01
Alloy 59 Bar and Rod
Bar and rod to ASTM B574 from 6 to 300 mm diameter, supplied solution annealed and quenched.
View Alloy 59 Bar and Rod →Alloy 59 — UNS N06059 Composition & Forms
Nickel-chromium-molybdenum grade with a very low iron and silicon matrix, for acid plant that switches between oxidising and reducing duty.
Iron Floor Explained
The page sets out the 1.5% iron ceiling and the silicon limit that hold the passive film steady.
Welded Condition Documented
Consequently, the quench record and the interpass limit travel with the heat number.
Nine Documents, One Melt
Bar, flat product, and tube trace to a single heat under one documentation set.
MATERIAL OVERVIEW
About Alloy 59
Alloy 59 is a nickel-chromium-molybdenum alloy carrying the UNS designation N06059. Iron holds at 1.5% maximum, roughly a quarter of the ceiling in C-276. Consequently, the matrix behaves almost like a pure solid solution, and the passive film recovers faster after an upset.
Three routes reach the market, and each one carries its own ordering detail. Bar sits on the Alloy 59 Bar and Rod page, tubular product on Alloy 59 Pipe and Tube, and flat product on Alloy 59 Plate and Sheet. Therefore, one heat serves all three routes under a single certificate set.
However, the grade answers to Nicrofer 5923 hMo in the European trade, and that name belongs to VDM Metals.
KEY FEATURES
Key Features of Alloy 59
Alloy 59 carries the UNS N06059 designation and answers to W.Nr. 2.4605. Iron holds at 1.5% maximum and silicon at 0.10% maximum, so the matrix stays close to a pure nickel-chromium-molybdenum solid solution. That purity lifts resistance to chloride pitting and to mixed acids where oxidising and reducing conditions alternate. Southerly Alloy supplies UNS N06059 bar, tube, pipe, and flat product under ASTM B574, B575, B622, B619, and B626.
Alloy 59
Low Iron Matrix
Iron at 1.5% maximum keeps the alloy close to a clean nickel-chromium-molybdenum solid solution.
01
Oxidising and Reducing Together
Chromium at 22 to 24% plus molybdenum at 15 to 16.5% cover both families in one heat.
02
Chloride Pitting Resistance
A pitting resistance equivalent near 75 sits at the top of the wrought nickel family.
03
Silicon Held Tight
Moreover, silicon at 0.10% maximum slows the phases that drain corrosion resistance after welding.
04
Carbon at the Floor
Carbon at 0.010% maximum limits carbide precipitation, so weld zones hold their chemistry.
05
Welded Service
Therefore, most joints enter service as welded, and interpass temperature stays the control point.
06
No Need for Tungsten
Tungsten stays out of the specification, which separates the grade from C-276 on the mill certificate.
07
Drawing Sets the Yield
No aging treatment applies here, so cold work is the only route above the annealed floor.
08
ALLOY SELECTION
Why Choose Alloy 59
Start with the media, because that is where this grade separates itself. Therefore, where the process alternates between oxidising and reducing steps, the chromium and molybdenum balance covers both. If the duty sits in one family only, a narrower grade costs less.
01
Low Iron Matrix
Iron at 1.5% maximum holds the passive film steady in contaminated acids and chlorinated brine.
02
Two Duties at Once
Chromium at 22 to 24% and molybdenum at 15 to 16.5% cover oxidising and reducing media together.
03
Broad Form Coverage
Nine ASTM documents reach bar, flat product, tube, pipe, forgings, and fittings.
04
Welded Fabrication
Low carbon and silicon keep the weld zone stable, which removes a furnace cycle for most joints.
PRODUCT FORMS
Available Product Forms
Each route names its own ASTM document, so start the enquiry with the form. Consequently, the size follows once that document is fixed.
02
Alloy 59 Pipe and Tube
Seamless tube to B622, plus welded pipe to B619 and welded tube to B626.
View Alloy 59 Pipe and Tube →
03
Alloy 59 Plate and Sheet
Flat product to ASTM B575, from 4.76 mm plate down through light sheet and strip.
View Alloy 59 Plate and Sheet →
APPLICATIONS
Engineered For Demanding Industries
Plant that meets more than one acid family is where the grade earns its place. In addition, chloride-bearing streams benefit most from the pitting margin.
Discuss Your Application →
01
Flue Gas Desulphurisation
Absorber walls, quench sections, and mist eliminator hardware in wet scrubbers.
02
Sulphuric Acid Coolers
Exchanger tube and shell parts in hot concentrated acid duty.
