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
1.4652 is a 7% molybdenum, high-nitrogen super-austenitic stainless steel — one of the most corrosion-resistant stainless steels standardised in EN 10088. This datasheet presents the material within the European standard system.
With approximately 24% chromium, 22% nickel, 7.5% molybdenum and 0.5% nitrogen, 1.4652 reaches a pitting-resistance equivalent number (PREN) of about 57, bringing its localized-corrosion resistance close to that of nickel-base alloys and titanium. The high nitrogen content also gives it very high mechanical strength while retaining good ductility, toughness and weldability. The steel resists pitting, crevice corrosion and chloride stress-corrosion cracking in severe chloride and seawater environments.
Typical applications include chlorinated-seawater systems, flue-gas-cleaning plant, plate heat exchangers, desalination equipment, bleach plant and other pressurised or erosive high-halide service where 6Mo grades are insufficient.
Values for the solution-annealed condition, per EN reference data.
| Property | Value | Unit |
|---|---|---|
| Density | 8.0 | g/cm³ |
| Melting range | 1410–1460 | °C |
| Young's modulus (20 °C) | 210 | GPa |
| Thermal conductivity (20 °C) | 9.8 | W/m·K |
| Coefficient of thermal expansion (20–100 °C) | 15 | µm/m·°C |
| Specific heat (20 °C) | 460 | J/kg·K |
| Maximum continuous service temperature | ~1100 | °C |
| Magnetic response | Non-magnetic (austenitic) | — |
Composition per EN 10088-2 (W.Nr. 1.4652, X1CrNiMoCuN24-22-8).
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Iron | Fe | Balance | — | Base element |
| Chromium | Cr | 23.0 | 25.0 | Passivity; pitting resistance |
| Nickel | Ni | 21.0 | 23.0 | Austenite stability; SCC resistance |
| Molybdenum | Mo | 7.0 | 8.0 | Pitting + crevice resistance |
| Manganese | Mn | 2.0 | 4.0 | Austenite stability; raises N solubility |
| Nitrogen | N | 0.45 | 0.55 | High strength; pitting resistance |
| Copper | Cu | 0.30 | 0.60 | Reducing-acid resistance |
| Silicon | Si | — | 0.50 | Deoxidiser |
| Carbon | C | — | 0.020 | Very low (intergranular resistance) |
| Phosphorus | P | — | 0.030 | Residual impurity |
| Sulphur | S | — | 0.005 | Residual impurity |
Nominal: 24Cr-22Ni-7.5Mo-0.5N. PREN = %Cr + 3.3×%Mo + 16×%N ≈ 57.
Solution-annealed (+AT) condition, per EN 10088-2 for W.Nr. 1.4652.
| Property | Value | Unit |
|---|---|---|
| Tensile strength (Rm) | 750–1000 | MPa |
| 0.2% proof strength (Rp0.2) | ≥430 | MPa |
| 1.0% proof strength (Rp1.0) | ≥480 | MPa |
| Elongation at fracture (A) | ≥40 | % |
| Brinell hardness | ≤270 | HB |
| Impact energy (KV, Charpy V) | ≥90 | J |
Typical solution-annealed values are around Rm 880 MPa and Rp0.2 490 MPa. Confirm against the inspection certificate (EN 10204).
| Environment | Performance | Notes |
|---|---|---|
| Chloride pitting | Outstanding | PREN ~57; very high CPT |
| Crevice corrosion | Outstanding | Among the best of stainless steels |
| Chloride SCC | Excellent | High Ni + N |
| Seawater (chlorinated) | Excellent | Resists warm chlorinated seawater |
| Reducing acids | Good | Mo + Cu assist |
| Oxidizing acids | Excellent | High Cr |
Performance approaches nickel-base alloys and titanium in seawater and high-halide service.
A solid-solution alloy; it cannot be hardened by heat treatment.
Solution Anneal approximately 1150–1200 °C, followed by rapid quenching (water) to keep nitrogen in solution and dissolve secondary phases. Because of the high alloy content, rapid cooling is essential to avoid intermetallic precipitation.
Weldable by GTAW, GMAW and SMAW. Because of the high alloy content, an over-alloyed nickel-base filler is normally used so that the weld metal matches the corrosion resistance of the base material.
| Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Excellent | Over-alloyed Ni-base filler (e.g. NiCr21Mo type) |
| GMAW / MIG | Good | Over-alloyed Ni-base filler |
| SMAW / stick | Good | Matching Ni-base electrode |
No preheat; keep interpass temperature low and control heat input to avoid intermetallic precipitation.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Machinability | Difficult; high strength + work-hardening; rigid setup, sharp tooling, slow speeds, positive feeds |
| Work hardening | High rate; avoid dwelling |
| Coolant | Ample flood coolant |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | Work-hardens rapidly; higher forces than standard austenitics |
| Hot forming | ~1150–1200 °C; solution anneal + quench afterward |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Marine / seawater | Chlorinated seawater piping, pumps, valves | Pitting + crevice resistance |
| Pulp & paper | Bleach-plant equipment | Halide + acid resistance |
| Flue-gas cleaning | Scrubbers, ducting, plate heat exchangers | Chloride + acid resistance |
| Desalination | Heat exchangers, evaporators | Hot chloride resistance |
| Chemical processing | Process equipment in high-halide media | General + localized resistance |
| Product Form | Standard | Notes |
|---|---|---|
| Plate, sheet and strip | EN 10088-2 · W.Nr. 1.4652 | X1CrNiMoCuN24-22-8 |
| Bar, rod, wire and sections | EN 10088-3 · W.Nr. 1.4652 | — |
| Seamless / welded tube | EN 10216-5 / EN 10217-7 · W.Nr. 1.4652 | — |
| Forgings | EN 10222-5 · W.Nr. 1.4652 | — |
| Sour service | ISO 15156-3 | Acid-gas applications |
7Mo super-austenitic stainless steel. W.Nr. 1.4652 (X1CrNiMoCuN24-22-8); EN 10088-2 / 10088-3.
| W.Nr. | Cr % | Mo % | N % | PREN | Best Used For |
|---|---|---|---|---|---|
| 1.4652 | 23–25 | 7.0–8.0 | 0.45–0.55 | ~57 | Most severe seawater / halide service |
| 1.4547 | 19.5–20.5 | 6.0–7.0 | 0.18–0.25 | ~43 | 6Mo seawater service |
| 1.4529 | 19–21 | 6.0–7.0 | 0.15–0.25 | ~45 | 6Mo seawater service |
| 1.4539 | 19–21 | 4.0–5.0 | — | ~35 | Sulphuric-acid service |
| 1.4462 | 21–23 | 2.5–3.5 | 0.10–0.22 | ~35 | Duplex chloride service |
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