CERTIFICATIONS
High Strength Wrought Copper-Nickel-Manganese-Aluminium alloy CuNi15Mn4Al1Fe (Compliant with generic alloy Def Stan 02-835 Part 2).
High strength and hardness combined with high toughness and good ductility.
Background
This high strength wrought cupro nickel alloy is used in a variety of marine applications including the oil and gas industry, but primarily the defence sector, for its outstanding corrosion resistance combined with high strength and toughness with good ductility. The high impact strength make it particularly useful in Naval Engineering applications where resistance to Naval-Shock is required, combined with high strength and resistance to marine corrosion.
The CAL T-850 is also resistant to wear, has a low magnetic permeability, resists galling against stainless steel and does not suffer from marine growth or hydrogen embrittlement. The main strengthening mechanism involves the precipitation of an extremely fine nickel-aluminium Ni3Al phase. The aluminium content of this alloy is lower than our Extreme Strength Cupro Nickel T-1000 and therefore less precipitate is formed, producing a material with higher toughness at the expense of strength and hardness.
Our deep metallurgical understanding of this mechanism combined with our advanced manufacturing techniques enables us to balance the mechanical properties inducing high strength together with high toughness and good ductility.
Mechanical Properties
Complies fully with NES / Def Stan 02-835 Part 2
High Strength Copper-Nickel-Manganese-Aluminium Alloy
CuNi15Mn4Al1FeTable 2 - Guaranteed Minimum Mechanical Properties
| Product → |
Bars - Round, square, flats, hexagon, shapes | Forgings | ||
|---|---|---|---|---|
| Material section-size (minor dimension) | All sizes | |||
| Property ↓ |
Below 15mm | Over 15mm to 125mm | Over 125mm | |
| Ultimate Tensile Strength Rm MPa | 725 (105Ksi) |
725 (105Ksi) |
710 (103Ksi) |
710 (103Ksi) |
| 0.2% Proof Stress Rp0.2 MPa | 430 (62Ksi) |
430 (62Ksi) |
400 (58Ksi) |
400 (58Ksi) |
| % Elongation after Fracture 5.65 √ So % | 18 | 18 | 18 | 18 |
| Impact J | N/A | 40 (30ft lbf) |
40 (30ft lbf) |
40 (30ft lbf) |
| *Typical Hardness Brinell HB 10/3000 | 210-240 | 210-240 | 210-240 | 210-240 |
Corrosion Data
A tenacious oxide film at the surface - progressively thickening over time offering increased protection - makes this material highly resistant to attack in atmospheric and sea water environments, including polluted and brackish water.
The CAL T-850 is highly resistant to pitting and crevice corrosion which is common in multi-phase alloys and stainless steels. Its natural features make it highly resistant to bio-fouling (attachment by micro/macrofoulers e.g. seagrasses and molluscs living in the seawater) which causes accelerated corrosion and reduced functionality.
