Phynox, Alloy, Precision Alloy

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.

Characteristics

◇ 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.

Application

Phynox often provides the best solution whenever high mechanical performance is required under severely corrosive service conditions. It is mainly used for wear resistance, corrosion resistance, knock resistance, no magnetic, high strength aviation elastic components. It is also used for making products requiring high corrosion resistance and non-magnetic properties.

Chemical Composition (wt%)

Material	Fe	Ni	Cr	Co	Mo	C	Mn	Si	P	S	Be
Phynox	Bal.	15.0-17.0	19.0-21.0	39.0-41.0	6.0-8.0
R30003	Bal.	14.0-16.0	19.0-21.0	39.0-41.0	6.0-8.0	≤0.15	1.5-2.5	≤1.20	≤0.015	≤0.015	≤0.10
R30008	Bal.	15.0-18.0	18.5-21.5	39.0-42.0	6.5-7.5	≤0.15	1.0-2.0	≤1.20	≤0.015	≤0.015	≤0.001

Typical Mechanical Properties

Condition	Tensile strength		Yield strength		Elongation
Condition	N/mm²	ksi	N/mm²	ksi	%
Annealed	≥850	≥123	≥450	≥65	≥40
Cold worked	≥1200	≥174	≥900	≥130	≥10

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).

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.

Hardness of annealed: 240 HV max.

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.

Product Forms

Form	Size range
Capillary tube	OD 0.08 ~ 6.0 mm WT 0.015 ~ 1.5 mm
Thin wall & Ultra thin wall seamless tube	OD6.0~80.0 mm WT 0.05~4.5 mm
Micro ID and heavythick wall seamless tube	OD3.0~50.0 mm ID0.30~5.0mm
Precision conic seamless tube	Bigger end: OD3.0 - 426.0mm Smaller end: OD2.5 - 346.0mm WT: 0.15 - 40.0mm
HP/UHP BA+ tube EP tube	OD 1.0 ~ 76 mm WT 0.10 ~ 10.0 mm
Small caliber precision seamless tube	OD6.0 ~89mm WT 0.50 ~9.0 mm
Profiled seamless tube	Build to drawing Build to specification
Bourdon tube	Y40, Y50, Y60, Y70, Y100, Y150