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
X1CrNiMoCuN20-18-7 is a special-grade super-austenitic chromium-nickel-molybdenum-copper stainless steel with nitrogen (W.Nr. 1.4547), classified in EN 10088 as an austenitic stainless steel of special grade for highly corrosive service. This datasheet presents the material within the European standard system.
Its high chromium, nickel, molybdenum, copper and nitrogen contents give outstanding resistance to localized corrosion — pitting and crevice corrosion — and to stress-corrosion cracking, together with acceptable seawater-corrosion resistance. It is resistant to intergranular corrosion both in the delivery condition and in the welded (sensitised) condition up to about 400 °C. It combines high ductility and good notch toughness, including at sub-zero temperatures, with strength substantially above the standard austenitic grades. It is fully austenitic and essentially non-magnetic (small amounts of ferrite or martensite from cold deformation can increase magnetisability), and cannot be hardened by heat treatment.
Typical applications include seawater and chloride-process handling, desalination and offshore equipment, flue-gas-desulphurization plant, pulp-and-paper bleach systems, and food and chemical processing equipment. The grade is covered by VdTÜV-Wbl 473 for pressure applications.
Values per reference data (EN 10088 / VdTÜV-Wbl 473), solution-annealed (+AT) condition.
| Property | Value | Unit |
|---|---|---|
| Density | 8.0 | g/cm³ |
| Young's modulus (20 °C) | 195 | GPa |
| Thermal conductivity (20 °C) | ~14 | W/m·K |
| Coefficient of thermal expansion (20–100 °C) | ~16.5 | µm/m·°C |
| Electrical resistivity (20 °C) | ~0.85 | µΩ·m |
| Max. temperature (intergranular resistance, welded) | ~400 | °C |
| Magnetic response | Non-magnetic (austenitic) | — |
Limiting composition per EN 10088-3 (W.Nr. 1.4547).
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Iron | Fe | Balance | — | Base element |
| Chromium | Cr | 19.5 | 20.5 | Passivity; pitting resistance |
| Nickel | Ni | 17.5 | 18.5 | Austenite stability; SCC resistance |
| Molybdenum | Mo | 6.0 | 7.0 | Pitting + crevice corrosion resistance |
| Copper | Cu | 0.5 | 1.0 | Resistance to reducing acids |
| Nitrogen | N | 0.18 | 0.25 | Pitting resistance; strength; austenite stability |
| Manganese | Mn | — | 1.0 | Austenite stabiliser |
| Silicon | Si | — | 0.7 | Deoxidiser |
| Carbon | C | — | 0.02 | Very low (intergranular-corrosion resistance) |
| Phosphorus | P | — | 0.03 | Residual impurity |
| Sulphur | S | — | 0.01 | Residual impurity |
Composition per EN 10088-3 for W.Nr. 1.4547 (X1CrNiMoCuN20-18-7). The EN molybdenum range (6.0-7.0%) and nitrogen range (0.18-0.25%) define this special-grade super-austenitic steel; resistance to intergranular corrosion is retained in the delivery and welded condition.
Solution-annealed (+AT) condition, per EN 10088-3 for W.Nr. 1.4547.
| Property | Value | Unit |
|---|---|---|
| Tensile strength (Rm) | 650–850 | MPa |
| 0.2% proof strength (Rp0.2) | ≥300 | MPa |
| Elongation at fracture (A) | ≥35 | % |
| Hardness | ≤260 | HB |
Properties are quoted for the solution-annealed condition per EN 10088-3. The steel is resistant to intergranular corrosion in both the delivery and the welded (sensitised) condition. Values per EN; confirm against the inspection certificate (EN 10204).
| Environment | Performance | Notes |
|---|---|---|
| Pitting / crevice (localized) | Outstanding | High Cr + Mo + N |
| Stress-corrosion cracking | Excellent | High Ni content |
| Seawater | Acceptable / good | — |
| Intergranular (delivery + welded) | Resistant | Confirmed to ~400 °C |
| Reducing acids | Good | Copper-enhanced |
| Sub-zero notch toughness | Very good | Fully austenitic |
| Hot oxidising / high temperature | Limited | A corrosion-resistant grade |
A special-grade austenitic stainless steel; not hardenable by heat treatment. Corrosion properties are developed by solution annealing (+AT).
