Seamless rolled rings
Ring-rolled with no weld seam. Rectangular or profiled section, single or stacked.
Nickel Alloy · UNS N06059 · W.Nr. 2.4605
UNS N06059 Forgings
Seamless rolled rings, flanges, round bars, discs, shafts, sleeves, bushings and tube sheets, open-die forged in Alloy 59 to ASTM B564 / ASME SB-564.
UNS N06059
W.Nr. 2.4605
EN NiCr23Mo16Al
Common Alloy 59
Forging spec ASTM B564
UNS N06059 is a nickel-chromium-molybdenum alloy containing 22–24% chromium, 15–16.5% molybdenum and 0.1–0.4% aluminium, with a nickel balance of about 59%, carbon held to 0.010% maximum and silicon to 0.10% maximum. It is also written Alloy 59, W.Nr. 2.4605 and NiCr23Mo16Al. The calculated PREN of about 75 is the highest of the commercial Ni-Cr-Mo alloys. Extra-low carbon and silicon keep the alloy from sensitising during welding and hot forming. Both properties matter in flue gas desulphurisation, hot contaminated mineral acids and chloride-bearing process streams. Those are the duties where Hastelloy C-276 and Inconel 625 start to lose ground.
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu Province, China. It forges UNS N06059 to customer drawings: seamless rolled rings, flanges, round bars, discs, shafts, sleeves, bushings, tube sheets and valve components. Parts are supplied solution annealed, ultrasonically tested and certified to EN 10204 3.1 or 3.2. For a quotation, contact sales@steelforgepieces.com or +86 189 2135 9659.
≈75PREN (Cr + 3.3 Mo). Highest of the commercial Ni-Cr-Mo alloys
0.010%Maximum carbon. Extra-low C and Si prevent grain-boundary precipitation
690 MPaMinimum tensile strength per ASTM B564, solution annealed
Ø3,000 mmLargest seamless rolled ring we forge in this grade
UNS N06059 at a glance
- Grade
- UNS N06059. Also written Alloy 59, NiCr23Mo16Al, Nicrofer® 5923 hMo
- UNS number
- N06059
- Werkstoff / EN
- 2.4605 / NiCr23Mo16Al
- Alloy family
- Nickel-chromium-molybdenum, solid solution, face-centred cubic
- Nominal chemistry
- Ni bal. (≈59%) · Cr 23% · Mo 16% · Al 0.25% · C ≤0.010% · Si ≤0.10%
- Forging standard
- ASTM B564 / ASME SB-564
- Delivery condition
- Solution annealed 1100–1180 °C, rapidly cooled, pickled
- Hardening
- None. Solid-solution alloy, never age hardened
- PREN (Cr + 3.3 Mo)
- ≈75 (range 71–78 across the composition window)
- Density
- 8.6 g/cm³ (0.311 lb/in³)
- Melting range
- 1310–1360 °C (2390–2480 °F)
- Sour service
- NACE MR0175 / ISO 15156 and API 6ACRA
- Certification
- EN 10204 3.1 standard, 3.2 third-party witnessed on request
- Forged by
- Jiangyin Jiangnan Metal Co., Ltd., Jiangyin, Jiangsu, China
What UNS N06059 is, and when to specify it
Specify UNS N06059 when the service is oxidising, or alternates between oxidising and reducing, and contains chlorides. Typical cases are flue gas desulphurisation, contaminated sulphuric acid and waste incineration scrubbers. Specify Hastelloy C-276 instead when the duty is consistently reducing, such as mid-concentration hydrochloric acid at temperature.
Alloy 59 was developed by VDM Metals as a refinement of the C-family Ni-Cr-Mo alloys, aimed at flue gas desulphurisation service. Three composition choices define it. Chromium is raised to 22–24%, well above the 14.5–16.5% of Hastelloy C-276, and it carries the alloy under oxidising conditions and against chloride pitting. Molybdenum stays at 15–16.5%, the same level as C-276, so reducing-acid resistance is not traded away to gain that chromium. Carbon and silicon are cut to 0.010% and 0.10% maximum, roughly a third of what the earlier grades allowed.
The third control has more effect than the number suggests. Carbon and silicon drive carbide and intermetallic precipitation at grain boundaries during welding and hot forming. Holding both this low stops UNS N06059 sensitising, so a weld heat-affected zone corrodes at close to the parent metal rate and no post-weld solution anneal is required in normal practice. On a forged and welded pressure component that takes out a whole failure mode.
