Alloy 59 Plates | Next-Generation Ni-Cr-Mo Plates for Ultra-Corrosive Chemical, Marine & Power Service
Table of Contents:
A European flue-gas desulfurization (FGD) absorber handling hot, chloride-contaminated sulphuric and nitric acid mist had already chewed through rubber-lined carbon steel and then 904L and Alloy 20 plates, forcing shell repairs every 18–24 months and driving outage costs into seven figures. When the owner finally rebuilt critical zones with Alloy 59 Plates a Ni‑Cr‑Mo alloy with about 23% chromium and 16% molybdenum designed specifically for mixed oxidizing and reducing acids the corrosion rate in standard boiling acid tests dropped by an order of magnitude compared with earlier plate materials, and inspection reports showed dramatically lower pitting and weld attack after years in service.
Alloy 59 (UNS N06059, W.Nr. 2.4605) is a nickel‑chromium‑molybdenum alloy with very low carbon and silicon content, delivering high strength and outstanding resistance to pitting, crevice corrosion and stress‑corrosion cracking in both oxidizing and reducing media. Its chemistry (≈23% Cr and 15–16.5% Mo with minimal Fe) and lack of tungsten provide better thermal stability than many older Ni‑Cr‑Mo alloys, and testing shows significantly lower corrosion rates than common C276‑type alloys in aggressive sulphuric acid and mixed “green death” environments, while achieving demanding NACE MR0175 / ISO 15156 sour‑service levels used in oil & gas.
For procurement heads, process engineers, fabricators, OEMs and hardware or industrial supply stores supporting chemical, oil & gas, marine, pharma, and power plants, Alloy 59 plates offer a clear upgrade path from high‑alloy stainless steels (such as 904L) and even from versatile workhorses like C276 when maximum uptime and life in mixed acids, chlorides and FGD liquors are required. Alloy 59 plate delivers room‑temperature yield strengths above about 190 MPa, tensile strengths above roughly 540–550 MPa and elongation above 40%, retaining good impact toughness even at cryogenic temperatures around −196 °C, which makes it suitable for both cold and hot, highly corrosive duties.
Aurico Alloys LLP supports these projects as a trusted Alloy 59 Plates supplier, manufacturer and stockist in India with export capability abroad, offering authentic plate produced to recognised UNS N06059 and 2.4605 practices, backed by heat treatment control, EN 10204 test certificates and global logistics.
High-quality Alloy 59 Plates ready for industrial use.
Specification Overview
| Supplier & Role | Aurico Alloys LLP – Alloy 59 plates supplier, stockist, exporter in India to abroad |
|---|---|
| Alloy Name | Alloy 59, also known as Haynes 59, Hastelloy 59, Nicrofer 5923hMo, ATI 59 |
| UNS & Werkstoff | UNS N06059, W.Nr. 2.4605 |
| Typical Plate Standard | ASTM B575 for nickel‑chromium‑molybdenum plate, sheet and strip including UNS N06059 |
| Thickness Range | 4.75 mm – 150 mm |
| Key Corrosion Features | Excellent resistance to pitting, crevice corrosion and stress‑corrosion cracking in chlorides; high resistance in mixed oxidizing and reducing mineral acids including contaminated sulphuric and “green death” solutions |
UNS & Equivalent Grades
| Property | Value |
|---|---|
| UNS number | N06059 |
| Werkstoff / EN number | 2.4605 |
| EN designation | NiCr23Mo16Al |
| Density | 8.6 g/cm3 |
| Melting range | 1310-1360 °C |
| Specific heat capacity (20 °C) | 414 J/kg·K |
| Thermal conductivity (20 °C) | 10.4 W/m·K |
| Electrical resistivity (20 °C) | 126 µΩ·cm |
| Modulus of elasticity (20 °C) | 210 GPa |
| Relative magnetic permeability (20 °C) | 1.001 |
| Plate, sheet and strip specification | ASTM B575 |
Identifiers and physical constants for Alloy 59. A dash means no such designation is published for this grade.
Stock & Product Availability
As an Alloy 59 plates stockist, Aurico Alloys LLP can provide plate thicknesses suitable for FGD absorber walls, scrubber internals, chemical reactors, column internals, tube sheets and channel heads, typically from a few millimetres up to heavy plate dimensions used in pressure boundaries. Cut‑to‑size, bevel cutting and edge preparation enable fabricators and OEMs to reduce machining time while still meeting ASTM B575 and associated fabrication requirements for severe‑service equipment.
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Iron (Fe) | — | 1.5 |
| Chromium (Cr) | 22.0 | 24.0 |
| Nickel (Ni) | — | Balance |
| Molybdenum (Mo) | 15.0 | 16.5 |
| Carbon (C) | — | 0.01 |
| Sulfur (S) | — | 0.01 |
| Manganese (Mn) | — | 0.5 |
| Silicon (Si) | — | 0.1 |
| Copper (Cu) | — | 0.5 |
| Phosphorus (P) | — | 0.015 |
| Aluminium (Al) | 0.1 | 0.4 |
| Cobalt (Co) | — | 0.3 |
Composition limits for Alloy 59. These are specification limits for the grade, not measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Mechanical & Physical Properties
| Property | Typical Value for Alloy 59 Plate |
|---|---|
| Yield Strength (Room Temp) | >190 MPa (0.2% offset) |
| Tensile Strength (Room Temp) | >545 MPa |
| Elongation | >40 % |
| Impact Energy at 20 °C | >200 J/cm² |
| Impact Energy at −196 °C | >160 J/cm² |
| Yield Strength at 400 °C | >175 MPa |
| Tensile Strength at 400–450 °C | >525 MPa with elongation still above about 40 % |
| Relative Magnetic Permeability | ≈1.001 at 20 °C (essentially non‑magnetic) |
Applications & Benefits
- Chemical & Oil & Gas: Alloy 59 plates in reactors, agitator vessels, scrubbers, and column internals deliver markedly lower corrosion rates than C276 and high‑alloy stainless steels in boiling sulphuric acid and mixed acid/chloride streams, with tests showing corrosion rates around 0.625 mm/a versus 5–6 mm/a for C276 in ASTM G28A and 0.1 mm/a versus ≈1.5 mm/a in G28B, helping extend inspection intervals and reduce unplanned outages.
- Marine & Power Generation: In FGD absorbers, stack liners, condensers, and seawater‑contaminated sections of heat exchangers, Alloy 59’s combination of high chromium and molybdenum with very low carbon and silicon provides superior pitting, crevice and SCC resistance compared with 904L and many nickel alloys, making it well suited to long‑life plate fabrications exposed to cycling temperatures and chlorides.
- Pharma & High‑Purity Systems: For mixed acid cleaning, waste‑neutralisation and off‑gas treatment where contamination from corrosion products is unacceptable, Alloy 59 plate offers broad resistance to nitric, phosphoric, sulphuric and hydrochloric acids, including contaminated streams, while maintaining weldability with low hot‑cracking tendency, which is essential for hygienic, fully welded constructions.
FAQ & Search Trends
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
Alloy 59 plates from Aurico Alloys LLP, produced to UNS N06059 / 2.4605 chemistry and ASTM B575‑type mechanical and corrosion performance expectations, give chemical, oil & gas, marine, pharma and power‑generation users a high‑strength, high‑alloy Ni‑Cr‑Mo plate solution that outperforms 904L, Alloy 20 and even many C276‑type alloys in the most aggressive mixed acids and chloride environments are your most critical absorbers, scrubbers, reactors and heat‑transfer surfaces still relying on plate materials that corrosion tests show are clearly outclassed by Alloy 59?