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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 thick wall BA tube is a bright annealed tube with a heavy wall relative to its outside diameter — up to 12mm*4mm (0.157") at Harmonypipe. The heavy wall construction delivers high pressure-bearing capacity, structural rigidity and durability in severe service, while the BA finish keeps the bore smooth, clean and oxidation-resistant.

Applications
Thick wall BA tubes are widely used where high pressure, mechanical strength and long-term reliability are critical:
·High-Pressure Hydraulic Systems — hydraulic power units, injection machines, presses and test benches.
·Oil & Gas — downhole control lines, chemical injection lines and wellhead control panels.
·High-Pressure Gas Delivery — cylinder filling lines, CNG systems and high-pressure gas manifolds.
·Chemical & Petrochemical — high-pressure process piping, reactor feed and dosing lines.
·Power Generation — high-pressure steam sampling, boiler instrumentation and feedwater lines.
·Offshore & Marine — subsea control umbilicals, high-pressure seawater and hydraulic lines.
·Pressure Equipment — autoclaves, pressure test systems and high-pressure research apparatus.

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.