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
Alloy K-500 is an age-hardenable nickel–copper alloy that combines the excellent corrosion resistance of Monel 400 with significantly greater strength and hardness. This datasheet presents the material within the American (ASTM / SAE-AMS / UNS) standard system.
The increased strength is obtained by adding aluminium and titanium to the nickel-copper base and then heat-treating under controlled conditions, so that submicroscopic particles of Ni₃(Ti,Al) gamma-prime are precipitated throughout the matrix (age hardening). In the age-hardened condition it has approximately three times the yield strength and double the tensile strength of alloy 400, and can be strengthened further by cold working prior to precipitation hardening. It retains the chloride-stress-corrosion-cracking resistance and broad corrosion resistance of the Ni-Cu base — seawater and marine media, reducing acids, alkalis and salts — while remaining essentially non-magnetic and spark-resistant.
Strength is maintained to about 650 °C, and the alloy stays ductile and tough down to cryogenic temperatures with no ductile-to-brittle transition. Note that in the age-hardened condition it has a greater tendency toward stress-corrosion cracking in some environments than alloy 400. Typical applications include marine pump and propeller shafts, impellers, valve trim, fasteners and springs; oil-and-gas drill collars, non-magnetic housings and safety valves; and electronic components. It is listed in NACE MR0175 / ISO 15156 and MR0103 for sour service.
Values per manufacturer (Special Metals / VDM) data, solution-annealed and aged condition.
| Property | Value | Unit |
|---|---|---|
| Density | 8.46 | g/cm³ |
| Melting range | 1315–1350 | °C |
| Young's modulus (20 °C) | 180 | GPa |
| Specific heat capacity (20 °C) | 419 | J/kg·K |
| Thermal conductivity (20 °C) | 17.5 | W/m·K |
| Electrical resistivity (20 °C) | 0.615 | µΩ·m |
| Coefficient of thermal expansion (20–100 °C) | 13.7 | µm/m·°C |
| Magnetic permeability (20 °C) | ≤1.0015 | Essentially non-magnetic |
| Maximum service temperature | ~650 | °C |
Limiting composition per ASTM B865 (UNS N05500).
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel (+ Cobalt) | Ni | 63.0 | — | Base element; corrosion resistance (typ. ~65%) |
| Copper | Cu | 27.0 | 33.0 | Primary alloying element; reducing-acid + seawater resistance |
| Aluminium | Al | 2.3 | 3.15 | γ′ Ni₃(Ti,Al) former; age-hardening |
| Titanium | Ti | 0.35 | 0.85 | γ′ former; age-hardening |
| Iron | Fe | — | 2.0 | Residual |
| Manganese | Mn | — | 1.5 | Deoxidiser |
| Carbon | C | — | 0.18 | Controlled |
| Silicon | Si | — | 0.5 | Deoxidiser |
| Sulphur | S | — | 0.006 | Residual impurity |
Note: a precipitation-hardenable Ni-Cu alloy; the aluminium + titanium additions form the strengthening γ′ phase while the Ni-Cu base retains the corrosion resistance of alloy 400.
Typical room-temperature properties, solution-annealed and aged condition.
| Property | Value | Source |
|---|---|---|
| Ultimate tensile strength | 900–1100 MPa | Solution-treated + aged |
| 0.2% proof strength (yield) | 600–790 MPa | Solution-treated + aged |
| Elongation at break | 20–30 % | Solution-treated + aged |
| Hardness | ~250–350 HB | Solution-treated + aged |
In the age-hardened condition the alloy has roughly three times the yield strength and double the tensile strength of alloy 400, and can be further strengthened by cold work before aging. It retains good toughness to cryogenic temperatures. Values are typical; confirm against the mill test certificate for each delivery.
