UGI® KC35N Cold Drawn and Aged

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Description

UGI® KC35N is an non magnetic nickel- cobalt- chromium-molybdenum alloy of the multiphase alloy system that possesses an outstanding combination of ultra high tensile strength, good ductility and toughness, and excellent corrosion resistance. In addition, this alloy display exceptional resistance to sulfidation , high tempera-ture oxidation , hydrogen embrittlement


UGI® KC35N can be produced to answer specific requirements. It is possible to manufacture this alloy in a large range of nominal values mechanical properties from annealed temper (UTS : 800 – 1000 MPa) up to cold drawn condition (tensile running from 1300 MPa to 2000 MPa) within a range of +/- 100 MPa.


The influence of the heat treatment, negligible in the annealed condition, becomes more important as the cold drawn hard-ening increases. However, even if the level of the request mechanical resistance can be reached only by cold drawing, it is preferable to use lighter cold drawing temper and achieve the requested mechanical properties after heat treatment; the heat treatment stabilizing the material.

Related Standards

Equivalent Materials

This material data has been provided by Ugitech SA.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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Properties

General

PropertyTemperatureValue

Density

23.0 °C

8.34 g/cm³

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Mechanical

PropertyTemperatureValue

Elastic modulus

20.0 °C

235 GPa

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200.0 °C

219 GPa

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500.0 °C

201 GPa

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Shear modulus

20.0 °C

80.9 GPa

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200.0 °C

74.7 GPa

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500.0 °C

67.8 GPa

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Tensile strength

23.0 °C

1300 - 2000 MPa

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Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100.0 °C

1.28E-5 1/K

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for 0 to mentioned temperature

Melting point

1315 - 1440 °C

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Thermal conductivity

23.0 °C

11.24 W/(m·K)

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Electrical

PropertyTemperatureValue

Electrical resistivity

23.0 °C

1.03E-8 Ω·m

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Magnetic

PropertyTemperatureValueComment

Relative magnetic permeability

23.0 °C

1 [-]

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max., 500 / 1000 Oe

Chemical properties

PropertyValueComment

Boron

0.01 %

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Carbon

0.03 %

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max.

Chromium

19 - 21 %

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Cobalt

Balance

Iron

1 %

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max.

Manganese

0.15 %

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Molybdenum

9 - 10.5 %

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Nickel

33 - 37 %

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Phosphorus

0.02 %

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max.

Silicon

0.15 %

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Sulfur

0.01 %

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max.

Titanium

1 %

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max.

Technological properties

Property
Application areas

  • Medical: prothesis et fixation screws, pacemaker’s electrodes, vascular stent, veina cava filter, orthodonty, ancil-lary…
  • Aerospace industries springs torsion bar, gyroscopes’s parts
  • Naval equipment: fittings, springs and cables
  • Watches Industry: springs, parts of wrist-watch strap , pins, crown, push button’s springs
  • Electronic’s industry : non magnetic parts
  • Force and pressure sensors
  • Oil and gas industry: springs ,non magnetic parts, corrosion and abrasion resistant parts

  • Corrosion properties

    UGI® KC35N possesses excellent resistance to sulfidation, high temperature oxidation, hydrogen embrittlement, saline so-lutions and most mineral acids. It’s features exceptional resistance to stress corrosion cracking at very high strength level under severe environmental conditions that can crack most conventional alloys. It is also highly resistant to other forms of localized attack, such as pitting and crevice corrosion.


    As UGI® KC35N is a an extremely noble alloy , this can result in galvanic corrosion when electrically coupled with more active metals such as carbon steel, type 316 stainless, or K MONEL®.


    UGI® KC35N alloy is included in NACE MR0175 to a maximum hardness of Rockwell HRC 35 (maximum hardness of Rockwell HRC 48 in specific cold reduced plus aged condition). This material requirements lists sulfide stress cracking resistant materials for exposure to sour environment, such as in gas and oil well service.


    MediaLevel
    Acetic acid
    Sulfuric acid
    Sea water
    Humidity
    Salt spray (NaCl)
    Nitric acid
    Phosphoric acid
    Sodium hydroxide
    Excellent
    Good
    Excellent
    Excellent
    Excellent
    Good
    Good
    Good

    General machinability

    The high mechanical properties in the as drawn condition and the ability of cold hardening during machining, need to take particular precautions for machining:

  • Robust and rigid machines
  • moderate Cutting speeds
  • Carbides tools, or brazed pastilles, with large rake angles
  • Cutting fluid with high performances of cooling and lubrication


    Machinability studies have shown that this alloy possesses machining characteristics superior to those of Waspaloy®, a widely used standard for Nickel-Cobalt-Chromium bas alloy machinability. Machining parameters for UGI® KC35N are similar those used for Waspaloy® alloy

  • Heat Treatment

    UGI® KC35N can be aged in the temperature range of 430 / 650 °C /Air cool

    For optimum properties, cold worked KC35N alloy should ne aged @ 540 – 600 °C

    The influence of the treatment on annealed material is negligible but become very important on cold drawn products

    Welding

    UGI® KC35N alloy can be successfully TIG welded. In general, welding properties are similar to those of type 304 stain-less. Similar preparations and precautions should be employed.


    The welding parameters should be adjusted to ensure that the heat input per pass is low. Approximately 1/2 to 2/3 of the heat input used to weld maraging steel and type 304 stainless steel should be used.