Alloy 59 (UNS N06059 / 2.4605): Properties & Supply
Basic Description
Sagiant Piping Industries supports enquiries for Alloy 59 (UNS N06059, Werkstoff 2.4605; also known as VDM Alloy 59 / Nicrofer 5923 hMo) as pipe, tube, buttweld and forged fittings, flanges, bars, sheet/plate and fasteners. This nickel-chromium-molybdenum alloy offers strong resistance to oxidising and reducing acids, pitting, crevice corrosion and stress-corrosion cracking — performance still depends on concentration, temperature, impurities, aeration, velocity and weld condition, and universal superiority over other Ni-Cr-Mo grades is not claimed. Material is offered by product form against current ASTM references (B622, B619/B626, B574, B575, B564, B366) and VdTÜV 505, with the exact specification and edition confirmed per order and EN 10204 3.1 or 3.2 documentation. The matching welding consumable FM 59 (ERNiCrMo-13, Werkstoff 2.4607) is a separate product from base metal 2.4605. Sagiant is an independent supplier and stockist, not the alloy producer.
Alloy 59 (N06059 / 2.4605): chemistry, properties, standards and RFQ data
Alloy 59 (N06059) composition, condition-scoped mechanical and physical reference data, standards by product form, supported dimensions and corrosion/service guidance. Producer reference values are shown separately from specification acceptance limits confirmed on the certificate; FM 59 welding consumable is a distinct product.
Technical Specification
| Parameter | Specification |
|---|---|
| Material | Alloy 59 (UNS N06059, Werkstoff 2.4605); nickel-chromium-molybdenum alloy |
| Producer designation | VDM Alloy 59 / Nicrofer 5923 hMo / NiCr23Mo16Al (trademark of the producer) |
| Product forms | Seamless & welded pipe/tube, buttweld & forged fittings, flanges, bars, sheet/plate, fasteners — by actual route |
| Supply condition | Solution annealed unless otherwise specified |
| Documentation | Heat traceability with EN 10204 3.1 or 3.2 certificates as ordered |
| Basis | Producer reference data; specification acceptance limits and edition confirmed per order |
Sagiant is an independent supplier and stockist, not the alloy producer. A branded or producer name does not mean every generic N06059 item was made by that producer.
Chemical Composition (wt %)
| Element | Mass % |
|---|---|
| Nickel, Ni | Balance |
| Chromium, Cr | 22.0–24.0 |
| Molybdenum, Mo | 15.0–16.5 |
| Iron, Fe | ≤1.5 |
| Carbon, C | ≤0.010 |
| Silicon, Si | ≤0.10 |
| Manganese, Mn | ≤0.50 |
| Cobalt, Co | ≤0.30 |
| Copper, Cu | ≤0.50 |
| Phosphorus, P | ≤0.015 |
| Sulfur, S | ≤0.010 |
| Aluminium, Al | 0.10–0.40 |
“Balance” is not a measured heat analysis, and unlisted elements are not automatically zero. Specification limits, nominal producer composition and actual heat analysis are different datasets; the certificate governs.
Alloy identity and designation cross-reference
| Record | Identity / treatment |
|---|---|
| Base material | Alloy 59 / UNS N06059 / Werkstoff 2.4605 |
| Producer cross-reference | VDM Alloy 59 / Nicrofer 5923 hMo / NiCr23Mo16Al |
| Welding consumable | FM 59 — separate record: Werkstoff 2.4607, ERNiCrMo-13 (AWS A5.14); not base-metal 2.4605 |
| AM feedstock | Powder 59 — separate additive-manufacturing route; wrought properties do not describe deposited material |
| Comparison candidates | C-22, C-276, C-2000, 686, 2120 — comparators, not equivalents or approved substitutes |
Other national aliases are added only when verified against the issuing standard.
Mechanical Properties (solution annealed)
| Property (20°C) | Reference value |
|---|---|
| 0.2% proof stress, Rp0.2 | ≥340 MPa (min basis) |
| 1.0% proof stress, Rp1.0 | ≥380 MPa |
| Tensile strength, Rm | 690–900 MPa |
| Elongation, A | ≥40% (gauge length per specification) |
| Hardness | Per specification / method where specified |
Values vary with product route, size and condition. Elevated-temperature short-term strength, impact energy (state J vs J/cm², specimen size and orientation) and design-dependent data (creep, rupture, fatigue, fracture toughness, allowable stress) are supplied only with the applicable qualified dataset, otherwise identified as unavailable rather than assumed.
