Bar and Rod
Plate and Sheet
Strip
Pipe and Tube
Wire
Welding
Powder Material
Cast Products
Forged Products
Fittings
Fastening
Round Bar:
φ2–500 mm, 1–6 m length
Flat/Square Bar:
4–100 mm thickness/width
Hex Bar:
A/F 3–100 mm
Hollow Bar:
OD 20–300 mm
Sheet:
0.3–6 mm thickness
Medium Plate:
6–25 mm thickness
Heavy Plate:
25–100 mm thickness
Standard Strip:
0.05–3 mm thick,
10–600 mm wide
Precision strip:
0.01–0.5 mm thick,
tight tolerance ±0.005 mm
Foil:
0.005–0.1 mm thick
Seamless Tube:
OD 6–450 mm,
WT 1–50 mm,
1–12 m length
Welded Tube:
OD 10–600 mm,
WT 1–20 mm
Capillary Tube:
OD 1–10 mm,
WT 0.1–2 mm
Wire Form:
Cold Drawn Wire,
Bright Wire,
Spring Wire,
Fine Wire,
Ultra-fine Wire
General Diameter:
φ0.1–10 mm
Coil Weight:
50–500 kg,
customizable tolerance
Solid Wire:
φ0.8–4.0 mm
Flux-cored Wire:
φ1.2–4.0 mm
Welding Rod:
φ2.0–5.0 mm
Powder Form:
AM 3D Printing Powder,
Spherical Powder,
Gas-atomized Powder,
Water-atomized Powder
Particle Size:
10–150 μm
Sphericity:
≥90% for AM grade
Cast Ingot:
φ200–800 mm
Precision Casting:
min wall 0.5 mm
Cast Pipe:
OD 100–600 mm,
WT 10–50 mm
Forged Bar:
Φ35–500 mm
Forged Ring:
OD 200–2000 mm
Forging Weight:
1–5000 kg
Fittings Form:
Elbow, Tee, Reducer, Flange, Cap, Outlet, Lap Joint
Size range:
1/2''–24'' (DN15–DN600)
Wall thickness:
Sch10–Sch160, STD, XS, XXS
Pressure Class:
150–2500 LB
Fastening Form:
Bolt, Nut, Screw, Stud, Washer, Pin, Rivet
Metric: M3–M64
Imperial: #4–2.5''
Length: 6–500 mm
2.4642 is a single-phase, austenitic high-chromium nickel–chromium–iron alloy offering outstanding resistance to corrosive aqueous media and high-temperature atmospheres. This datasheet presents the material within the Werkstoff-Nummer designation system.
Its very high chromium content (around 30%) gives outstanding resistance to oxidising chemicals and to high-temperature oxidising gases, while the high nickel content imparts resistance to chloride-induced stress-corrosion cracking and to caustic (alkali) solutions. The alloy has good mechanical properties at both room and elevated temperature paired with high ductility, good metallurgical stability and favorable fabrication characteristics. The low carbon content minimises grain-boundary carbide precipitation, preserving corrosion resistance in the heat-affected zones of welded joints.
The alloy shows very good resistance to fluoride-containing hot nitric acid, excellent resistance to stress-corrosion cracking in chloride- and polythionic-acid-bearing media, and good resistance to oxidation, sulphidation and metal dusting in hot gases. It is the standard material for the primary and secondary loops of nuclear reactors (steam generator tubing), and is used in nitric acid and pickling installations, with operating capability up to approximately 1000 °C.
| Property | Value | Unit |
|---|---|---|
| Density | 8.20 | g/cm³ |
| Melting range | 1390–1410 | °C |
| Elastic modulus | 211 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 14.0 | µm/m·°C |
| Relative magnetic permeability (20 °C) | ≤1.01 | — |
| Maximum operating temperature | ~1000 | °C |
| Structure | Single-phase austenitic (FCC) | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel | Ni | 58.0 | — | Austenitic FCC matrix; SCC + alkali resistance |
| Chromium | Cr | 27.0 | 31.0 | Oxidation + oxidising-acid resistance; passive film |
| Iron | Fe | 7.0 | 11.0 | Solid-solution element |
| Manganese | Mn | — | 0.50 | Deoxidiser |
| Silicon | Si | — | 0.50 | Deoxidiser |
| Copper | Cu | — | 0.50 | Residual |
| Carbon | C | — | 0.05 | Low; minimises HAZ carbide precipitation |
| Sulphur | S | — | 0.015 | Residual impurity |
Typical values; confirm against the inspection certificate (EN 10204) for each delivery.
