Haynes Alloy Hollow Bars: Unmatched Oxidation Resistance for Extreme Service
A Southeast Asia FGD system suffered $8M losses when Inconel 625 tubes spalled after 18 months in 1600°F flue gas-Haynes 230 hollow bars maintained integrity for 72+ months continuously.
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High-temperature oxidation claims 28% of power plant component failures, with conventional Ni-Cr alloys losing 40-60% thickness in cyclic service. Haynes Alloy Hollow Bars, specifically UNS N06230 per AMS 5878, leverage advanced solid solution strengthening and reactive element additions for unprecedented durability.
These nickel-chromium-tungsten-molybdenum alloys serve OEM turbine manufacturers, fabricators, procurement heads, and industrial suppliers across power generation, chemical processing, oil & gas, marine, and pharma heating systems. DIN 2.4733 compliant with aerospace heritage. Detailed engineering data follows.
Specifications and Standards for Haynes Alloy Hollow Bars
Haynes Hollow Bars meet the most demanding high-temperature specifications:
- UNS N06230: Solid solution Ni-Cr-W-Mo alloy with rare earth additions.
- AMS 5878 / ASME SB-462: Aerospace sheet/plate/bar specification.
- DIN 2.4733 / EN 2.4733: NiCr30Tu for European furnace construction.
- Additional: NACE MR0175, AD 2000 Merkblatt W2/3 pressure certification.
Requires solution anneal 1175°C (2150°F) + stabilization 950°C to optimize oxide adherence.
| Supplier & Manufacturer | Aurico Alloys LLP |
|---|---|
| Price | INR 5,000 – 15,000 per kg. Indicative USD 60 – 175 per kg; quoted against grade, form, size and quantity. |
Specifications by Grade – Rod and bar
A specification is written for a product form. The standards below are the ones that cover rod and bar; the plate, bar and tube specifications for these grades are different documents and are listed on their own pages.
| Grade | UNS | Rod and bar specification |
|---|---|---|
| 25 | R30605 | AMS 5759 |
| 188 | R30188 | AMS 5772 |
| 214 | N07214 | Mill specification |
| 230 | N06230 | ASTM B572 |
| 242 | N10242 | ASTM B573 |
| 282 | N07208 | ASTM B637 / AMS 5915 |
Product Forms and Dimensional Availability
Haynes Alloy Hollow Bars engineered for high-temperature pressure service:
- OD Range: 40-450mm; ID: 25-400mm; Wall: 6-35mm.
- Lengths: 3.5-9m standard, precision trepanned from forged rings.
- Conditions: Solution annealed + stabilized, oxide-free surface.
Complement with Haynes hex bar stock for manifolds and transition fittings. Global export from Mumbai precision inventory.
Frequently Asked Questions (FAQs)
What applications use Haynes 230 hollow bars?
Haynes 230 hollow bars (UNS N06230) excel in FGD systems, ethylene crackers, gas turbine transitions where cyclic oxidation destroys Inconel 617. AMS 5878 specs provide 15x better scale retention through 2100°F, enabling thinner walls, lower thermal stress in power/chemical service.
How does Haynes 230 compare to Inconel 617 oxidation resistance?
230 loses 0.15 vs 617's 0.85 mg/cm² after 500h at 2000°F due to La additions improving Cr₂O₃ adherence. Haynes maintains 25 ksi strength where 617 softens to 18 ksi. Cyclic tests show 230 surviving 2000 cycles vs 617's 800 before spallation.
What heat treatment produces optimal Haynes hollow bars?
Solution anneal 2150°F (1175°C)/1h WQ + stabilize 1825°F (1000°C)/1h AC. Critical second stabilization develops beneficial M₆C/M₂₃C₆ carbides. AMS 5878 requires Class 2 furnace uniformity ±15°F, preventing sigma phase embrittlement. Dual cycle essential for cyclic oxidation resistance.
What sizes are available for Haynes alloy hollow bars?
OD 40-450mm, ID 25-400mm, walls 6-35mm from vacuum induction melted + ESR forged stock. AMS 5878 tolerances ±0.010"/ft taper. Solution + stabilized condition standard; custom sizes within 8 weeks. Mumbai suppliers maintain critical furnace tube dimensions.
What quality tests certify Haynes hollow bars?
100% AMS 2631 UT Level 3, cyclic oxidation per customer spec, tensile/creep rupture AMS 2371, PMI, grain size ASTM E112 #4 minimum. EN 10204 3.2 includes chemistry cert, heat treatment verification, oxide scale thickness measurement. Zero defects policy.
Global Export Destinations
We ship worldwide from Mumbai. See every destination we export to on our export markets page.
Domestic Supply Network
We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.
Conclusion: Haynes Alloy Hollow Bars Ultimate High-Temperature Confidence
UNS N06230 Haynes Alloy Hollow Bars transform furnace economics with 10-15x oxidation life extension and microstructural stability through 2100°F cyclic service. AMS 5878 aerospace heritage eliminates material risk for critical power and chemical applications.
Which high-temperature oxidation challenge threatens your process reliability?