Physical Properties
| Property | Value (20°C) |
|---|---|
| Density | 8.6 g/cm³ |
| Specific heat | 414 J/(kg·K) |
| Thermal conductivity | 10.4 W/(m·K) |
| Electrical resistivity | 126 µΩ·cm |
| Modulus of elasticity | 210 GPa |
| Magnetic response | Low permeability; state test condition |
| Melting range | ~1310–1360°C (interval, not a maximum operating temperature) |
Thermal, elastic and electrical properties change with temperature. A melting interval or short-term strength figure is not a maximum allowable operating temperature.
Standards by Product Form
| Product form | Material / dimensional reference |
|---|---|
| Seamless pipe & tube | ASTM B622 (distinguish pipe NPS from tube OD × wall) |
| Welded pipe | ASTM B619/B619M (class, route, heat treatment, tests specified) |
| Welded tube | ASTM B626 |
| Rod / bar | ASTM B574 |
| Sheet / plate / strip | ASTM B575 |
| Forgings / flanges | ASTM B564 (material); B16.5 dimensions/rating only with material & design verification |
| Buttweld fittings | ASTM B366/B366M (verify grade & class); B16.9 dimensional basis |
| Forged socket/threaded fittings | Material & manufacturing specification stated; dimensional standard & rating identified |
| Fasteners | Actual fastener material specification, mechanical class, thread standard & inspection (bar certification alone is insufficient) |
| Wire | Engineering wire and welding wire separated, each to its own specification |
| Pressure-code / European | VdTÜV 505 with its actual scope; EN 10216-5 (stainless pressure tubes) is not a generic nickel-alloy tube certification |
Where ASME SB specifications or sour-service standards are required, the adopted edition and acceptance conditions are stated rather than implied.
Available Forms, Sizes & Dimensions
| Form | Range / basis |
|---|---|
| Seamless pipe | To ~NPS 12; B36.10M / B36.19M (S) designations where contractually used, subject to mill confirmation |
| Welded pipe | Larger diameters by welded route, subject to mill confirmation |
| Tube | Stated as OD × wall, with nominal/minimum wall basis, lengths, ends & tolerances |
| Bar | By dimension & condition, subject to confirmation |
| Sheet / plate | By thickness & tolerance per form |
| Flanges (Class 150–1500) | Through NPS 24 (B16.5) |
| Flanges (Class 2500) | Through NPS 12 only (B16.5) |
Class is a rating designation, not pressure in psi; applicable material grouping, temperature and code conditions are established before quoting ratings. Unsupported combinations are marked “not standardized”, “not offered” or “subject to mill confirmation” rather than filled with guessed walls.
Corrosion, Temperature & Service Selection
| Factor | Consideration |
|---|---|
| Media | Hydrochloric & sulphuric acids, chlorides, FGD and mixed acids assessed individually |
| Conditions | Concentration, temperature, impurities, aeration/redox, velocity, crevices, welded condition |
| Attack modes | General corrosion, pitting, crevice attack, SCC and intergranular corrosion assessed separately |
| Evidence | Corrosion-rate data with test duration for the actual service |
| Temperature/design | Aqueous corrosion temperature, prolonged thermal exposure and pressure design treated separately; no single “max service temperature” detached from medium and stress |
Alloy 59 offers strong resistance across oxidising and reducing conditions, but universal superiority over C-22/C-276 is not claimed — composition totals alone (for example Cr+Mo, where Alloy 2120 is higher) do not rank service performance. Provide the actual process envelope in the RFQ.
Welding, Heat Treatment & Fabrication
| Operation | Guidance |
|---|---|
| Solution annealing | ~1100–1180°C (preferably ~1120°C) followed by rapid cooling; cycle is form- and producer-specific |
| Welding filler | Matching FM 59 / ERNiCrMo-13 (2.4607) consumable, qualified for the service |
| Heat input / interpass | Controlled; recommended interpass maximum ~120°C |
| PWHT | Conditional — tied to forming history, welding procedure, service and governing code; not normally required, but not a blanket “no” |
| Forming & machining | Hot/cold forming, work hardening, machining and condition restoration per qualified practice |
| Weld cleanliness | Removal of heat tint; root preparation, shielding/back purging and dissimilar-joint dilution controlled |
Weld procedures and consumables are qualified for the intended service; dissimilar joints account for dilution and design acceptance.
Testing & Documentation
| Item | Scope |
|---|---|
| Intergranular corrosion | ASTM G28 — state method, acceptance criterion, specimen condition and purchaser requirement |
| PMI | Confirms alloy identity within the instrument’s capability; does not replace full laboratory chemistry |
| Certification | EN 10204 3.1 (manufacturer) vs 3.2 (independent/third-party) — specified at ordering |
| Traceability | Heat-number traceability supported |
Certificate type and required tests are agreed at ordering rather than promised unconditionally.
