Characteristics

  • High mechanical strength
  • High toughness and ductility
  • High hardness
  • Outstanding resistance to sea water corrosion, both general and pitting corrosion
  • Lack of selective phase attack
  • Immune to hydrogen embrittlement and stress corrosion cracking in sea-water
  • Anti-bio-fouling (lack of marine growth)
  • High resistance to impingement/erosion/cavitation/pitting in sea-water
  • Good resistance to stress corrosion cracking in hydrogen sulphide conditions
  • Good anti-galling resistance against stainless steel
  • High modulus of elasticity compared with other copper-based alloys
  • No loss of properties at cryogenic temperatures
  • Low relative magnetic permeability – virtually non-magnetic
  • Easily machined to a high surface finish and dimensionally stable
  • Non-sparking
  • Uniform fine grain structure permits volumetric inspection using ultrasonic techniques
  • Cost-effective

Download CAL T-850 Datasheet

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
  • CuNi15Mn4Al1Fe

Table 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

* For reference only – does not form part of the acceptance criteria unless agreed.

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.

View Corrosion Data

Physical Properties

  • High Strength Copper-Nickel-Manganese-Aluminium Alloy
  • CuNi15Mn4Al1Fe

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

Additional information can be provided upon request.

Applications

Marine applications requiring extreme strength and high hardness coupled with excellent marine corrosion resistance combined with low magnetic permeability and anti-galling properties against stainless steel. Valve and pump bodies including internal components (stems/shafts/balls/seals). Actuators, pressure housings, clamps and fasteners, bushings, bearings and sonar equipment. The material’s ability to resist bio-fouling (lack of marine growth) is another important feature of this alloy.

Aerospace components, such as landing gear bushings, sleeves and highly stressed aero frame parts, refuelling connectors, noting its non-sparking properties.

Maximum service temperature ≈ 250°C / 482°F (long term) ≈ 280°C / 536°F (short term exposure); above these temperatures the material weakens and becomes less ductile.

 

Inspection and Certification

    • High Strength Copper-Nickel-Manganese-Aluminium Alloy
    • CuNi15Mn4Al1Fe

 

Product form
Bars Forgings
Grade / Class
Grade 1 Grade 2 Class 1 Class 2 Class 3
Chemical Analysis (melt) Every cast Every cast Every cast Every cast Every cast
*Mechanical Testing *Every cast for each size
Integral sample
*Every cast for each size
Integral sample
*Each and every forging
Integral sample
*One forging every cast/size
Integral sample
*Separate forged test bar each cast
Ultrasonic Inspection 100% Def Stan 02-729 part 5 100% Def Stan 02-729 part 5 100% Def Stan 02-729 part 5
Dye Penetrant Inspection 100% Def Stan 02-729 part 4 100% Def Stan 02-729 part 4
Visual Inspection 100% 100% 100% 100% 100%

* For all grades and classes, except class 3, test samples are integral to the item and the property results are therefore fully representative of the certified material.

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Forms Available

We can provide the largest and heaviest-section forged products available anywhere due to industry-leading large ingot sizes that ensure a large total forging reduction and a uniform fine-grain wrought structure in the finished product.

Our capacity continues to evolve and widen as we service ever-increasing customer demands.

  • Bars (square / flat / round) from 10mm to 500mm (0.375″-20″) in section
  • Forgings (to 5 Tonnes): Blocks/Rings to 2400mm (8ft) outer ø / Shafts to 7M (23ft) long / Discs to 1250mm (50″) ø
  • Proof machined or fully machined components

Composition

  • Complies with Def Stan 02-835 Part 2
  • High Strength Cupper-Nickel-Manganese-Aluminium Alloy
  • CuNi15Mn4Al1Fe

 

Table 1 – Composition requirements (main elements) weight %

 

Cu Ni Al Fe Mn
Remainder 13.5 – 16.5 1.0 – 2.0 0.7 – 1.2 3.5 – 5.5

We exercise precise control over alloy composition and using our advanced melting and casting techniques, we produce high quality ingots and slabs for converting into a extensive variety of wrought products.

Our highly calibrated laboratory ensures that we are fully compliant with material composition requirements. Traceability from source to customer is guaranteed.

Contact

+44 (0) 1782 816888

[email protected]

Auckland Street, Stoke-on-Trent, ST6 2AZ, United Kingdom