| Environment | Performance | Notes |
|---|---|---|
| Seawater / brackish water | Outstanding | Retains alloy-400 marine resistance; high-velocity capable |
| Reducing acids (sulphuric/hydrochloric) | Very Good | Non-oxidising conditions |
| Alkalis / salts | Excellent | Broad resistance |
| Hydrofluoric acid | Very Good | Like alloy 400 |
| Chloride stress-corrosion cracking | Good | Resistant, but less so than alloy 400 when age-hardened |
| Sour service (H₂S) | Good | NACE MR0175 / MR0103 (QQ-N-286) |
| Cavitation / erosion | Excellent | High strength + hardness |
| Oxidising media (nitric acid) | Poor | No chromium — avoid |
A precipitation-hardening nickel–copper alloy. Strength is developed by solution treatment followed by age hardening.
Solution Anneal Temperature: ~980 °C (1800 °F), followed by appropriate cooling
Age Hardening Temperature: ~595 °C (1100 °F) with controlled hold and furnace cooling (multi-step cycle depending on section) Purpose: precipitates Ni₃(Ti,Al) γ′ for high strength and hardness.
Welding note: the alloy should be welded in the annealed (non-aged) condition; the weldment should then be stress-relieved/solution-treated and aged to develop full properties. Cold work before aging further raises strength.
Weldable, but as a γ′-strengthening alloy it should be welded in the solution-annealed (non-aged) condition to avoid cracking; the weldment is then heat-treated and aged to develop full strength.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG · GMAW / MIG | Good (annealed condition) | AWS A5.14 ERNiCu-7-type (Monel-type filler) |
| SMAW / stick | Good | AWS A5.11 ENiCu-7-type electrode |
Anneal welded assemblies and stress-relieve before aging. Keep joints clean and free of contaminants.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Preferred condition | Machine in solution-annealed condition before final aging where possible |
| Work hardening | High rate; rigid setup, sharp tooling, positive rake |
| Coolant | Ample flood coolant |
Forming Processes
| Process | Notes |
|---|---|
| Hot forming | Standard hot-working practice; solution anneal afterwards |
| Cold forming | In solution-annealed condition; cold work before aging raises strength |
| Final aging | After forming/machining to develop full strength |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Marine / offshore | Pump and propeller shafts, impellers, valve trim, fasteners, chains | High strength + seawater resistance |
| Oil and gas | Drill collars, non-magnetic housings, safety valves, instruments | Strength + non-magnetic + sour service |
| Chemical processing | Pump and valve components | Corrosion resistance + strength |
| Paper / pulp | Doctor blades, scrapers | Strength + corrosion + wear resistance |
| Springs / fasteners | Marine springs, high-strength bolting | Strength + corrosion fatigue resistance |
| Electronics | Sensors, non-magnetic components | Non-magnetic + corrosion resistance |
| Product Form | ASTM Standard | AMS / Other |
|---|---|---|
| Rod, bar and forgings | ASTM B865 | AMS 4676 · QQ-N-286 |
| Wire | ASTM B865-related | — |
| Plate, sheet and strip | ASTM B865-related | — |
| Fasteners | ASTM F467 / F468 | — |
| Welding consumables | AWS A5.14 ERNiCu-7-type (annealed-condition welding) | — |
Listed in NACE MR0175 / ISO 15156 and MR0103 for sour service; QQ-N-286. UNS N05500.
| Alloy | Ni % | Key Element | Type | Best Used For |
|---|---|---|---|---|
| Alloy K-500 | 63–70 | Cu 27–33 | Age-hardened Ni-Cu (Al+Ti) | Marine high-strength; non-magnetic |
| Alloy 400 | 63–70 | Cu 28–34 | Solid-solution Ni-Cu | Seawater, HF, reducing acids |
| Alloy 200 | ≥99.0 | — | Commercially pure Ni | Caustic/alkali; conductivity |
| Alloy X-750 | ≥70 | Cr 14–17 | Age-hardened Ni-Cr | Springs/high-temp to 700°C |
| Alloy 718 | 50–55 | Cr 17–21 | Age-hardened Ni-Cr-Fe | Highest strength; turbine to 650°C |
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