The alloy contains no tungsten and no niobium. It is a single-phase solid-solution material with a face-centred cubic structure. Heat treatment cannot harden it. Strength comes from the alloying elements held in solution and from the forged grain structure. Ageing will only precipitate the phases that the low carbon content was set up to avoid.
Chemical composition of UNS N06059
Composition limits below are the UNS N06059 window used in ASTM B564 / ASME SB-564 and VdTÜV Werkstoffblatt 505, expressed in weight percent. The three highlighted rows are the controls that separate this grade from the older C-family alloys.
| Element | Min % | Max % | Role in the alloy |
|---|---|---|---|
| Nickel (Ni) | balance ≈59 | — | Base element. Carries resistance to chloride stress-corrosion cracking |
| Chromium (Cr) | 22.0 | 24.0 | The defining addition. Drives oxidising-acid and pitting resistance well beyond C-276 |
| Molybdenum (Mo) | 15.0 | 16.5 | Resistance under reducing conditions and to crevice attack |
| Aluminium (Al) | 0.10 | 0.40 | Deoxidiser; contributes to the thermal stability of the structure |
| Iron (Fe) | — | 1.5 | Residual limit. Kept low to protect corrosion performance |
| Carbon (C) | — | 0.010 | Extra-low. Prevents grain-boundary carbide precipitation during welding |
| Silicon (Si) | — | 0.10 | Extra-low. Suppresses intermetallic phase formation in the heat-affected zone |
| Manganese (Mn) | — | 0.50 | Deoxidiser; combines with residual sulfur |
| Cobalt (Co) | — | 0.30 | Residual limit. Restricted for nuclear and radiological service |
| Copper (Cu) | — | 0.50 | Residual limit |
| Phosphorus (P) | — | 0.015 | Kept low for hot workability |
| Sulfur (S) | — | 0.010 | Kept low for hot workability and toughness |
Table compiled by Jiangyin Jiangnan Metal Co., Ltd. from ASTM B564 and VdTÜV Werkstoffblatt 505. This is the specification range we forge to; every heat is supplied with a ladle analysis on the mill certificate, and product analysis can be added on request.
Pitting resistance equivalent number
PREN is calculated as Cr + 3.3 × Mo for tungsten-free alloys. At the midpoint of the UNS N06059 window that gives 23 + 3.3 × 15.75 = PREN ≈ 75. Across the full composition range the value falls between 71 and 78. For comparison, 316L stainless steel sits near 25 and super duplex near 42. That gap is the practical reason N06059 is used on duties where duplex and 6% Mo austenitics pit.
Ordering note. Cobalt is limited to 0.30% by the specification. If your application is nuclear or involves radiological survey, state a tighter cobalt cap on the enquiry. We can source heats to 0.10% Co maximum, but it has to be agreed before melting rather than after.
Mechanical properties of UNS N06059 forgings
Specified minimums to ASTM B564 / ASME SB-564, solution annealed
These are the values a mill certificate must meet for UNS N06059 forgings. They are minimums rather than typical values, and acceptance is judged against them.
| Property | Metric | Imperial |
|---|---|---|
| Tensile strength, min | 690 MPa | 100 ksi |
| Yield strength 0.2% offset, min | 310 MPa | 45 ksi |
| Elongation in 50 mm (2 in) or 4D, min | 45 % | 45 % |
Source: ASTM B564 / ASME SB-564, UNS N06059, solution annealed condition.
Typical as-delivered values
Solution-annealed UNS N06059 forgings usually test well above the specified minimums. The ranges below are representative of our production and vary with section size and cooling rate.
| Property | Typical (metric) | Typical (imperial) |
|---|---|---|
| Tensile strength | 720–800 MPa | 104–116 ksi |
| Yield strength 0.2% | 340–420 MPa | 49–61 ksi |
| Elongation | 50–65 % | 50–65 % |
| Reduction of area | 55–75 % | 55–75 % |
| Hardness | 85–100 HRB | ≈170–210 HB |
| Impact energy, Charpy V, −196 °C | ≥160 J | ≥118 ft·lb |
Typical values are for design screening only. The mill test certificate issued with each forging governs acceptance. Sour-service orders to NACE MR0175 / ISO 15156 are supplied solution annealed with hardness reported on the certificate.