03
Nitric and Phosphoric Acid Plant
Reactors and transfer lines where the stream turns oxidising.
04
Sour Gas Handling
Equipment qualified to NACE MR0175 for oil and gas service.
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Waste Incineration
Off-gas ducting and quench hardware exposed to acid condensate.
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Seawater and Brine Systems
Pump bodies and exchangers in chlorinated seawater and concentrated brine.
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Bleach Plant and Digester Parts
Pulp mill hardware that meets chlorine dioxide.
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Pharmaceutical Reactors
Vessels and piping that survive alternating acid and alkali cleaning cycles.
TECHNICAL INFORMATION
Technical Specifications
Detailed technical information including chemical composition, mechanical properties, standards and available dimensions.
Chemical Composition
The limits below come from ASTM B574, B575, and B564, which share one composition table for UNS N06059. Iron and silicon are the deliberate restraints behind the grade, and aluminium is the small deliberate addition. The mill certificate governs final acceptance.
| Element | Content |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 22.0–24.0% |
| Molybdenum (Mo) | 15.0–16.5% |
| Iron (Fe) | 1.5% max. |
| Aluminum (Al) | 0.10–0.40% |
| Copper (Cu) | 0.50% max. |
| Manganese (Mn) | 0.50% max. |
| Cobalt (Co) | 0.30% max. |
| Silicon (Si) | 0.10% max. |
| Phosphorus (P) | 0.015% max. |
| Sulfur (S) | 0.010% max. |
| Carbon (C) | 0.010% max. |
Mechanical Properties
The five product documents set one annealed condition across every form, so the table below repeats one row set rather than splitting the grades. A separate European data sheet applies higher yield floors, and that regime is not the same as the ASTM one.
| Product Form | Condition | Tensile Strength | Yield Strength, 0.2% Offset | Elongation | Hardness |
|---|---|---|---|---|---|
| Bar and rod, ASTM B574 | Solution annealed | ≥100 ksi (690 MPa) | ≥45 ksi (310 MPa) | 45% | 100 HRB max. |
| Plate, sheet, and strip, ASTM B575 | Solution annealed | ≥100 ksi (690 MPa) | ≥45 ksi (310 MPa) | 45% | 100 HRB max. |
| Seamless tube, ASTM B622 | Solution annealed | ≥100 ksi (690 MPa) | ≥45 ksi (310 MPa) | 45% | 100 HRB max. |
| Welded pipe, ASTM B619 | Solution annealed | ≥100 ksi (690 MPa) | ≥45 ksi (310 MPa) | 45% | 100 HRB max. |
| Welded tube, ASTM B626 | Solution annealed | ≥100 ksi (690 MPa) | ≥45 ksi (310 MPa) | 45% | 100 HRB max. |
The hardness figures are informative only, and the standards bar their use as a basis for rejection. The grade is not age hardenable, so cold work is the only route above those floors. In addition, bar above roughly 100 mm may be agreed at reduced minimum values, so state the ruling section on the enquiry.
Physical Properties
Values below are typical figures for design work rather than acceptance criteria. Moreover, the alloy stays essentially non-magnetic, which suits instrument assemblies in acid duty.
| Property | Value |
|---|---|
| Density | Approx. 8.6 g/cm³ |
| Melting range | Approx. 1310–1360 °C |
| Modulus of elasticity | Approx. 210 GPa |
| Thermal conductivity at 20 °C | Approx. 10.4 W/m·K |
| Electrical resistivity at 20 °C | Approx. 1.26 µΩ·m |
| Specific heat at 20 °C | Approx. 414 J/kg·K |
| Thermal expansion, 20–100 °C | Approx. 11.9 µm/m·K |
| Relative magnetic permeability at 20 °C | 1.001 max. |
| Strengthening route | Cold work only |
Standards
Nine ASTM documents divide the forms, and the ASME editions take over under pressure-code jurisdiction. Specifically, no SAE aerospace specification reaches UNS N06059. Meanwhile, the European and Chinese designations below serve cross-reference only.
