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
2.4600 is a solid-solution nickel–molybdenum alloy — the most advanced member of the "B" family — combining the outstanding hydrochloric-acid resistance of the B-type alloys with greatly improved thermal and structural stability. This datasheet presents the material within the European (DIN / EN / Werkstoff-Nummer) standard system.
It exhibits extremely high resistance to pure hydrochloric, hydrobromic and sulphuric acids, and withstands fluoride-bearing media and concentrated sulphuric acid that damage zirconium alloys. Its defining advantage over the earlier B-2 is markedly better resistance to the intermetallic (Ni₄Mo / β) phase precipitation that causes embrittlement, which means fewer concerns during welding, fabrication and elevated-temperature service. In the mill-annealed condition it is ductile, readily formed and welded, and resists chloride-induced stress-corrosion cracking — in boiling 45% magnesium chloride (ISO 7539 / equivalent) it showed no cracking after 1008 hours.
Like all B-family alloys it is essentially chromium-free; it should not be used in oxidising environments or in reducing acids contaminated with oxidising salts (e.g. ferric or cupric chloride). It is used widely in chemical-process-industry reaction vessels for pure, reducing-acid service, and is listed in ISO 15156-3 / ISO 15156 for sour service.
Typical values, solution-annealed condition.
| Property | Value | Unit |
|---|---|---|
| Density | 9.22 | g/cm³ |
| Melting range | 1370–1418 | °C |
| Young's modulus (20 °C) | 216 | GPa |
| Specific heat capacity (20 °C) | 379 | J/kg·K |
| Thermal conductivity (20 °C) | 12.0 | W/m·K |
| Electrical resistivity (20 °C) | 1.37 | µΩ·m |
| Coefficient of thermal expansion (20–100 °C) | 10.5 | µm/m·°C |
| Maximum service temperature (oxidising) | ~550 | °C |
| Structure | Austenitic (FCC) | — |
Composition per DIN 17744 (W.Nr. 2.4600, NiMo29Cr / ISO Ni1067).
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel | Ni | Balance | — | Base; reducing-acid resistance |
| Molybdenum | Mo | 26.0 | 32.0 | Primary alloying; HCl resistance |
| Iron | Fe | 1.0 | 6.0 | Controlled |
| Chromium | Cr | 0.5 | 3.0 | Minor (thermal stability) |
| Cobalt | Co | — | 3.0 | Residual |
| Manganese | Mn | — | 3.0 | Deoxidiser |
| Tungsten | W | — | 3.0 | Residual |
| Aluminium | Al | 0.1 | 0.5 | Deoxidiser |
| Niobium (+ Ta) | Nb | — | 0.4 | Stabiliser |
| Copper | Cu | — | 0.5 | Residual |
| Carbon | C | — | 0.01 | Ultra-low; thermal stability |
| Silicon | Si | — | 0.1 | Very low |
| Phosphorus | P | — | 0.025 | Residual impurity |
| Sulphur | S | — | 0.015 | Residual impurity |
Nominal: Ni-28.5Mo-1.5Cr (third-generation alloy B). Controlled Cr/Mn/Al with ultra-low C give markedly better thermal stability, fabricability and SCC resistance than B-2, with the same HCl resistance.
Solution-annealed condition, per DIN 17744/17750 for W.Nr. 2.4600.
| Property | Value | Unit |
|---|---|---|
| Tensile strength (Rm) | ≥750 | MPa |
| 0.2% proof strength (Rp0.2) | ≥340 | MPa |
| Elongation at fracture (A) | ≥40 | % |
| Brinell hardness | ≤240 | HB |
Values per EN/DIN; confirm against the inspection certificate (EN 10204).
| Environment | Performance | Notes |
|---|---|---|
| Hydrochloric acid (all conc. / temps) | Outstanding | Among the highest of any nickel alloy |
| Hydrobromic acid | Outstanding | Extremely high resistance |
| Sulphuric acid (incl. concentrated) | Excellent | Withstands concentrated H₂SO₄ |
| Hydrofluoric / fluoride media | Excellent | Resists fluoride media that damage zirconium |
| Reducing environments | Outstanding | High Ni + Mo |
| Chloride SCC | Outstanding | No cracking in boiling 45% MgCl₂ (1008 h test) |
| Thermal / structural stability | Outstanding | Greatly improved vs B-2 (resists Ni₄Mo β-phase) |
| Oxidising media / ferric or cupric salts | Poor | No chromium — avoid oxidising contaminants, Fe/Cu salts |
A solid-solution nickel–molybdenum alloy; not age-hardenable. Heat treatment is solution annealing only.