Physical properties of UNS N06059
| Property | Metric | Imperial |
|---|---|---|
| Density | 8.6 g/cm³ | 0.311 lb/in³ |
| Melting range | 1310–1360 °C | 2390–2480 °F |
| Crystal structure | face-centred cubic | FCC, single phase |
| Modulus of elasticity, 20 °C | ≈210 GPa | ≈30.5 × 10⁶ psi |
| Specific heat, 20 °C | ≈410 J/kg·K | ≈0.098 Btu/lb·°F |
| Thermal conductivity, 20 °C | ≈10.4 W/m·K | ≈72 Btu·in/ft²·h·°F |
| Mean thermal expansion, 20–100 °C | ≈12.4 µm/m·K | ≈6.9 × 10⁻⁶ in/in·°F |
| Electrical resistivity, 20 °C | ≈1.25 µΩ·m | ≈752 Ω·circ mil/ft |
| Magnetic permeability | ≈1.001 | non-magnetic |
Nominal values compiled from published Alloy 59 literature for guidance in design calculation. Values marked ≈ vary slightly between producers and are not certified properties.
Corrosion behaviour of UNS N06059
UNS N06059 exists because it does not force a choice between oxidising and reducing resistance. Chromium at 23% covers the oxidising side and molybdenum at 16% covers the reducing side, with neither traded away for the other.
Most corrosion-resistant alloys are optimised for one regime. Raise chromium for oxidising acids and molybdenum usually comes down, which costs performance in reducing acids. Hastelloy C-276 sits at the reducing end with 15.5% Cr. Inconel 625 sits in the middle with only 9% Mo. UNS N06059 carries C-276 level molybdenum together with chromium above Inconel 625, so it performs across mixed and cycling conditions instead of inside one window.
Where the alloy performs
- Oxidising and reducing mineral acids. Sulphuric, phosphoric, nitric and hydrochloric acid, including contaminated grades. Published corrosion rates in boiling 10% sulphuric acid are under a third of those measured on other introduced Ni-Cr-Mo alloys.
- Sulphuric/hydrochloric acid mixtures. The condition that defeats most alternatives, and the one Alloy 59 was developed for.
- Chloride pitting and crevice corrosion. A PREN near 75 puts critical pitting and crevice temperatures above those of 6% Mo austenitics and super duplex by a wide margin.
- Chloride stress-corrosion cracking. The 59% nickel base gives effective immunity in the concentrations found in process plant.
- Sensitisation resistance. Extra-low carbon and silicon mean welded and hot-formed material retains parent-metal corrosion resistance without a post-weld anneal.
- Sour service. Qualified under NACE MR0175 / ISO 15156 and API 6ACRA for H₂S-bearing oil and gas production.
Surface condition governs performance. The published corrosion data for Alloy 59 assumes clean, metallically bright material. Forge scale, embedded grinding grit, iron pickup from carbon-steel tooling and heat tint all create initiation sites. We pickle and passivate UNS N06059 forgings as standard and handle them on dedicated stainless tooling. If your specification calls for a particular final surface, state it on the enquiry: pickled, ground, shot blasted with stainless media, or machined all over.
Heat treatment and hot working
| Operation | Temperature | Practice |
|---|---|---|
| Hot forging | 1180–950 °C | Finish above 950 °C. Reheat rather than forge cold, since the alloy work-hardens rapidly |
| Solution annealing | 1100–1180 °C | Redissolves secondary phases and restores full corrosion resistance |
| Cooling from anneal | >150 °C/min to 500 °C | Water quench for heavy sections. Slow cooling re-precipitates the phases the anneal removed |
| Re-anneal after cold work | 1100–1180 °C | Mandatory when cold deformation exceeds 15% |
| Age hardening | not applicable | UNS N06059 is a solid-solution alloy. It is never aged |
Welding
UNS N06059 is welded by GTAW, GMAW, SMAW and plasma processes and is grouped as P-No. 43 under ASME Section IX. Low heat input and interpass temperature below 150 °C are the normal controls. The matching filler is ERNiCrMo-13 / S Ni 6059 (NiCr23Mo16). The alloy resists sensitisation, so weldments keep parent-metal corrosion resistance and post-weld heat treatment is not required unless the design code calls for it. Alloy 59 filler is also specified for welding other Ni-Cr-Mo alloys and for overlay cladding on carbon steel, since a weld deposit lands between the parent chemistries and Alloy 59 has margin to spare.
