes far exceeds the requirements of ASTM A269 or EN 10216-5 standards.Every BA tube undergoes 100% pressure testing,nitrogen purging,and capping before shipment,and is individually bagged.

What types of BA pipes do you offer? Do you offer any other products?

Kaysuns offers BA pipes in grades including,but not limited to,the 304/L, 316/L, 321, and 2205 mentioned above.If you require BA pipes in other materials,please feel free to связаться с нами at any time.Our product range includes:

Seamless Pipes: 1/2” – 24” / 6 mm to 610 mm
Welded Pipes: 6” – 104” / 159 mm to 2800 mm

In addition to steel pipes, we also supply plates,forgings,flanges,ingots,and various fasteners (bolts,nuts,flat washers,spring washers).Customized non-standard products are available.Some products can be supplied in small batches.

Bright Annealed Pipe Supplier in China

What is A Bright Annealed Pipe

Common Grades of Bright Annealed Pipe