Applications
| Area | Examples |
|---|---|
| Flue-gas desulphurisation | Scrubbers, absorbers, ductwork and internals in high-chloride, acidic condensate |
| Chemical process | Acid coolers, heat exchangers, reactors, columns and piping in sulphuric/hydrochloric and mixed-acid service |
| Pollution control | Wet scrubbing and acid-handling equipment |
| Acid production/handling | Vessels, piping and fittings in contaminated acid environments |
Generic industry names alone do not establish suitability; equipment, process conditions and selection limitations are reviewed for each case.
Product Range
The alloy 59 range can be supplied with related pipes, tubes, butt weld fittings, forged fittings, flanges, fasteners and custom fabricated items where required by the BOQ.
Applications
For dimensional references, see the Pipe Schedule & Fittings Guide. For related supply, review Pipes & Tubes, Butt Weld Fittings, Forged Fittings and Flanges.
Types of Products
| Type | Description |
|---|---|
| Pipes & Tubes | Seamless, welded and large-diameter supply |
| Fittings | Butt weld, forged and fabricated fittings |
| Flanges | Forged flanges and special machined items |
| Plates / Bars / Round Bars | Subject to grade and project availability |
Available Forms
Related Pages
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Frequently Asked Questions
Is Alloy 59 the same as Nicrofer 5923 hMo and UNS N06059?
Yes — UNS N06059 (Werkstoff 2.4605, NiCr23Mo16Al) is the nickel-chromium-molybdenum alloy marketed as VDM Alloy 59 / Nicrofer 5923 hMo. We identify material by UNS N06059 and the applicable specification; a producer or brand name does not mean every generic N06059 item was made by that producer, and Sagiant is an independent supplier and stockist, not the alloy producer.
Is FM 59 the same material as base-metal Alloy 59?
No. FM 59 is the matching welding consumable — Werkstoff 2.4607, classified ERNiCrMo-13 under AWS A5.14 — and is a separate record from base metal Alloy 59 (2.4605). Powder 59 for additive manufacturing is a further separate feedstock route, and deposited or welded material is not automatically described by wrought base-metal properties.
What is the chemical composition of Alloy 59?
Published N06059 limits are approximately Cr 22.0–24.0, Mo 15.0–16.5, Fe ≤1.5, C ≤0.010, Al 0.10–0.40, with Si, Mn, Co, Cu, P and S controlled and nickel as balance. “Balance” is not a measured heat analysis, and specification limits, nominal composition and the actual heat analysis on the certificate are different datasets — the mill certificate governs. The applicable ASTM edition is confirmed per order.
Which specifications and standards apply to Alloy 59?
By product form: ASTM B622 (seamless pipe/tube), B619/B626 (welded pipe/tube), B574 (bar), B575 (sheet/plate/strip), B564 (forgings) and B366 (fittings), plus VdTÜV Werkstoffblatt 505 for pressure applications. A dimensional standard such as B16.5 or B16.9 does not by itself certify Alloy 59 material. EN 10216-5 covers stainless-steel pressure tubes and is not a generic nickel-alloy tube certification; it is not applied unconditionally. Editions are confirmed per order with EN 10204 3.1 or 3.2 documentation.
Does Alloy 59 outperform C-22 and C-276 in every environment?
Not universally. Alloy 59 is a high-performance Ni-Cr-Mo alloy with strong resistance to oxidising and reducing acids, pitting, crevice corrosion and stress-corrosion cracking, but performance depends on concentration, temperature, impurities, aeration, velocity, crevices and weld condition. Composition totals alone (for example Cr+Mo, where Alloy 2120 is higher) do not rank service performance — suitability is confirmed against corrosion data for the actual fluid.
Does Alloy 59 require post-weld heat treatment?
It depends. Alloy 59 is normally welded and used in the as-welded, solution-annealed condition, and PWHT is often not required — but this is conditional on forming history, the qualified welding procedure, the service and the governing code, not an absolute rule. Solution annealing, when applied, is around 1100–1180°C (preferably ~1120°C) with rapid cooling, and a matching FM 59 / ERNiCrMo-13 filler is used.
What information is needed for a quotation?
Provide the product form, dimensions and tolerances, quantity, condition, the exact specification and edition, service chemistry, concentration and temperature, required testing (for example ASTM G28 intergranular corrosion), traceability and certificate type (EN 10204 3.1 or 3.2), finish and delivery location. Availability and the accepted specification route are confirmed with the quotation.
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