UNS N06059 vs C-276, C-22, C-2000 and Inconel 625
These five alloys compete for the same enquiries and are frequently substituted for one another on drawings. They differ mainly in chromium, molybdenum and tungsten. The table gives the composition drivers and the resulting PREN, calculated on a consistent Cr + 3.3 Mo + 1.65 W basis.
| Criterion | Alloy 59 N06059 |
Hastelloy C-276 N10276 |
Hastelloy C-22 N06022 |
Hastelloy C-2000 N06200 |
Inconel 625 N06625 |
|---|---|---|---|---|---|
| Chromium, % | 22–24 | 14.5–16.5 | 20–22.5 | 22–24 | 20–23 |
| Molybdenum, % | 15–16.5 | 15–17 | 12.5–14.5 | 15–17 | 8–10 |
| Tungsten, % | — | 3–4.5 | 2.5–3.5 | — | — |
| Other | Al 0.1–0.4 | — | — | Cu 1.3–1.9 | Nb 3.15–4.15 |
| Carbon, max % | 0.010 | 0.010 | 0.015 | 0.010 | 0.10 |
| PREN, calculated | ≈75 | ≈74 | ≈70 | ≈76 | ≈51 |
| Oxidising media | Excellent | Moderate | Very good | Excellent | Good |
| Reducing media | Excellent | Excellent | Good | Excellent | Moderate |
| Tensile min, forgings | 690 MPa | 690 MPa | 690 MPa | 690 MPa | 760–830 MPa |
| Choose it when | Mixed or cycling oxidising/reducing service with chlorides; FGD | Consistently reducing service, mid-concentration HCl | A proven general-purpose C-grade is acceptable | Sulphuric acid service where copper helps | Strength and high-temperature service matter more than acid resistance |
Selection rule. For flue gas desulphurisation, and for any duty that cycles between oxidising and reducing while carrying chlorides, UNS N06059 is usually the correct specification. For steady reducing service in hydrochloric acid, C-276 stays competitive. Inconel 625 belongs in a different category: it is chosen for strength and high-temperature service, and its corrosion resistance is secondary.
UNS N06059 equivalent designations
| System | Designation |
|---|---|
| UNS (USA) | N06059 |
| Werkstoff Nr. (Germany) | 2.4605 |
| EN / DIN chemical name | NiCr23Mo16Al |
| Generic industry name | Alloy 59 |
| ISO 15156 / NACE | Listed as N06059 |
| Welding filler | ERNiCrMo-13 / S Ni 6059 / NiCr23Mo16 |
| Trade names | Nicrofer® 5923 hMo (VDM Metals), VDM® Alloy 59, Haynes® 59 |
A common ordering error: UNS N06059 is not the same as UNS N08031 (Alloy 31). Several online sources list Alloy 59 under N08031, which is a different material. Order to the UNS number together with ASTM B564 and confirm the equivalence against the mill certificate before release. Nicrofer and VDM are registered trademarks of VDM Metals GmbH; Haynes and Hastelloy of Haynes International, Inc.; Inconel of Special Metals Corporation. Jiangyin Jiangnan Metal Co., Ltd. is not affiliated with these trademark holders, and the names are used here only to identify equivalent material specifications. Material we produce is correctly described as UNS N06059 / W.Nr. 2.4605 / ASTM B564.
Standards covering UNS N06059
| Product form | ASTM | ASME |
|---|---|---|
| Forgings (our core product) | B564 | SB-564 |
| Rod, bar and wire | B574 | SB-574 |
| Plate, sheet and strip | B575 | SB-575 |
| Seamless pipe and tube | B622 | SB-622 |
| Welded pipe | B619 | SB-619 |
| Welded tube | B626 | SB-626 |
| Fittings | B366 | SB-366 |
| Fasteners | F467 / F468 | — |
Other governing documents
- DIN 17744, 17750, 17751, 17752. German coverage for wrought nickel alloy product forms.
- VdTÜV Werkstoffblatt 505. The German pressure-equipment approval document for Alloy 59, and the source of the composition window most European buyers order against.
- NACE MR0175 / ISO 15156. Sour service qualification for H₂S-bearing oil and gas production.
- API 6ACRA. Corrosion-resistant alloys for wellhead and Christmas tree equipment.
- ASME Section IX. Welding qualification, P-No. 43.
- BAM listing. The alloy appears on the German Federal Institute for Materials Research and Testing list of materials accepted for the transport of hazardous goods.