Solution Anneal Temperature: ~1065 °C (1950 °F), followed by rapid cooling (water quench) Purpose: dissolves secondary phases, restores maximum corrosion resistance and ductility.
Forming note: for cold work greater than ~7–15%, a final solution anneal is required before welding/service to avoid cracking and to restore optimum corrosion resistance. The improved thermal stability of B-3 reduces (but does not eliminate) embrittlement concerns relative to B-2.
Excellent weldability — a key advantage of B-3 over earlier B-type alloys, thanks to its improved structural stability. Usable in the mill-annealed condition; GTAW and GMAW are commonly used.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Excellent | W.Nr. 2.4600 (NiMo29Cr) matching filler |
| GMAW / MIG | Excellent | W.Nr. 2.4600 (NiMo29Cr) matching filler |
| SMAW / stick | Good | Matching Ni-Mo electrode |
If cold work exceeds ~7%, solution anneal before welding to avoid cracking. Keep the joint clean and free of iron/copper contamination, which is detrimental in subsequent acid service.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Work hardening | High rate (typical of Ni-Mo alloys); rigid setup, sharp tooling, positive rake |
| Cutting | Low speed, sufficient feed/depth to cut below work-hardened layer |
| Coolant | Ample flood coolant |
| Preferred condition | Solution-annealed |
Forming Processes
| Process | Notes |
|---|---|
| Hot forming | Hot-formable; followed by solution anneal + rapid cool |
| Cold forming | Cold-formable; for >15% cold work a final solution anneal restores optimum corrosion resistance |
| Cleanliness | Keep tooling free of iron contamination to protect acid-service performance |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Chemical processing | Reaction vessels for pure reducing acids, HCl reactors, heat exchangers, piping | HCl + reducing-acid resistance + thermal stability |
| Hydrochloric / hydrobromic acid | Process vessels, storage, piping | Extreme HCl/HBr resistance |
| Sulphuric acid (concentrated) | Process equipment | Concentrated H₂SO₄ resistance |
| Fluoride / HF service | Equipment exposed to fluoride media | Resists media that damage zirconium |
| Pharmaceutical / petrochemical | Reactors, pressure vessels | Corrosion resistance + fabricability |
| Product Form | DIN / EN Standard | VdTÜV |
|---|---|---|
| Rod and bar | DIN 17752 | VdTÜV data sheet |
| Plate, sheet and strip | DIN 17750 | VdTÜV data sheet |
| Seamless tube | DIN 17751 | VdTÜV data sheet |
| Composition / designation | W.Nr. 2.4600 · NiMo29Cr | — |
| Welding consumables | W.Nr. 2.4600 (NiMo29Cr) matching filler | — |
Werkstoff-Nummer 2.4600; listed in ISO 15156-3 / ISO 15156 for sour service.
| W.Nr. | Ni % | Cr % | Mo % | Other | Best Used For |
|---|---|---|---|---|---|
| 2.4600 | bal | 1–3 | 27–32 | C ≤0.01 | Best thermal stability; pure reducing acids |
| 2.4617 | bal | ≤1.0 | 26–30 | C ≤0.02 | Low-C; as-welded HCl service |
| 2.4800 | bal | ≤1.0 | 26–30 | Fe 4–6 | Original Ni-Mo (largely superseded) |
| 2.4819 | bal | 14.5–16.5 | 15–17 | W 3–4.5 | Oxidising + reducing; broad corrosion |
| 2.4602 | bal | 20–22.5 | 12.5–14.5 | W 2.5–3.5 | Best pitting/crevice; mixed acids |
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