Solution Anneal heating to the solution-annealing temperature followed by rapid cooling (water quench) to dissolve secondary phases and put molybdenum and nitrogen into solution for optimum corrosion resistance.
Because of the high molybdenum content, rapid cooling from the annealing temperature is essential to avoid intermetallic-phase precipitation. The material is supplied and used in the solution-annealed (+AT) condition; resistance to intergranular corrosion is retained in the welded condition up to about 400 °C.
Suitable for welding by manual metal-arc, TIG and plasma welding, using alloyed covered rod electrodes, welding rods or welding wire of the NiCr20Mo9Nb type (per VdTÜV-Wbl 473). The interpass temperature should not exceed about 100 °C; no preheating and no post-weld heat treatment are required. The steel resists intergranular corrosion in the welded condition up to about 400 °C.
| Process | Applicability | Filler / Consumable |
|---|---|---|
| TIG / plasma | Very good | NiCr20Mo9Nb-type wire/rod |
| Manual metal-arc | Good | NiCr20Mo9Nb-type covered electrodes |
Interpass temperature max. ~100 °C; no preheat or post-weld heat treatment. Over-alloyed (NiCr20Mo9Nb) filler maintains weld corrosion resistance.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Machinability | Moderate; prone to work hardening; sharp tooling |
| Speed / feed | Lower cutting speeds, greater cutting depths, ample lubrication |
| Work hardening | High; rigid setup, positive feeds |
| Coolant | Ample flood coolant |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | Cold-rolled strip/sheet, drawn wire and profiles; work-hardens |
| Hot forming | Followed by solution anneal (+AT) + rapid cool |
| Solution anneal (+AT) | Rapid water quench |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Marine / offshore | Seawater piping, offshore equipment | Chloride pitting/crevice resistance |
| Desalination | Desalination plant components | Seawater corrosion resistance |
| Power | Flue-gas-desulphurization plant | Halide + acid resistance |
| Pulp & paper | Bleach-plant equipment | Halide / bleach resistance |
| Food & chemical | Process equipment, tanks, vessels | Corrosion resistance |
| Pressure equipment | VdTÜV-Wbl 473 components | Pressure + corrosion (to ~400 °C) |
| Product Form | Standard | Notes |
|---|---|---|
| Sheet, plate and strip | EN 10088-2 · W.Nr. 1.4547 | X1CrNiMoCuN20-18-7 |
| Bar, rod, wire and sections | EN 10088-3 · W.Nr. 1.4547 | — |
| Bar for pressure purposes | EN 10272 · W.Nr. 1.4547 | — |
| Seamless / welded tube | EN 10216-5 / 10217-7 · W.Nr. 1.4547 | — |
| Pressure approval | VdTÜV-Wbl 473 | strip, sheet, welded tube |
Special-grade super-austenitic 6Mo stainless steel. W.Nr. 1.4547 (X1CrNiMoCuN20-18-7); EN 10088; VdTÜV-Wbl 473.
| EN/W.Nr. | Nominal | PREN | Best Used For |
|---|---|---|---|
| X1CrNiMoCuN20-18-7 | 20Cr-18Ni-6.1Mo-Cu-N | 42–44 | Seawater 6Mo; high Ni/Mo super-austenitic |
| X1NiCrMoCuN25-20-7 | 25Ni-20Cr-6.5Mo-Cu-N | 38–43 | 6Mo with higher Ni |
| X1NiCrMoCu25-20-5 | 25Ni-20Cr-4.5Mo-Cu | ~34 | Acid service (lower Mo) |
| X2CrNiMo17-12-2 | 12Ni-17Cr-2.1Mo | ~24 | General stainless (reference) |
| X2CrNiMoN22-5-3 | 22Cr-5Ni-3Mo-N | ~35 | Duplex (higher strength) |
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