- EN 10204. Certification type. 3.1 as standard, 3.2 third-party witnessed on request.
UNS N06059 forgings we produce
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory. Every item below is forged to the customer's drawing or dimensional sketch. There is no fixed catalogue, no tooling charge and no piece minimum on open-die work. That is what makes one-off and prototype quantities economic in an alloy at this price.
Forged flanges
WN, SO, blind, long weld neck, orifice and lap joint, to ASME B16.5 / B16.47 or drawing.
Round bars & billets
Forged and peeled or rough turned, cut to length, for machined valve and pump parts.
Discs and blanks
Upset forged discs for tube sheets, covers, blind ends and rupture-disc holders.
Shafts and spindles
Straight, stepped and eccentric shafts for agitators, pumps and FGD ventilators.
Sleeves and bushings
Hollow forged, trepanned or bored, thin or heavy wall, for pump and mixer service.
Tube sheets
Forged and drilled tube sheets for shell-and-tube heat exchangers and acid coolers.
Hollow bars & forged pipe
Trepanned or expanded hollows for heavy-wall pipe sections and nozzle necks.
Valve components
Bodies, bonnets, seat rings, stems, gate and plug blanks for corrosive service valves.
Nozzles and manifolds
Forged nozzle bodies, headers, blocks, scrubber spray lances and custom shapes.
Size and weight capability in UNS N06059
| Product form | Dimensional range | Unit weight |
|---|---|---|
| Seamless rolled rings | OD 200–3,000 mm, height to 800 mm | 20–8,000 kg |
| Round bars | Ø80–800 mm, length to 6,000 mm | 20–6,000 kg |
| Discs and tube sheets | Ø200–2,500 mm, thickness to 600 mm | 30–10,000 kg |
| Shafts, sleeves, blocks | to 6,000 mm long | to 10,000 kg |
Machining allowance is normally 6–20 mm per surface depending on section size, unless your drawing states otherwise. Finish-machined parts to print are also supplied. UNS N06059 raw material is costly, so we quote near-net forged shapes wherever the geometry allows. The saving on material is usually larger than the cost of the extra forging operations.
How we make UNS N06059 forgings
- MeltingUNS N06059 stock is melted by EAF + AOD/VOD followed by ESR remelting. Double melting is standard practice for this grade rather than an upgrade. Carbon must be held under 0.010% and silicon under 0.10%, and neither figure is reliable from a single melt.
- Billet verificationHeat chemistry is verified by optical emission spectrometer against the ASTM B564 limits for N06059, including the low carbon and silicon caps, before any material is heated.
- Open-die forgingForged between 1180 and 950 °C on hydraulic presses with controlled reduction ratio, closing porosity and developing a wrought grain flow that follows the part contour. Rings are ring-rolled seamless. The alloy work-hardens quickly, so we reheat rather than push the finishing temperature down.
- Solution annealingHeld at 1100–1180 °C, then quenched at more than 150 °C/min down to 500 °C. This step delivers the corrosion resistance the alloy is bought for. A forging that is correctly made and then slowly cooled will still pass a tensile test and still fail in service.
- Rough or finish machiningTurned, bored, drilled and faced to your drawing, with agreed machining allowance or to final dimensions. Machined on tooling segregated from carbon steel work to avoid iron pickup.
- Non-destructive testingUltrasonic examination to EN 10228-3, SEP 1921, ASTM A388 or your nominated class. Liquid penetrant and dimensional inspection as required.
- Pickling, certification and despatchPickled and passivated to a clean metallic surface, then certified to EN 10204 3.1 as standard or 3.2 with third-party witness. Marked, preserved and packed for sea or air freight.
