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
NiCr22Mo7Cu is the EN symbol designation for a nickel-chromium-iron corrosion-resistant alloy with additions of molybdenum and copper. This datasheet presents the material within the EN symbol designation system.
A nickel-chromium-iron alloy with molybdenum and copper additions, NiCr22Mo7Cu has several minor elements controlled to give increased resistance to heat-affected-zone (HAZ) corrosion and improved weldability. It offers excellent corrosion resistance to oxidizing chemicals and atmospheres, while its nickel and copper contents provide resistance to reducing chemicals; the nickel gives exceptional stress-corrosion-cracking resistance in chloride environments, the high molybdenum gives very good pitting and crevice resistance, and the low carbon prevents sensitisation and intergranular corrosion. It is particularly suited to reducing acids such as phosphoric and sulfuric, and to flue-gas desulfurisation. Its relatively high iron content makes it a cost-effective choice among nickel corrosion-resistant alloys. It is supplied in the solution-annealed condition, and in the cold-worked-and-aged condition for high-strength oilfield use.
Typical applications include flue-gas desulfurisation scrubbers (quenchers, dampers, ducting), phosphoric and sulfuric acid handling, and oil-and-gas country tubular goods (OCTG), packers and downhole equipment in sour, high-chloride wells.
| Property | Value | Unit |
|---|---|---|
| Density | 8.31 | g/cm³ |
| Melting range | 1330–1370 | °C |
| Elastic modulus | 199 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 13.5 | µm/m·°C |
| Thermal conductivity (20 °C) | 9.8 | W/m·K |
| Specific heat (20 °C) | 460 | J/kg·K |
| Structure | Austenitic (FCC), single phase | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel | Ni | Balance | — | Base element; SCC / reducing-media resistance |
| Chromium | Cr | 21.0 | 23.5 | Oxidizing-media / pitting resistance |
| Iron | Fe | 18.0 | 21.0 | Base alloying; cost-effectiveness |
| Molybdenum | Mo | 6.0 | 8.0 | Pitting / crevice resistance |
| Copper | Cu | 1.50 | 2.50 | Reducing-acid resistance |
| Cobalt | Co | — | 5.0 | Residual |
| Tungsten | W | — | 1.50 | Minor; localized-corrosion resistance |
| Niobium | Nb | — | 0.50 | Stabiliser |
| Carbon | C | — | 0.015 | Low; prevents sensitisation |
Solution-annealed condition, per EN reference data for W.Nr. 2.4619.
| Condition | Property | Value |
|---|---|---|
| Solution annealed | Tensile strength (Rm) | ≥620 MPa |
| Solution annealed | 0.2% proof strength (Rp0.2) | ≥240 MPa |
| Solution annealed | Elongation (A5) | ≥45 % |
| Cold-worked (OCTG) | Proof strength | higher; high-strength grades |
| — | Elastic modulus | 199 GPa |
Values per EN reference data; the low carbon content preserves corrosion resistance in the weld heat-affected zone. Confirm against the inspection certificate (EN 10204).
| Environment | Performance | Notes |
|---|---|---|
| Oxidizing chemicals / atmospheres | Excellent | High chromium content |
| Reducing acids (phosphoric, sulfuric) | Excellent | Nickel + copper + molybdenum |
| Pitting / crevice corrosion | Very Good | High molybdenum |
| Chloride stress-corrosion cracking | Excellent | High nickel content |
| Intergranular / HAZ corrosion | Excellent | Low carbon; controlled minor elements |
The balance of chromium, molybdenum, copper and nickel gives broad resistance to both oxidizing and reducing media — notably phosphoric and sulfuric acids and flue-gas environments — with excellent resistance to chloride stress-corrosion cracking and to intergranular attack in the as-welded condition.
A single-phase solid-solution alloy; not hardenable by precipitation. Properties are set by solution annealing; high strength is obtained by cold work.
Solution Anneal Solution anneal at approximately 1120 °C and rapidly quench (water or rapid air cool) to dissolve secondary phases and restore corrosion resistance. The alloy is not strengthened by heat treatment; cold work raises strength for oilfield products.
Good weldability; readily welded by the gas-tungsten-arc and gas-metal-arc processes with matching filler, and resistant to intergranular corrosion in the as-welded condition owing to its low carbon content. No post-weld heat treatment is normally required.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Good | Matching filler |
| GMAW / MIG | Good | Matching filler |
| SMAW / stick | Good | Matching electrode |
Weld with matching filler and clean surfaces; the alloy may be used as-welded without post-weld heat treatment.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Machinability | Difficult; work-hardens, rigid setups, sharp tooling |
| Speeds | Slow speeds, positive feeds, no dwelling |
| Coolant | Ample coolant |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | Good; work-hardens; cold work also used to raise strength |
| Hot forming | 1010–1175 °C; solution anneal afterward |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Pollution control | FGD scrubbers, quenchers, dampers, ducting | Acid + flue-gas resistance |
| Acid production | Phosphoric / sulfuric acid equipment | Reducing-acid resistance |
| Oil & gas | OCTG tubulars, packers, downhole equipment | Sour-service + chloride resistance |
| Chemical process | Reactors, heat exchangers | General + localized corrosion resistance |
| Product Form | DIN / EN Standard | Notes |
|---|---|---|
| Plate, sheet and strip | DIN 17750 · W.Nr. 2.4619 | NiCr22Mo7Cu |
| Bar, rod and forgings | DIN 17752 · W.Nr. 2.4619 | — |
| Seamless pipe and tube | DIN 17751 · W.Nr. 2.4619 | — |
| Inspection documents | EN 10204 | — |
Nickel-chromium-iron corrosion-resistant alloy with molybdenum and copper. W.Nr. 2.4619 (NiCr22Mo7Cu).
| EN Symbol | Cr % | Mo % | Fe % | Best Used For |
|---|---|---|---|---|
| NiCr22Mo7Cu | 21–23.5 | 6–8 | 18–21 | Ni-Cr-Fe-Mo-Cu; reducing acids, FGD, sour OCTG |
| NiCr30FeMo | 28–31.5 | 4–6 | 13–17 | Higher-chromium G-family; phosphoric acid (G-30) |
| NiCr21Mo | 19.5–23.5 | 2.5–3.5 | balance | Ni-Fe-Cr-Mo-Cu; sulfuric / phosphoric acid (825) |
| NiCr22Mo9Nb | 20–23 | 8–10 | ≤5 | General Ni-Cr-Mo-Nb corrosion / strength (625) |
| NiMo16Cr15W | 14.5–16.5 | 15–17 | 4–7 | Reducing media, wet chlorine (C-276) |
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