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
GX2CrNiMoCuN25-6-3-3 is the cast counterpart of the copper-bearing super duplex stainless steel 1.4507. The "GX" prefix denotes a cast grade. This datasheet presents the material within the European standard system.
With about 25% chromium, 6% nickel, 3% molybdenum, a copper addition (~3%) and nitrogen, GX2CrNiMoCuN25-6-3-3 provides, in the as-cast and solution-annealed form, the high strength and chloride pitting / crevice / stress-corrosion-cracking resistance of copper-bearing super duplex steel, plus good resistance to reducing acids from the copper. It is the cast equivalent of the wrought grade 1.4507. Mechanical-property minima are stated for the cast condition.
Typical applications include cast pumps, valves, impellers and fittings for seawater and chemical-process (acid) service, desalination plant and oil-and-gas components.
| Property | Value | Unit |
|---|---|---|
| Density | 7.8 | g/cm3 |
| Melting range | 1350-1400 | °C |
| Young's modulus (20 °C) | 200 | GPa |
| Thermal conductivity (20 °C) | 15 | W/m·K |
| Coefficient of thermal expansion (20-100 °C) | 13 | µm/m·°C |
| Specific heat (20 °C) | 480 | J/kg·K |
| Magnetic response | Ferromagnetic (duplex) | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Iron | Fe | Balance | — | Base element |
| Chromium | Cr | 24.5 | 26.5 | Ferrite former; corrosion resistance |
| Nickel | Ni | 5.5 | 7.0 | Austenite former; phase balance |
| Molybdenum | Mo | 2.5 | 3.5 | Pitting + crevice resistance |
| Copper | Cu | 2.75 | 3.5 | Reducing-acid resistance |
| Nitrogen | N | 0.12 | 0.22 | Austenite former; strength; pitting |
| Manganese | Mn | — | 1.5 | Deoxidiser |
| Silicon | Si | — | 1.0 | Deoxidiser |
| Carbon | C | — | 0.030 | Low (intergranular resistance) |
| Phosphorus | P | — | 0.035 | Residual impurity |
| Sulphur | S | — | 0.025 | Residual impurity |
Solution-annealed (+AT) condition, per EN 10283 for W.Nr. 1.4517 (cast).
| Property | Value | Unit |
|---|---|---|
| Tensile strength (Rm) | >=650 | MPa |
| 0.2% proof strength (Rp0.2) | >=450 | MPa |
| Elongation at fracture | >=18 | % |
| Impact energy (KV, +20 °C) | >=50 | J |
| Brinell hardness | <=290 | HB |
Values per EN 10283 (cast); the minima are lower than the wrought 1.4507, as is normal for castings. Confirm against the inspection certificate (EN 10204).
| Environment | Performance | Notes |
|---|---|---|
| Chloride pitting | Outstanding | High Cr + Mo + N |
| Crevice corrosion | Outstanding | High-alloy duplex |
| Chloride SCC | Excellent | Duplex structure |
| Reducing acids (H2SO4, HCl) | Excellent | ~3% copper addition |
| Seawater | Excellent | Warm chlorinated seawater |
| Intergranular | Resistant | Low carbon |
A solid-solution cast alloy; it is not hardenable by heat treatment.
Solution Anneal approximately 1080-1120 °C, followed by rapid water quench to retain the balanced ferrite-austenite structure. Rapid cooling is critical owing to the high alloy content. Castings are normally supplied solution-annealed and quenched. Avoid prolonged exposure in the 300-1000 °C range (sigma-phase / 475 °C embrittlement).
Weldable for repair and fabrication using common fusion methods with a matching or over-alloyed super-duplex filler and controlled heat input.
| Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Good | Over-alloyed super-duplex filler |
| SMAW / stick | Good | Matching super-duplex electrode |
A post-weld solution anneal + quench is recommended for heavily welded castings to restore phase balance and corrosion resistance.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Machinability | Cast duplex; high strength; carbide tools, low speeds, rigid setup |
| Work hardening | Significant; positive feeds, avoid dwelling |
| Coolant | Ample flood coolant |
As a casting grade, primary shaping is by casting; machining is for finishing.
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Chemical processing | Cast pumps, valves, impellers | Reducing-acid resistance (Cu) |
| Marine / seawater | Cast fittings, housings | Warm chloride resistance |
| Oil & gas | Cast valve and pump bodies | Sour-service resistance |
| Desalination | Cast pump components | Hot chloride resistance |
| Product Form | Standard | Notes |
|---|---|---|
| Castings (general corrosion) | EN 10283 · W.Nr. 1.4517 | GX2CrNiMoCuN25-6-3-3 |
| Castings (pressure purposes) | EN 10213 · W.Nr. 1.4517 | — |
| Sour service | ISO 15156-3 | Acid-gas applications |
Cast copper-bearing 25Cr super duplex stainless steel (cast counterpart of 1.4507). W.Nr. 1.4517 (GX2CrNiMoCuN25-6-3-3); EN 10283 / EN 10213.
| EN Symbol | Type | Cr % | Mo % | Cu % | N % | Best Used For |
|---|---|---|---|---|---|---|
| GX2CrNiMoCuN25-6-3-3 | cast | 24.5-26.5 | 2.5-3.5 | 2.75-3.5 | 0.12-0.22 | Cast Cu-bearing super duplex |
| X2CrNiMoCuN25-6-3 | wrought | 24-26 | 3.0-4.0 | 1.0-2.5 | 0.20-0.30 | Wrought Cu-bearing super duplex |
| GX2CrNiMoN22-5-3 | cast | 21-23 | 2.5-3.5 | — | 0.12-0.20 | Cast standard duplex (2205) |
| X2CrNiMoN25-7-4 | wrought | 24-26 | 3.0-4.5 | — | 0.24-0.35 | 2507 super duplex |
| 1.4408 | cast | 18-20 | 2.0-2.5 | — | — | Cast CF8M (316-type) |
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