Where UNS N06059 forgings are used
| Industry | Components forged in UNS N06059 |
|---|---|
| Flue gas desulphurisation | Absorber and scrubber internals, quencher nozzles, spray lance headers, ventilator and agitator shafts, ducting flanges and expansion joint rings. This is the application the alloy was developed for |
| Chemical processing | Acetic acid and acetic anhydride reactor components, hydrofluoric acid service parts, sulphuric acid cooler tube sheets, agitator shafts, forged nozzles and manways |
| Waste incineration | Wet scrubber hardware, condensate-duty flanges and rings, quench section components below the acid dew point |
| Oil & gas, sour service | Wellhead and Christmas tree bodies, valve blocks, seat rings and stems, subsea connector rings, qualified to NACE MR0175 / ISO 15156 and API 6ACRA |
| Marine | SOx scrubber components for ship diesel exhaust gas cleaning systems, seawater-side pump and valve parts |
| Power generation | Geothermal plant tube sheets and flanges, FGD retrofit hardware, condensate-duty valve bodies |
| Pulp, paper and pharmaceutical | Bleach plant washers and agitator shafts, chlorine dioxide service hardware, reactor and crystalliser components |
| Pressure vessels & heat exchangers | Forged tube sheets, shell flanges, blind covers, girth rings and nozzle forgings for corrosive-duty exchangers |
These duties share one feature. The medium is aggressive and it changes character during operation. FGD condensate swings between oxidising and reducing while carrying chlorides and fluorides at low pH, and waste incineration scrubbers behave the same way. A material that performs well in one regime and poorly in the other will eventually meet the regime it dislikes. UNS N06059 takes that variable out of the selection.
Testing, inspection and certification
- Chemical analysis. Spectrometric heat analysis and, on request, product analysis on the finished forging.
- Mechanical testing. Room-temperature tensile, yield and elongation per ASTM B564. Elevated-temperature tensile, impact and hardness testing to your specification.
- Corrosion testing. ASTM G28 Method A or B, ASTM A262 practice, and critical pitting or crevice temperature determination per ASTM G48 where the order calls for it.
- Ultrasonic testing. EN 10228-3, SEP 1921 Class C/D/E, ASTM A388 or customer class.
- Surface NDT. Liquid penetrant examination per ASTM E165 / ASME V Article 6. Magnetic particle inspection does not apply, since the alloy is non-magnetic.
- Grain size and microstructure. ASTM E112 determination and metallographic examination for secondary phase, which is the check that the anneal and quench were done correctly.
- PMI. Positive material identification by portable XRF or OES before despatch, on request.
- Certification. EN 10204 3.1 as standard; EN 10204 3.2 witnessed by TÜV, BV, LR, SGS or DNV on request. Full heat traceability and hard stamping.
Recommended addition to the order. For Alloy 59, an ASTM G28 Method A test checks whether the forging was correctly solution annealed and quenched far better than any tensile result does. If the part is going into acid service, ask for it.
Frequently asked questions about UNS N06059
What is UNS N06059?
UNS N06059 is a nickel-chromium-molybdenum alloy containing 22–24% chromium, 15–16.5% molybdenum, 0.1–0.4% aluminium and a nickel balance of about 59%, with carbon held to 0.010% maximum and silicon to 0.10% maximum. It is also known as Alloy 59, W.Nr. 2.4605 and NiCr23Mo16Al. The calculated PREN of about 75 is the highest of the commercial Ni-Cr-Mo alloys. The grade is specified for flue gas desulphurisation, hot contaminated mineral acids and chloride-bearing process streams. Forgings are supplied to ASTM B564 / ASME SB-564 in the solution annealed condition.
Is UNS N06059 the same as Alloy 59?
Yes. UNS N06059, Alloy 59, W.Nr. 2.4605, NiCr23Mo16Al and the trade name Nicrofer® 5923 hMo all describe the same material. UNS N06059 is the North American unified numbering designation, 2.4605 is the German Werkstoff number, and Alloy 59 is the generic industry name used by producers other than the originator. When ordering, specify UNS N06059 together with ASTM B564 so the requirement is unambiguous. Some online sources list Alloy 59 as UNS N08031. That is Alloy 31, a different material.
What is the difference between UNS N06059 and Hastelloy C-276?
UNS N06059 carries 22–24% chromium against 14.5–16.5% for C-276 (UNS N10276), and contains no tungsten. The higher chromium gives N06059 clearly better performance under oxidising conditions, in nitric and hot sulphuric acid, and against chloride pitting. Molybdenum is the same in both grades, so nothing is given up on the reducing side to gain that chromium. C-276 retains an advantage in strongly reducing media such as mid-concentration hydrochloric acid at temperature, where its tungsten helps. For mixed or cycling oxidising and reducing service, and for flue gas desulphurisation, N06059 is usually the better specification.
What heat treatment is correct for UNS N06059 forgings?
Solution annealing between 1100 and 1180 °C, followed by rapid cooling. For full corrosion resistance the cooling rate through the critical range should exceed 150 °C per minute down to 500 °C, normally by water quench. UNS N06059 is a solid-solution alloy and is never age hardened. Ageing would precipitate the phases that the extra-low carbon content was set up to prevent. Hot working is carried out between 1180 and 950 °C, and any part cold formed by more than 15% must be re-solution annealed.