Table 3 - Surface Corrosion Data - Seawater
| CAL Elite Marine Alloys | Other commonly used Marine-Alloys (also offered by CAL) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Material | Extreme Strength Cupro Nickel | High Strength Copper-Nickel-Manganese-Aluminium Alloy | Wrought Copper-Nickel-Chrome (CNC) Alloy | Wrought Nickel Aluminium Bronze (NAB) | 70/30 Cupro Nickel | 90/10 Cupro Nickel | Naval Brass | Nickel-Copper Alloy | Nickel-Copper-Aluminium-Titanium Alloy | Stainless Steel | Stainless Steel |
| Base composition | CuAl14Al2 | CuNi15Mn4 Al1Fe |
CuNi30Cr1 MnFeSiZrTi |
CuAl9Ni5 Fe4 |
CuNi30Mn1 Fe |
CuNi30Mn1 Fe |
CuZn37Sn1 | NiCu30Fe2 Mn1 |
NiCu30Al3 Fe1MnTi |
FeCr18Ni9 | FeCr18Ni12 Mo2 |
| Specification → Property ↓ |
(DIN 2.1504) |
(Def Stan 02-835) |
(Def Stan 02-824) | Def Stan (NES) 833 / CW307G | Def Stan (NES) 780 / CN107 / C71500 / CW354H | Def Stan (NES) 779 / CN102 / C70600 / CW352H | CZ112 / CW712R / C46400 | NA13 / UNS N04400 | NA18 / UNS N05500 | 304 stainless | 316 stainless |
| General corrosion rate mm/year | 0.02mm / 0.0008" | 0.025mm / 0.001" | 0.02mm / 0.0008" | 0.025-0.05mm / 0.001-0.002" | 0.03mm / 0.001" | 0.03mm / 0.001" | 0.05mm / 0.002" (4 x at 60℃) | 0.03mm / 0.001" | 0.03mm / 0.001" | 0.025mm / 0.001" | 0.025mm / 0.001" |
| Crevice corrosion rate mm/year | <0.02mm / 0.0008" | <0.025mm / 0.001" | <0.02mm / 0.0008" | 0.5-1.0mm / 0.002-0.004" |
0.025-0.13mm / 0.001-0.005" | 0.025-0.13mm / 0.001-0.005" | 0.15mm / 0.006" | 0.5mm / 0.020" | 0.05mm / 0.002" | 0.25mm / 0.010" | >0.13mm / 0.005" |
| Selective Phase Corrosion mm/year | None | None | None | 0.5-1.0mm / 0.002-0.004" |
None | None | Yes 0.15mm / 0.006" | None | None | None | None |
| Impingement resistance limit m/second | 3.7 (12ft/sec.) | 3.7 (12ft/sec.) | 6-8 (20-26ft/sec.) | 4.3 (14ft/sec.) | 4.6 (15ft/sec.) | 3.7 (12ft/sec.) | 3.05 (10ft/sec.) | >9.1 (>30ft/sec.) | >9.1 (>30ft/sec.) | >9.1 (>30ft/sec.) | >9.1 (>30ft/sec.) |
| Corrosion Potential in Seawater Vsce | -0.18 | -0.19 | -0.18 | -0.19 | -0.18 | -0.20 | -0.24 | -0.12 | -0.12 | -0.08 | -0.08 |
| Marine bio-fouling resistance | Highly resistant | Highly resistant | Highly resistant | Partially resistant | Resistant | Highly resistant | Partially resistant | Not resistant | Not resistant | Not resistant | Not resistant |
| Cast Def Stan 02-747 | |
|---|---|
| General corrosion rate | 0.07mm (0.002") / year |
| Crevice corrosion rate | 0.05mm (0.002") / year |
| Selective Phase Corrosion | 1.1mm (0.04") / year typical 1.4mm (0.055") / year observed |
Table 4 - Physical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Melting point | 1,040-1,080°C | 1,904-1,976°F |
| Density | 8,530 kg/m³ | 0.3080 lbs/in³ |
| Specific Heat | 0.435 J/(g.°K) | 0.104 Btu/(lb.°F) |
| Thermal Conductivity @ 20°C | 25 W/(m.°K) | 14.4 Btu/(Hour.Ft.°F) |
| Electrical Conductivity %IACS at 20°C | 5 | 5 |
| Electrical Resistivity at 20°C | 0.35 μ.Ω.m | 13.8 μ.Ω.in |
| Magnetic Permeability (μr) | ||
| Coefficient of linear expansion (20-100°C) | 16.0 x 10-6/°C | 8.89 x 10-6/°F |
| Coefficient of linear expansion (20-200°C) | 12.0 x 10-6/°C | 6.67 x 10-6/°F |
| Coefficient of static friction against mild steel | 0.22 | 0.22 |
| Young's Modulus, Modulus of Elasticity | 145,000 N/mm² | 21,031 ksi |
| Compressive Strength σdB | 2,350 N/mm² | 340.8 ksi |
| Poisson's Ratio | 0.33 | 0.33 |
| Fatigue 108 cycles | 232 N/mm² | 33.65 ksi |
United Kingdom