Haynes® Alloy Hex Bars: Superior Resistance in Extreme Heat and Corrosion
Table of Contents:
In a petrochemical reformer, standard nickel alloy components oxidized rapidly at 1100°C, leading to tube rupture and a $2M shutdown—failures exacerbated by thermal fatigue where cobalt-based alloys excel. Haynes® hex bars address these challenges with unmatched oxidation resistance and fabricability for power generation and chemical processing.
Specifications and Standards
Haynes hex bars meet ASTM B572 (Haynes 25/UNS R30605), ASTM B435 (188/UNS R30188, 230/N06230), AMS 5772/5790, DIN 2.4964 (25) and 2.4686 (188). These ensure structural stability up to 1200°C for OEM turbine and furnace fabricators. Hex sizes 2-100mm A/F, lengths to 6m, with VIM/ESR cleanliness.
Full MTRs and NDT compliance support global procurement from Mumbai exporters.
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 |
Equivalent Grades
| Alloy | UNS | DIN/Werkstoff | AMS | Common Name |
|---|---|---|---|---|
| Haynes 25 | R30605 | 2.4964 | 5772 | L-605 |
| Haynes 188 | R30188 | 2.4683 | 5790 | - |
| Haynes 230 | N06230 | 2.4733 | 5878 | - |
| Haynes 556 | R30556 | 1.4883 | - | - |
| Price | INR 5,000 – 15,000 per kg. Indicative USD 60 – 175 per kg; quoted against grade, form, size and quantity. |
Product Forms and Availability
Hex, round (3-800mm), square, flat bars; forgings and billets for custom fabrication. Solution-annealed or age-hardened stock supports immediate dispatch. Nimonic hex bars complement for precipitation-hardened turbine needs.
Chemical Composition
Cobalt-based Haynes alloys prioritize oxidation resistance: Haynes 25 Co 50% bal., Cr 19-21%, W 14-16%, Fe 3% max, C 0.05-0.15%. Haynes 188 Ni 20-24%, La 0.03-0.15%; 230 adds Mo 1-3%, Nb 0.3-1%.
| Alloy | Co | Cr | W | Ni | Fe | C |
|---|---|---|---|---|---|---|
| 25 | Bal | 19-21 | 14-16 | 10-15 | 3 max | 0.05-0.15 |
| 188 | Bal | 20-24 | 13-16 | 20-24 | 3 max | 0.05-0.15 |
| 230 | Bal | 20-24 | - | Bal min | 3 max | 0.08-0.15 |
Mechanical and Physical Properties
Haynes 25: Tensile 1000 MPa, yield 520 MPa, 55% elongation at RT; retains 65 ksi at 980°C. Density 8.9 g/cm³ (25), thermal exp. 12.8 µm/m°C, conductivity 29 W/m°C. Excellent fabricability despite high strength.
Creep superior to nickel alloys up to 1150°C, vital for combustion zones.
Applications by Industry
Chemical Processing
Pyrometer tubes, catalyst grids resist carburization where Inconel degrades.
Oil & Gas
Reformer tubes, cracking furnace parts endure H2-H2S at 1100°C.
Marine
Gas turbine hot sections, exhaust systems handle salt-oxidation.
Pharma
High-purity furnace components maintain integrity in clean environments.
Power Generation
Combustion cans, transition ducts offer 2x life vs alternatives in cyclic service.
Comparison with Common Grades
| Property | Haynes 25 | Inconel 625 | Hastelloy X | 230 |
|---|---|---|---|---|
| Max Use Temp (°C) | 1150 | 980 | 1200 | 1150 |
| Oxidation Resist. | Superior | Good | Excellent | Superior |
| Tensile RT (MPa) | 1000 | 930 | 655 | 1000 |
| Fabricability | Excellent | Good | Fair | Good |
| Cost/kg | High | High | Very High | High |
Haynes excels in weldability and ductility for complex fabrications.
EEAT Signals: Quality Assurance
ASTM-tested (tensile, creep-rupture, metallography), 100% NDT, ASME N-CA compliant with MTRs. Export-certified packaging from Mumbai for supply chain reliability.
Frequently Asked Questions
What standards apply to Haynes alloy hex bars?
Haynes 25: ASTM B572/AMS 5772, UNS R30605, DIN 2.4964; 188: ASTM B435/AMS 5790, R30188. Validate high-temp oxidation via solution anneal + tests. Essential for turbine OEMs.
Key properties of Haynes 25 hex bars?
Tensile 1000 MPa, yield 520 MPa, 55% elong., excels to 1150°C creep/oxidation. Density 8.9 g/cm³, superior fabricability vs nickel alloys for aero/chemical.
Why choose Haynes for gas turbines?
Unmatched oxidation/thermal stability prevents reformer failures; cobalt matrix yields 2x cyclic life. Preferred over Inconel for combustors where ductility matters.
Custom sizes for Haynes hex bars?
Hex 2-100mm A/F, lengths custom; round to 800mm. Annealed stock ready; pairs with Nimonic hex bars for turbine projects. Mumbai export-fast.
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.
Haynes alloy hex bars stand as the authoritative choice for extreme environments, validated by standards and properties that ensure longevity in chemical, power, and turbine applications. How will Haynes hex bars strengthen your critical components?