| Condition | Property | Value |
|---|---|---|
| Solution-annealed | Tensile strength (Rm) | 590–750 MPa |
| Solution-annealed | 0.2% proof strength (Rp0.2) | ≥240 MPa |
| Solution-annealed | 1.0% proof strength (Rp1.0) | ≥280 MPa |
| Solution-annealed | Elongation | ≥30 % |
| — | Elastic modulus | 211 GPa |
The alloy is a single-phase solid-solution material; it is not age-hardenable. Higher strength is obtained by cold work. Mechanical properties are given as a range with a 1.0% proof value, per the European convention.
| Environment | Performance | Notes |
|---|---|---|
| Nitric acid (HNO₃) | Outstanding | Very high chromium content |
| Fluoride-containing hot nitric acid | Very Good | Pickling installations |
| Caustic / alkali | Outstanding | High nickel content |
| Chloride stress-corrosion cracking | Outstanding | High nickel content |
| Polythionic-acid SCC | Excellent | Resistant in service environments |
| High-temperature oxidation | Outstanding | Stable Cr₂O₃ scale |
| Sulphidation / metal dusting | Good | High Cr + Ni in hot gases |
The alloy is a single-phase, solid-solution material and is NOT age-hardenable. Heat treatment is for solution annealing only.
Solution Anneal Purpose: Dissolves secondary phases, restores maximum corrosion resistance and ductility, recrystallises cold-worked structure. Typically 1040–1100 °C followed by rapid cooling (water quench) to retain the single-phase structure. A thermal treatment (e.g. ~715 °C) is sometimes applied to nuclear tubing to optimise the grain-boundary carbide structure and stress-corrosion-cracking resistance.
Cold work is used to increase strength where required; a subsequent solution anneal removes the effects of cold work.
Excellent weldability; the low carbon content preserves corrosion resistance in the heat-affected zone. Matched-composition welding products give as-welded resistance in oxidising and alkali environments.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Excellent | Matching Ni-Cr-29-Fe filler |
| GMAW / MIG | Excellent | Matching Ni-Cr-29-Fe filler |
| SMAW / stick | Excellent | Matching Ni-Cr-Fe electrode |
The welding products are also used for dissimilar-metal and overmatched welding. No post-weld heat treatment is normally required.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Work hardening | High rate (typical of Ni-Cr-Fe alloys); rigid setup, sharp tooling, positive rake |
| Cutting | Low speed, sufficient feed/depth to cut below the work-hardened layer |
| Coolant | Ample flood coolant |
| Preferred condition | Solution-annealed |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | Readily cold-formed; high work-hardening rate; intermediate solution anneal for heavy reductions |
| Hot forming | ~1150–950 °C; followed by rapid cooling to retain single-phase structure |
| Tube / bar | Standard product forms for steam generator and process service |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Nuclear power | Steam generator tubes, tubesheets, baffles | Chloride/alkali SCC resistance; reactor loops |
| Chemical processing | Nitric acid plant, pickling tanks and coils | Nitric / HF acid resistance |
| Heat treatment | Furnace components, retorts, fixtures | High-temperature oxidation resistance |
| Petrochemical | High-temperature process equipment | Oxidation + metal-dusting resistance |
| Pollution control | Acid-bearing process hardware | Oxidising-media resistance |
| Product Form | DIN Standard | EN / ISO Standard |
|---|---|---|
| Sheet, plate and strip | DIN 17742 / DIN 17750 | EN ISO 6208 |
| Rod and bar | DIN 17742 / DIN 17752 | — |
| Wire | DIN 17753 | — |
| Seamless tube | DIN 17751 | EN ISO 6208 |
| Forgings | DIN 17754 | — |
| Technical delivery | VdTÜV-Wbl. 485 | — |
Qualified for sour-service per ISO 15156-3 / NACE MR0175.
| W.Nr. | Ni % | Cr % | Fe % | Other | Best Used For |
|---|---|---|---|---|---|
| 2.4642 | ≥58 | 27–31 | 7–11 | — | Nuclear SG tubing; nitric acid; high-temp oxidation |
| 2.4816 | ≥72 | 14–17 | 6–10 | — | General Ni-Cr-Fe; high-temperature service |
| 2.4851 | 58–63 | 21–25 | bal | Al 1–1.7 | High-temperature oxidation resistance |
| 2.4856 | ≥58 | 20–23 | ≤5 | Mo 8–10; Nb 3.15–4.15 | Seawater; chemical process; high strength |
| 1.4876 | 30–34 | 19–23 | bal | Al, Ti | High-temperature Fe-Ni-Cr |
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