Phynox

Material

Phynox, UNS R30003, R30008, 2.4711, 40Co20Cr16Fe15Ni7Mo, 3J21
Note that Phynox is a registered trade mark of Aperam Alloys Imphy.

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
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).

Available Process

Cold worked and bright annealed

Cold worked, bright annealed, polished (MP, EP etc.)

Common Tests

  • ◎ Chemical composition
  • ◎ Tension
  • ◎ Hardness
  • ◎ Flaring
  • ◎ Flange
  • ◎ Flattening
  • ◎ Micro structure
  • ◎ Hydrostatic
  • ◎ NDT
  • ◎ Intergranular Corrosion
  • ◎ Surface condition
  • ◎ Shape and dimension
  • ◎ Positive Material Identification

Product forms

Capillary tube

  • ◎ OD 0.30 ~ 3.0 mm
  • ◎ WT 0.05 ~ 0.5 mm

Precision seamless tube

  • ◎ OD 3.0 ~ 89 mm
  • ◎ WT 0.10 ~ 10.0 mm

HP / UHP BA+ tube

  • ◎ OD 3.0 ~ 76 mm
  • ◎ WT 0.10 ~ 10.0 mm

Service

  • ◎ Precision cutting
  • ◎ Tube surface treatment, like ID surface super mirror polishing, best level could reach Ra0.0015um
  • ◎ Tube deep processing, like coiling, bending, end forming, body forming, laser processing, various needles processing, built to drawing and sample, etc.