Can UNS N06059 be welded?
Yes. It is welded by GTAW, GMAW, SMAW and plasma processes and is grouped as P-No. 43 under ASME Section IX. The extra-low carbon and silicon content makes it very resistant to hot cracking and to sensitisation, so weldments hold the same corrosion resistance as the parent metal and post-weld heat treatment is not required in normal practice. The matching filler is ERNiCrMo-13 / S Ni 6059. Alloy 59 filler is also used to weld other Ni-Cr-Mo alloys and to overlay carbon steel, because its composition gives margin over most parent chemistries.
Which standards cover UNS N06059 forgings?
Forgings are covered by ASTM B564 and ASME SB-564. Related product forms fall under ASTM B574 / SB-574 for rod and bar, B575 / SB-575 for plate, sheet and strip, B622 / SB-622 for seamless pipe and tube, and B366 / SB-366 for fittings. German coverage is DIN 17744, 17750, 17751 and 17752 with VdTÜV Werkstoffblatt 505. Sour service is covered by NACE MR0175 / ISO 15156 and API 6ACRA. The alloy is also on the German BAM list of materials accepted for the transport of hazardous goods.
What sizes of UNS N06059 forgings can you supply?
Jiangyin Jiangnan Metal Co., Ltd. produces UNS N06059 seamless rolled rings from 200 to 3,000 mm outside diameter, round bars from 80 to 800 mm diameter, discs and tube sheets to 2,500 mm diameter, and shafts and sleeves to 6,000 mm long, with single-piece weights up to 10,000 kg. All work is open die and made to the customer drawing, so there is no tooling charge and no minimum piece quantity. Send a drawing or a dimensional sketch for a firm quotation.
What certification is supplied with UNS N06059 forgings?
Every UNS N06059 forging ships with an EN 10204 3.1 mill test certificate as standard, showing heat number, chemical analysis, mechanical test results, heat treatment record and NDT results. EN 10204 3.2 certification witnessed by a third party such as TÜV, BV, LR, SGS or DNV is available on request at the time of order. Ultrasonic testing is performed to EN 10228-3, SEP 1921 or ASTM A388 as specified. ASTM G28 corrosion testing and PMI can be added.
Where is UNS N06059 used?
The largest single application is flue gas desulphurisation in coal-fired power stations and waste incinerators, where scrubbers, absorbers, quenchers and ducting see chloride-bearing condensate below the acid dew point. Other uses include acetic acid and acetic anhydride plant, hydrofluoric acid service, sulphuric acid coolers, marine diesel SOx scrubbers, geothermal power plant, pulp bleaching, and sour oil and gas hardware qualified to NACE MR0175 / ISO 15156.
How long does a UNS N06059 forging take to produce?
Lead time depends on whether the grade is in raw stock and on the size of the forging. Simple rings and discs from stock material typically run 30–45 days. Parts needing a new ESR melt, heavy machining or third-party witnessed inspection take longer. UNS N06059 is not a stock-and-shelf grade at most mills, so we confirm material availability before quoting a date rather than after. Send your drawing and we will confirm a firm date with the quotation.
Who supplies open-die forged UNS N06059 parts in China?
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. It forges UNS N06059 / Alloy 59 and other nickel alloys, stainless steels, tool steels, alloy steels and carbon steels into seamless rolled rings, flanges, round bars, discs, shafts, sleeves, bushings and tube sheets, and exports worldwide. Enquiries: sales@steelforgepieces.com or +86 189 2135 9659.
Request a quotation for UNS N06059 forgings
Send a drawing, a sketch, or just the dimensions and quantity. We quote open-die forgings in UNS N06059 with no tooling charge and no piece minimum.
Useful details if you have them: grade and standard (UNS N06059 / Alloy 59 / ASTM B564), product form, dimensions with machining allowance, quantity, delivery condition, NDT class, certificate type (EN 10204 3.1 or 3.2), any corrosion test requirement, and required delivery date.
Email your drawing for a quote
- Company
- Jiangyin Jiangnan Metal Co., Ltd.
- Business
- Open-die forging factory
- Address
- No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
- Telephone / WhatsApp
- +86 189 2135 9659
- sales@steelforgepieces.com
- Website
- www.steelforgepieces.com