| Standard | Product or Application |
|---|---|
| ASTM B574 / ASME SB574 | Bar, rod, and wire |
| ASTM B575 / ASME SB575 | Plate, sheet, and strip |
| ASTM B622 / ASME SB622 | Seamless pipe and tube |
| ASTM B619 / ASME SB619 | Welded pipe |
| ASTM B626 / ASME SB626 | Welded tube and heat-exchanger tube |
| ASTM B564 / ASME SB564 | Forgings and forging stock |
| ASTM B366 / ASME SB366 | Factory-made wrought fittings |
| ASTM B462 / ASME SB462 | Forged or rolled flanges and forged fittings |
| ASTM B472 | Forging billets and bars for reforging |
| VdTÜV 505 | German pressure-equipment approval |
| DIN 17750 / 17752 / 17744 / 17754 | Flat product, bar, strip and wire, forgings |
| NACE MR0175 / ISO 15156-3 | Sour service qualification for oil and gas |
| API 5LD | Welded strip for line pipe |
| UNS N06059 | Unified Numbering System designation |
| W.Nr. 2.4605 / NiCr23Mo16Al | European designation |
| GB/T 15007 NS3311 | Chinese designation |
| SAE AMS | No aerospace specification covers this grade |
Nicrofer 5923 hMo is a trademark of VDM Metals, and Inconel and Incoloy are trademarks of Special Metals Corporation. We list these names for cross-reference only, and our product ships to the ASTM and ASME documents above.
The product documents come from ASTM International, and their text settles any acceptance question.
Dimensions
As a result, the ranges below follow the scope each standard defines, and oversize bar moves to the forging document. For that reason, give the form and the ordered size on the enquiry.
| Product Form | Typical Supply Range |
|---|---|
| Bar and rod | 6–300 mm diameter to ASTM B574 |
| Forged bar and forging stock | Sections above the agreed bar range, supplied to ASTM B564 |
| Seamless tube | Outside diameter 6–219 mm to ASTM B622 |
| Welded pipe | Schedule 5S to XXS to ASTM B619, with heavy wall by agreement |
| Welded tube | Outside diameter 3.2–88.9 mm to ASTM B626 |
| Plate | 4.76–63.5 mm thick to ASTM B575 |
| Sheet | Under 4.76 mm thick, from 600 mm wide |
| Strip | Under 4.76 mm thick, under 600 mm wide |
Surface Finishes
Finish follows the next operation rather than a catalog default. In short, we agree it with the order so the surface suits the fabrication you have planned.
| Surface Condition | Typical Use |
|---|---|
| Solution annealed and pickled | Standard delivery for acid and chloride service |
| Hot-worked | As-rolled or as-forged surface for parts that will be machined |
| Cold drawn | Close diameter control with a brighter surface |
| Peeled | Uniform diameter with a machined skin for further turning |
| Centerless ground | Tight diameter and straightness for shafting |
| Polished | Reduced roughness for product-contact and visible parts |
| Bright annealed | Scale-free surface for instrument and clean circuits |
TECHNICAL DOCUMENTATION
Download Technical Datasheet
Get detailed information including specifications, standards, dimensions and material properties.
FAQ
Frequently Asked Questions
Which ASTM specifications cover Alloy 59?
B574 for bar and rod, B575 for plate, sheet, and strip, and B622 for seamless tube. Welded pipe and tube follow B619 and B626.
Is there an AMS specification for Alloy 59?
No. The SAE aerospace series stops short of UNS N06059.
How does Alloy 59 differ from C-276?
Iron holds at 1.5% maximum instead of 7%, and silicon at 0.10% maximum. That purity raises the pitting resistance equivalent sharply.
Why does the grade need a water quench?
Silicon sits so low that secondary phases form faster if the section cools slowly. For that reason, we quench every heat straight from the anneal.
Can Alloy 59 run as welded?
Usually yes. Nevertheless, wall thickness above 25 mm may call for a short solution anneal after welding.
How high can Alloy 59 run in continuous service?
Roughly from −196 to +450 °C under ASME pressure-vessel rules. Above that ceiling, verify the duty before ordering.
What is your MOQ for Alloy 59?
One piece covers most stock sizes.
What are your trade terms for Alloy 59?
We quote mainly on FOB terms, and EXW or CIF follow on request.
What is the lead time for Alloy 59?
Stock sizes ship in 7-15 days, and made-to-order material runs about 25 days.
Do you provide EN 10204 3.1 and 3.2 certificates?
Yes. Every heat ships with an EN 10204 3.1 certificate, and we arrange 3.2 endorsement on request.
REQUEST FOR QUOTATION
Need A Custom Alloy Solution?
Send the form, the ordered size, and the acid duty. Our engineers reply with price, lead time, and the document set together. Because the cooling practice changes what we can certify on a heavy section, tell us the ruling thickness.
A trial quantity costs little, so one bar or a single plate proves the grade before a plant-wide order.
