UNS R30003 Material CoCrNiMo Alloy Cold Rolled Strip Mirror Finish for Diaphragm Valve Application

UNS R30003 Material CoCrNiMo Alloy Cold Rolled Strip Mirror Finish for Diaphragm Valve Application

R30003 is an non-magnetic austenitic 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 210 000 MPa, with UTS levels up to 2500 MPa on cold rolled strip. In addition to its very high yield strength, R30003 offers a range of physical, chemical and technological properties that make it appropriate for a wide variety of applications.

Chemical composition(%, wt)

• C: 0.15 max.
• Mn: 1.5-2.5
• Si: 1.2 max.
• P: 0.015 max.
• S: 0.015 max.
• Cr: 19.0-21.0
• Ni: 14.0-16.0
• Co: 39.0-41.0
• Mo: 6.0-8.0
• Be: 0.1 max.
• Fe: remainder

Specifications

• ASTM F1058
• AMS 5876
• Nace MR 0175
• UNS R30003
• Nr 2.4711
• Elgiloy
• Phynox

Characters of R30003

• Exceptional resistance to corrosion, stress corrosion cracking and hydrogen embrtittlement.
• Good fatigue stregth.
• 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°C.
• 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 100°C 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.

Applications

• Aeronautical and aerospace equipment
• Diaphragm Valve
• Automotive ABS systems
• Automotive injection systems
• Electrical and electronic apparatus
• Equipment for the chemicals and oil & gas industries
• Flexible coupling
• Pacemaker electrodes
• Printer springs
• Prostheses for osteosynthesis
• Shaped springs (helical, etc…)
• Surgical implants and medical instruments
• Various diaphragms

Technological properties

Machinig 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.

R30003 can be electrochemically machined, certain companies being specialized in this technique.

Welding and Brazing

R30003 can be readily welded, in particular by resistance spot welding, by electron beam welding and by argon arc welding. It can also be brazed. However, since age hardening can only be obtained in cold worked regions, this must be taken into account by placing the weld or braze joint in positions where it is not heavily loaded, or by using a discontinuous joint.

Pickling

Apart from mechanical descaling, the oxide film formed during heating in air can be removed by immersing the parts in a boiling aqueous solution containing 5% hydrofluoric acid and 12% nitric

acid.

Available Forms at XUNSHI

R30003 is delivered in the form of cold rolled strip, cold drawn wire, hot forged round bar.

Cold rolled strip: thickness 0.01~2.0mm, width 1~220mm.

Cold drawn wire: diameter 0.20~5.0mm, in coil, in reel or in cut length.

Hot forged round bar: diameter 30mm~500mm, black finish or rough machined.