In applications where contamination control, surface purity and dimensional accuracy are critical, Bright Annealed Tubes are the choice of professionals. We produce and export all types of Bright Annealed Stainless Steel Tubes that comply with — and often surpass — the standards set by the pharmaceutical, semiconductor, food processing, dairy and petroleum industries at Metinox Overseas. Owing to a mirror-like inner surface (Ra < 0.4 µm) and a surface oxide layer that has been removed, our BA tubes are treated in a controlled atmosphere in order to introduce hydrogen or nitrogen-hydrogen.
The Ra < 0.4 µm bore surface reduces microbial adhesion, supports CIP/SIP cycle validation, and satisfies FDA 21 CFR Part 11 and EHEDG surface hygiene requirements without secondary polishing Each tube produced at our facility comes with complete Mill Test Certificates (MTC EN 10204 3.1/3.2), and we have a full traceability system from raw material to dispatch. Metinox Overseas offers standard catalogue sizes or bespoke cut to length at competitive prices, quality and lead time – anywhere in the world.
Bright Annealing is a special heat-treatment process where stainless steel tubes are heated to a range of temperatures from 1,040°C to 1,200°C in a furnace under a protective atmosphere, usually a dry hydrogen or a mixture of nitrogen and hydrogen. The surface of the tube is free from discoloration and scale while the process is oxygen-free, which eliminates surface oxidation and allows the tube to be stress relieved and optimised for corrosion, while also being metallurgically superior.
Bright Annealing vs. Standard Annealing - What's the Difference?
Dry hydrogen (H2) or nitrogen-hydrogen (N2-H2) mix
Operating Temperature
900°C - 1,200°C (1,652°F - 2,192°F)
Heat Treatment Range (SS)
1,040°C - 1,150°C (1,904°F - 2,100°F)
Seamless Tube Temperature
1,550°F - 1,800°F (845°C - 980°C)
Dew Point Control
Maintained to eliminate moisture-induced oxidation
Mechanical & Chemical Properties
Mechanical Properties of BA Stainless Steel Tubes
Grade
Tensile Strength
Yield Strength (0.2%)
Density
Melting Point
Elongation
304 / 304L / 304H
≥ 515 MPa
≥ 205 MPa (30,000 psi)
8.0 g/cm³
1,400°C
≥ 35%
316 / 316L / 316H
≥ 515 MPa
≥ 205 MPa (30,000 psi)
8.0 g/cm³
1,400°C
≥ 35%
Chemical Composition of Bright Annealed SS Pipe
Grade
C (max)
Mn (max)
Si (max)
Cr
Ni
Mo
P (max)
S (max)
304L
0.035
2.00
1.00
18.0-20.0
8.0-12.0
-
0.045
0.030
304
0.08
2.00
1.00
18.0-20.0
8.0-11.0
-
0.045
0.030
316L
0.035
2.00
1.00
16.0-18.0
10.0-14.0
2.0-3.0
0.045
0.030
Where Are Bright Annealed Tubes Used?
BA tubes are the go-to solution whenever a combination of surface purity, corrosion resistance, and dimensional precision is required. Metinox Overseas serves a diverse spectrum of industries across India and globally.
Industry
Application
Why BA Tubes?
Pharmaceutical & Biotech
API transfer lines, bioreactor piping, CIP/SIP systems
Ra < 0.4 µm prevents biofilm; easy sterilisation
Semiconductor
Ultra-pure gas distribution (N2, O2, H2, specialty gases)
Equivalent International Standards for BA Stainless Steel Tubes
By Region
American (ASTM)
UNS
European (EN)
British (BS)
Japanese (JIS)
TP304L
S30403
1.4307
304S11
SUS304L
TP304
S30400
1.4301
304S31
SUS304
TP316L
S31603
1.4404
316S11
SUS316L
TP316
S31600
1.4401
316S31
SUS316
TP321
S32100
1.4541
321S31
SUS321
TP347
S34700
1.4550
347S31
SUS347
European Standard Tolerances (EN 10296-2 / EN 10312 / EN 10217-7)
Standard
Manufacturing Type
OD Class
OD Range (mm)
WT Tolerance
EN10296-2
Welded Tubes
D3
≤ 168.3
T3
EN10296-2
Welded Tubes
D2
> 168.3
T3
EN10296-2
Welded Tubes
D4
≤ 114.3
T3
EN10312
Welded Tubes
D3 - D4
Series 2
T3 - T4
EN10217-7
Welded Tubes
D3
≤ 168.3
T3
Chinese Standards (GB)
Specification
Manufacturing
OD (mm)
OD Tolerance
WT (mm)
WT Tolerance
GB/T14976
Cold Rolled Seamless
10-30
±0.2
> 3
-10%
GB/T14976
Cold Rolled Seamless
6-10
±0.15
1-3
-12.5%
GB13296
Cold Rolled Seamless Pipe
> 30-50
±0.3
> 3
-0%
GB13296
Cold Rolled Seamless Pipe
6-30
±0.15/-0.2
1-3
-0%
Quality Assurance at Metinox Overseas
Every bright annealed tube manufactured by Metinox Overseas passes through a multi-stage quality inspection protocol before shipment. We maintain full traceability from raw material heat numbers to final MTC documentation.
