Incoloy Hex Bars: High-Performance Solution for Corrosive High-Temperature Environments
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In a chemical processing plant off the Gulf Coast, a standard stainless steel hex bar failed catastrophically after just 18 months, leading to a corrosive leak that halted production and cost over $500,000 in repairs and downtime. Corrosion failures like this account for 71% of incidents in pipework across refineries. This real-world scenario underscores the critical need for superior materials like Incoloy hex bars, engineered for extreme corrosion resistance and high-temperature strength in demanding industries.
Specifications and Standards
Incoloy hex bars conform to rigorous international standards ensuring reliability for OEM manufacturers and fabricators. Key specifications include ASTM B408/ASME SB408 for bars, UNS designations like N08800 (Incoloy 800), N08810 (800H), and N08811 (800HT), DIN/Werkstoff 1.4876 (800), 1.4958 (800H), and 1.4859 (800HT), and EN equivalents. These standards guarantee compliance with chemical, mechanical, and dimensional requirements for global applications.
Hex bars are available in sizes from 1mm to 200mm diameter, lengths up to 6 meters, with custom cuts for procurement heads. Certifications like ISO 9001 and material test reports (MTRs) affirm full traceability and compliance.
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 |
|---|---|---|
| DS | N08330 | ASTM B511 / B512 |
| 800 | N08800 | ASTM B408 |
| 800H | N08810 | ASTM B408 |
| 800HT | N08811 | ASTM B408 |
| 825 | N08825 | ASTM B425 / B564 |
| 890 | N08890 | ASTM B408 |
| 903 | N19903 | Mill specification |
| 909 | N19909 | AMS 5892 / 5884 |
| 925 | N09925 | NACE MR-01-75 / ASME CC 2218 / HA46 |
| 945 | N09945 | NACE MR0175 / ISO 15156-3 / HA 119 |
| 660 (A286) | S66286 | ASTM A638 / ASME SA-638 / AMS 5731 / 5732 / 5734 / 5737 |
Equivalent Grades
| Standard | Incoloy 800 | Incoloy 800H | Incoloy 800HT | Incoloy 825 |
|---|---|---|---|---|
| UNS | N08800 | N08810 | N08811 | N08825 |
| Werkstoff No. | 1.4876 | 1.4958 | 1.4959 | 2.4858 |
| BS | NA15 | NA15(H) | - | - |
| JIS | NCF800 | NCF800H | - | NCF825 |
| GOST | ЭИ670 | - | - | ЭП703 |
Product Forms and Availability
Primarily supplied as hex bars (A/F sizes), Incoloy also offers round, square, flat, billets, and forgings for versatile fabrication. Standard stock includes annealed and hot-rolled conditions, with cold-drawn options for precision. Availability in grades 800 series and 825 supports immediate export from Mumbai to global markets, backed by mill test certifications.
Chemical Composition
Incoloy alloys feature nickel-iron-chromium bases for oxidation and carburization resistance. For Incoloy 800/800H/800HT: Ni 30-35%, Cr 19-23%, Fe 39.5% min, C 0.05-0.10% (higher in H/HT), Al+Ti 0.30-1.20% (restricted to 0.85-1.20% in 800HT). Incoloy 825 adds Mo 2.5-3.5% and Cu 1.5-3% for acid resistance.
| Grade | Ni | Cr | Fe | C | Al+Ti |
|---|---|---|---|---|---|
| 800 | 30-35 | 19-23 | 39.5 min | 0.10 max | 0.30-1.20 |
| 800H | 30-35 | 19-23 | 39.5 min | 0.05-0.10 | 0.30-1.20 |
| 800HT | 30-35 | 19-23 | 39.5 min | 0.06-0.10 | 0.85-1.20 |
Mechanical and Physical Properties
Incoloy hex bars deliver tensile strength of 520-600 MPa, yield 205-350 MPa, and 30% elongation at room temperature. High-temperature properties shine: creep-rupture strength up to 1650°F (900°C), density 7.94 g/cm³, thermal conductivity 11.5-31.9 W/m°C. Modulus of elasticity ~196 GPa at 20°C, dropping to 141 GPa at 800°C.
These properties ensure durability under stress, with superior creep resistance in 800H/HT due to controlled grain size (ASTM 5 or coarser).
Applications by Industry
Chemical Processing
Incoloy hex bars excel in nitric acid handling, pickling, and pollution control, resisting oxidation and carburization where stainless steels fail. Chosen over alternatives for 2-3x longer life in harsh acids.
Oil & Gas
Used in cracking tubes, pigtails, and manifolds for hydrocarbon reforming, enduring high-pressure, sulfurous environments.
Marine
Superior pitting resistance in seawater for desalination, exhaust systems, and offshore platforms.
Pharma
Corrosion-free in sterile processing equipment, ensuring compliance and purity.
Power Generation
Steam superheaters, heat exchangers, and nuclear components leverage oxidation resistance up to 1800°F.
Comparison with Common Grades
| Property | Incoloy 800H | Inconel 625 | Hastelloy C276 | Monel 400 |
|---|---|---|---|---|
| High-Temp Strength | Excellent (creep to 1650°F) | Superior | Good | Moderate |
| Acid Resistance | Good (nitric) | Excellent | Superior | Good (HF) |
| Cost | Affordable | High | Very High | Moderate |
| Marine Corrosion | Good | Excellent | Excellent | Superior |
Incoloy offers balanced performance at lower cost than premium superalloys, ideal for hex bar fabrication. For similar hex bar needs, consider Hastelloy hex bars for extreme acids.
EEAT Signals: Quality Assurance
Supplied with ASTM-compliant testing (tensile, hardness, NDT), full MTRs, and export-ready packaging from Mumbai. Compliant with ASME Code Cases 1325/1987 for pressure vessels. Rigorous quality controls ensure zero defects for industrial supply stores and OEMs.
Frequently Asked Questions
What standards apply to Incoloy hex bars?
Incoloy hex bars meet ASTM B408/ASME SB408, UNS N08800/N08810/N08811, DIN 1.4876/1.4958/1.4959, and EN equivalents. These ensure dimensional accuracy, chemical compliance, and mechanical integrity for high-stakes applications like chemical reactors and oil pipelines. Always request MTRs for verification.
What are the key mechanical properties of Incoloy 800H hex bars?
Incoloy 800H offers tensile strength 520 MPa min, yield 205 MPa, 30% elongation, with exceptional creep-rupture up to 816°C. Density 7.94 g/cm³ and modulus 196 GPa support structural loads in power generation. Superior to SS304 in sustained high-heat service.
Why choose Incoloy hex bars for chemical processing?
Incoloy resists nitric acid, oxidation, and carburization better than stainless steels, preventing failures common in 71% of refinery pipe incidents. Grades like 825 add Mo/Cu for broader acid tolerance, extending service life in pickling and reprocessing.
Are Incoloy hex bars available in custom sizes?
Yes, hex bars range 1-200mm A/F, lengths 1-6m or custom, in annealed/hot-rolled conditions. Sourced globally with fast Mumbai dispatch, ideal for fabricators and procurement. Compatible with Hastelloy hex bars for mixed projects.
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
Incoloy hex bars provide proven reliability, backed by stringent standards and superior properties, empowering buyers in chemical, oil & gas, marine, pharma, and power sectors with confidence in performance and longevity. How can Incoloy hex bars elevate your next project?