Cobalt base alloy Phynox alloy UNS R30003, R30008 for medical

Cobalt base alloy Phynox alloy (UNS R30003, R30008) wire, strip, tube and bar for surgical implant

1 PRODUCT

Solution heat treated cold drawn and aged cobalt base alloy Phynox alloy.

Product forms available as wire, strip, tube, bar and rod etc.

2 EQUIVALENT DESIGNATION

UNS R30003, R30008, AWS 100, W.NR 2.4711, Elgiloy, Conichrome, K13C20N16Fe15D07(AFNOR)

3 OVERVIEW

Phynox is an austenitic cobalt based alloy strengthened by cold work and capable of additional hardening by aging at a moderate temperature (around 500°C).

In the fully hardened condition, its elastic modulus is around 210000 MPa, with UTS levels up to 2500 MPa on cold rolled strip.

In addition to its very high yield strength, Phynox offers a range of physical chemical and technological properties that make it appropriate for a wide variety of applications.

The most important complementary properties are

● Exceptional resistance to corrosion, stress corrosion cracking and hydrogen embtittlement.

● Good fatigue strength.

● The absence of aging in service.

● The absence of magnetism.

● Ability to be used over a wide range of temperatures, from liquid helium to about 500て

● Perfect passivity in contact with human tissues.

● The possibility of increasing the strength of parts by age hardening after forming, leading to strength levels unattainable with other materials

● The absence of brittleness at low temperatures (no transition temperature).

● A maximum service temperature about 100oC higher than for stainless steels.

● A corrosion resistance vastly superior to that of molybdenum-containing stainless steels

● A very high yield strength that combined with a high elastic modulus in both tension and torsion, enables the storage and rapid release of large amounts of elastic energy.

4 APPLICATION

Phynox often provides the best solution whenever high mechanical performance is required under severely corrosive service conditions.

Phynox finds numerous applications in

Spring for watch motors

Shaped springs(helical etc)

Flexible coupling

Electrical and electronic apparatus

Petrochemical

Oil-gas

Aeronautical engineering

Automotive injection system

Various diaphragms

Naval equipment

Weaponry

Prostheses for osteosynthesis

Pacemaker electrodes

Special collars for missiles

Automotive ABS systems

Surgical implants and medical instruments

Printer springs

5 CHEMICAL COMPOSITION (wt%):

6 PHYSICAL PROPERTY

Density: 8.3 g/cm³ (0.300lb/in³)

Melting range: 1450-1460°C (2642-2660°F)

Modulus of rigidity: 77 kN/mm²(11168ksi)

Elasticity modulus: 203.4 kN/mm² (29501 ksi)

Electrical resistivity at 20°C: 95.0 uΩ.cm

Variation of resistivity with temperature between 0 and 300°C: annealed condition: 4x 10^-4 uΩ.cm°C^-1

Variation of resistivity with temperature between 0 and 300°C: cold work condition: 4.3x 10^-4 uΩ.cm°C^-1

Specific Heat at 68-212˚F (20-100˚C) : 450 J.kg^-1.°C^-1

Thermal Conductivity: 12.5W.m^-1.°C^-1

Magnetism: Non-magnetic

Coefficient of thermal expansion at 70-212˚F (20-100˚C) : 12.5 um/m°C (7x10⁶ in/in°F)

Young’s modulus between 0-50°C: -400x10^-6 MPa.°C^-1

7 CORROSION RESISTANCE

Phynox is not sensitive to corrosion by organic acids and shows perfect resistance in salt spray tests. Its behaviour in inorganic acids is greatly superior to that of the best stainless steels.

Furthermore, because of its remarkable passivity in contact with human tissues, Phynox is used for artificial bone implants (cast and wrought prostheses).

8 MECHANICAL PROPERTIES

Typial mechanical properties

Annealed condition

Softening is achieved by annealing at 1050°C for at least 30 minutes followed by rapid cooling, for example in air. The typical mechanical properties are given in the table below.

9 HEAT TREATMENT

Annealing

Phynox cannot be hardened under annealing conditions. Softening is achieved by annealing at 1050°C for at least 30 minutes followed by rapid cooling, for example in air.

Spring temper

Store for 5 hours at 520°C (970°F) and use air cooling to eliminate stress

Aging

The standard final aging treatment is 3 hours at 520°C.

Heat treatment in air does not modify the mechanical properties, but impairs the appearance, the metal taking on a pale yellow tinge. Treatments under a vacuum of the order of 10-5 torr or in a neutral atmosphere (e.g, argon) are recommended.

Some atmospheres that are considered to be inert based only on the absence of visible colouring after heat treatment must be used with care. In particular, this is the case for hydrogen atmospheres, which are not recommended, although in certain cases, the properties can be restored by subsequent baking.

10 MACHINING AND FORMING

The mechanical properties in the annealed delivery condition are similar to those of other austenitic alloys.

Machining should preferably be performed with carbide tools, since Phynox work hardens strongly. A moderate cutting speed should be used, with large rake angles.

Many common machining and forming operations can be carried out in the cold worked condition. In particular, the simple winding of a spring can be carried out for strain levels of up to 85%. For more complex shaping operations, moderate cold reductions should be chosen.

Phynox can be electrochemically machined, certain companies being specialized in this technique.

11 STANDARD SPECIFICATION

AMS 5833

AMS 5834

AMS 5875

AMS 5876

ASTM F1058

ISO 5832-7

NACE MR0175

ISO15156-3

12 COMPETITIVE ADVANTAGE

(1)More than 50 years experience of research and develop in high temperature alloy, corrosion resistance alloy, precision alloy, refractory alloy, rare metal and precious metal material and products.
(2) 6 state key laboratories and calibration center.
(3) Innovative and patent technologies.

(4) High performances

13 BUSINESS TERM