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Bright annealing (BA), is a part of stainless steel annealing process which is performed under reducing atmosphere or vacuum protection. The heating process gives the surface resistance to oxidation and a certain brightness. A thin wall BA tube is a bright annealed tube whose wall thickness is small relative to its outside diameter — down to 0.2mm (0.008") at Harmonypipe. The thin wall construction reduces weight, improves heat transfer efficiency, and lowers material cost, while the BA finish keeps the bore clean, smooth and oxidation-resistant.

Thin wall BA tubes are widely used where light weight, fast thermal response and high cleanliness matter more than pressure capacity:
·Instrumentation & Control Tubing — precise measurement and signal lines in process plants, analyzers and control panels.
·Capillary & Sampling Lines — low internal volume gives fast response for gas/liquid sampling systems.
·Chromatography (HPLC / GC) — analytical instruments requiring a clean, smooth, inert bore.
·Medical & Pharmaceutical Devices — lightweight, high-purity fluid paths for equipment and instruments.
·Heat Exchangers & Condensers — thin wall maximizes heat transfer efficiency between media.
·Semiconductor Ultra-Pure Gas Delivery — bright annealed inner surface minimizes particle generation and moisture adsorption.
·Aerospace & Automotive — weight-saving hydraulic sensing and fuel lines.

1. 2507 (S32750) is a super duplex stainless steel; the EN designation is 1.4410 (X2CrNiMoN25-7-4).
2. 2205 (S31803) and S32205 share the EN 1.4462 designation; S32205 is the modern variant with tighter N control.
3. Hastelloy C-22 (UNS N06022 / EN 2.4602) is a Ni-Cr-Mo alloy with high resistance to oxidizing and reducing media.
4. Hastelloy C-276 (UNS N10276 / EN 2.4819) is the most widely used Ni-Cr-Mo alloy; often called the "universal" corrosion-resistant alloy.
5. Monel 400 (UNS N04400 / EN 2.4360) is a Ni-Cu alloy with excellent resistance to seawater, hydrofluoric acid, and reducing media.
6. Inconel 600 (UNS N06600 / EN 2.4816) is a Ni-Cr-Fe alloy with outstanding high-temperature oxidation resistance (up to 1100°C) and resistance to stress corrosion cracking.
7. Incoloy 800 (UNS N08800 / EN 1.4876) is a Ni-Fe-Cr alloy offering good high-temperature performance at lower nickel content; widely used in petrochemical furnace tubes and heat-treatment equipment. Variants: 800H (N08810 / 1.4958), 800HT (N08811 / 1.4959).
8. GH3030 (GB/T 14992) is a Chinese national-standard solution-strengthened Ni-Cr base superalloy; originally developed from Russian EI435. Main composition: Ni bal., Cr 19~22%, Ti 0.15~0.35%. Service temperature up to 800°C; good oxidation resistance, formability and weldability. Used in aero-engine combustors, afterburners and high-temperature structural parts. It has NO direct UNS/ASTM/EN equivalent (marked "—"); performance is similar but not identical to Inconel 600.

Nominal Length: 6 meters / each, or customized.
Thin wall capability: wall thickness as thin as 0.2mm (0.008") is available for precision instrumentation, capillary and heat-exchanger applications, subject to size and material.
If higher outside diameter tolerance is required, welcome to contact us.

Surface Quality
OD & WT, Length, Straightness, roughness BA and endoscopy.
Chemical Composition
Spectrum analysis.
Mechanical Test
Tensile，Yield， Elongation (%，)Hardness (HRB)
NDT (Non-Destructive Testing)
ET (Eddy Current testing).
PMI (Positive Material Identification)
Direct-reading spectrometer.
Marking and Color Coding
Marking and color coding available if required.

All tubes are protected with caps at both ends + PE bag + wooden case.
1. End Capping — Both ends of each tube are protected with caps.
2. PE Bag — Tubes are bagged in polyethylene for cleanliness.
3. Wooden Case — Finally placed in wooden cases for maximum protection during shipment.