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
2.4675 is a solid-solution nickel-chromium-molybdenum alloy with a deliberate copper addition ( / Alloy 2000). This datasheet presents the material within the European (DIN / EN / Werkstoff-Nummer) standard system.
Unlike the chromium-free "B" family, 2.4675 contains about 23% chromium together with 16% molybdenum and a small (~1.6%) copper addition. This combination makes it unusually versatile: the high chromium gives resistance to oxidising chemicals and to process streams contaminated with ferric ions or dissolved oxygen, while the molybdenum and copper give resistance to reducing acids such as sulphuric, hydrochloric and hydrofluoric. It thus performs well in both oxidising and reducing environments — a combination that earlier Ni-Cr-Mo alloys could not cover. It is fully austenitic, ductile, readily formed and welded, and has outstanding resistance to pitting, crevice attack and chloride stress-corrosion cracking.
Typical applications include chemical-process equipment (reactors, heat exchangers, columns, valves and pumps), petrochemical piping, pharmaceutical equipment, flue-gas-desulphurization plant and other service handling mixed or variable oxidising/reducing media. The grade is listed in ISO 15156-3 for sour service.
Values per reference data (manufacturer / DIN), solution-annealed condition.
| Property | Value | Unit |
|---|---|---|
| Density | 8.50 | g/cm³ |
| Melting range | 1330–1400 | °C |
| Young's modulus (20 °C) | ~207 | GPa |
| Thermal conductivity (20 °C) | ~9.1 | W/m·K |
| Coefficient of thermal expansion (20–100 °C) | ~12.4 | µm/m·°C |
| Electrical resistivity (20 °C) | ~1.28 | µΩ·m |
| Magnetic response | Non-magnetic (austenitic) | — |
Composition per DIN 17744 (W.Nr. 2.4675, NiCr23Mo16Cu).
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel | Ni | Balance | — | Base; reducing-media + SCC resistance |
| Chromium | Cr | 22.0 | 24.0 | Oxidising-media resistance |
| Molybdenum | Mo | 15.0 | 17.0 | Reducing-acid + pitting/crevice resistance |
| Copper | Cu | 1.3 | 1.9 | Enhanced sulphuric-acid resistance |
| Iron | Fe | — | 3.0 | Residual |
| Cobalt | Co | — | 2.0 | Residual |
| Manganese | Mn | — | 0.5 | Deoxidiser |
| Aluminium | Al | — | 0.5 | Deoxidiser |
| Carbon | C | — | 0.01 | Ultra-low (thermal stability) |
| Silicon | Si | — | 0.08 | Very low |
| Phosphorus | P | — | 0.025 | Residual impurity |
| Sulphur | S | — | 0.010 | Residual impurity |
Nominal: Ni-23Cr-16Mo-1.6Cu. The 23% chromium gives oxidising-media resistance; 16% molybdenum with 1.6% copper give reducing-acid (sulphuric/hydrochloric/hydrofluoric) resistance — combining performance in both oxidising and reducing environments.
Solution-annealed condition, per DIN 17750/17752 (temper F69) for W.Nr. 2.4675.
| Property | Value | Unit |
|---|---|---|
| Tensile strength (Rm) | ≥690 | MPa |
| 0.2% proof strength (Rp0.2) | ≥300 | MPa |
| Elongation at fracture (A) | ≥40 | % |
| Brinell hardness | ≤210 | HB |
Values per EN/DIN; confirm against the inspection certificate (EN 10204).
| Environment | Performance | Notes |
|---|---|---|
| Oxidising media | Excellent | High chromium (23%) |
| Reducing acids (H₂SO₄, HCl, HF) | Excellent | Mo 16% + Cu 1.6% |
| Mixed oxidising/reducing | Excellent | Versatile — both environments |
| Pitting / crevice (chlorides) | Outstanding | CPT in 6% FeCl₃ ~145 °C |
| Chloride SCC | Outstanding | High nickel content |
| Ferric/cupric-contaminated acids | Resistant | High Cr (unlike B-family) |
| Intergranular (welded) | Resistant | Ultra-low carbon |
A solid-solution alloy; it cannot be hardened by heat treatment. Corrosion properties are developed by solution annealing.
Solution anneal: approximately 1080–1120 °C, followed by rapid cooling (water quench or rapid air), to dissolve secondary phases and put chromium, molybdenum and copper into solution for optimum corrosion resistance.
The ultra-low carbon content resists carbide precipitation; after significant cold work, a final solution anneal restores optimum corrosion resistance.
Good weldability; the controlled low-carbon chemistry resists carbide precipitation in the weld heat-affected zone. GTAW and GMAW are commonly used with a matching Ni-Cr-Mo filler.
| Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Excellent | Matching W.Nr. 2.4675-type Ni-Cr-Mo filler |
| GMAW / MIG | Good | Matching W.Nr. 2.4675-type Ni-Cr-Mo filler |
| SMAW / stick | Good | Matching Ni-Cr-Mo electrode |
No preheat required; control interpass temperature. Most applications are used in the as-welded condition.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Machinability | Tough; high work-hardening rate (typical of Ni-Cr-Mo alloys); sharp tooling, slow speeds |
| Work hardening | High rate; rigid setup, positive feeds, avoid dwelling |
| Coolant | Ample flood coolant |
Forming Processes
| Process | Notes |
|---|---|
| Hot working | Narrow range; solution anneal + quench after |
| Cold forming | Work-hardens; intermediate anneal for severe forming |
| Solution anneal | ~1080–1120 °C, rapid cool |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Chemical processing | Reactors, heat exchangers, columns, valves, pumps | Mixed oxidising/reducing resistance |
| Petrochemical | Piping, process equipment | Acid + chloride resistance |
| Pharmaceutical | Process equipment, vessels | Corrosion + purity |
| Flue-gas desulphurization | Scrubbers, ducting | Halide + acid resistance |
| Sulphuric-acid service | Equipment for H₂SO₄ | Cu-enhanced acid resistance |
| Marine / pollution control | Components in chloride media | Pitting + SCC resistance |
| Product Form | Standard | Notes |
|---|---|---|
| Plate, sheet and strip | DIN 17750 · W.Nr. 2.4675 | NiCr23Mo16Cu |
| Bar, rod and wire | DIN 17752 · W.Nr. 2.4675 | — |
| Forgings and fittings | DIN 17754 · W.Nr. 2.4675 | — |
| Seamless / welded tube | DIN 17751 · W.Nr. 2.4675 | — |
| Sour service | ISO 15156-3 | Acid-gas applications |
Nickel-chromium-molybdenum-copper alloy ( / Alloy 2000). W.Nr. 2.4675 (NiCr23Mo16Cu); DIN 17744 / 17750. VDM grade (Nicrofer 5621).
| W.Nr. | Cr % | Mo % | Other | Best Used For |
|---|---|---|---|---|
| 2.4675 | 22–24 | 15–17 | Cu 1.3–1.9 | Oxidising + reducing; sulphuric acid (Cu) |
| 2.4819 | 14.5–16.5 | 15–17 | W 3–4.5 | Broad oxidising + reducing (C-276) |
| 2.4602 | 20–22.5 | 12.5–14.5 | W 2.5–3.5 | Highest pitting resistance (C-22) |
| 2.4610 | 14–17 | 14–17 | Ti ≤0.7 | Thermal stability (C-4) |
| 2.4600 | 0.5–3 | 26–32 | — | Pure reducing acids / HCl (B-3) |
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