Test Type
Method
Standard Compliance
Ultrasonic Testing (UT)
Full-length automated UT for wall defects
ASTM E213 / EN 10246-7
Eddy Current Testing (ECT)
Electromagnetic surface defect detection
ASTM E309 / EN 10246-3
Hydrostatic Pressure Test
Pressure hold at specified test pressure
ASTM A269 / A249
Chemical Analysis
Spark OES / XRF for grade verification
ASTM E1015 / EN 10204
Mechanical Testing
Tensile, yield, hardness, elongation
ASTM A370 / EN ISO 6892
Surface Roughness Measurement
Profilometer Ra measurement (inner & outer)
ISO 4287 / SEMI F38
Dimensional Inspection
OD, WT, length, straightness 100% check
Per ASTM / ASME tolerances
Intergranular Corrosion Test
Sensitisation test for welded tubes
ASTM A262 Practice E
Documentation Provided
Mill Test Certificate (MTC)
EN 10204 3.1 / 3.2
Chemical & Mechanical Test Report
Per applicable ASTM/EN standard
Dimensional Inspection Report
OD, WT, Length per order spec
Pressure Test Certificate
Where applicable
Packaging & Dispatch Note
With heat code, grade, size
Packaging, Export Compliance & Delivery Schedule
Packaging Options
Tri-Wall Corrugated Export Box - Standard for international shipments
A Bright Annealed (BA) Tube is a stainless steel tube that has been heat-treated inside a sealed furnace filled with a protective hydrogen or nitrogen-hydrogen atmosphere. Unlike standard annealing performed in air, bright annealing prevents surface oxidation, producing a clean, oxide-free, bright surface with a roughness below 0.4 µm. The result is superior corrosion resistance, restored ductility, and a hygienic inner bore - making BA tubes indispensable in pharmaceutical, semiconductor, food processing, and dairy applications.
Our standard Bright Annealed Tubes achieve an inner surface Ra of less than 0.4 µm. For ultra-high-purity semiconductor and biotechnology applications, we also supply Electropolished (EP) tubes with Ra values between 0.04 and 0.24 µm, compliant with ASME BPE and SEMI F17/F19 standards.
Metinox Overseas supplies BA tubes in grades 304, 304L, 316, 316L, 316Ti, 321, 347, 904L, and duplex 2205, among others. The most frequently specified grades for hygienic and high-purity applications are 304L and 316L due to their low carbon content and superior corrosion performance after welding.
Our BA tubes are manufactured to ASTM A249, ASTM A268, ASTM A269, ASME BPE, SEMI F17, SEMI F19, ANSI/ASME B36.19M, and B46.1 standards. European equivalents including EN 10296-2, EN10312, and EN 10217-7 are also available. All tubes are supplied with MTC EN 10204 3.1 or 3.2 as required.
We supply Bright Annealed Tubes from 6 mm to 76.2 mm OD, with wall thickness ranging from 0.5 mm to 3.38 mm, in both seamless and welded configurations. Custom sizes outside this range are available on inquiry with minimum order quantities.
Yes. We supply tubes in fixed cut lengths with a tolerance of ±3.2 mm (±1/8"), or in random lengths (+50 mm / -0 mm). Custom cut-to-length services are available for project-specific requirements, with no additional lead time for standard sizes.
Every tube undergoes ultrasonic testing (UT), eddy current testing (ECT), hydrostatic pressure testing, chemical composition analysis, dimensional inspection, surface roughness measurement (Ra), and mechanical property testing. Full documentation - including MTC, test reports, and dimensional inspection reports - is provided with each shipment.
Yes. Metinox Overseas regularly exports to the UAE, Saudi Arabia, Qatar, Oman, Kenya, Nigeria, Singapore, Malaysia, Indonesia, Europe, the UK, and the Americas. We handle all export documentation, ECGC compliance, and can arrange shipment on FOB, CFR, or CIF terms.
We aim to respond to all inquiries within 24 business hours. To receive a precise quote, please share the grade, OD, wall thickness, finish, standard, quantity, and required documentation. You can email sales@metinoxoverseas.com or use the inquiry form on our website.
Export shipments are packed in tri-wall corrugated boxes, with individual tubes wrapped in paper/poly sleeves to protect the bright annealed surface. Scored cardboard dividers prevent tube-to-tube contact. Custom packaging per importer/customer requirements is available.
Get a Competitive Quote for Bright Annealed Tubes - Today
Ready to source high-quality Bright Annealed Tubes that meet your exact specifications and compliance requirements? Metinox Overseas offers expert technical support, competitive pricing, and reliable delivery worldwide. Share your requirements and receive a detailed quote within 24 hours.
REQUEST A QUOTE NOW - Email: sales@metinoxoverseas.com | Call: +91 22-67437598 | +91 22-40213914
Enquire Now
Get pricing within 24 hours!
Looking to Enquire or Place an Order?
Share your requirement and our team will respond with pricing, availability, and technical details.
