UGI® KC35N Annealed

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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.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
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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8.34 g/cm³

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Elastic modulus

20 °C

233 GPa

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200 °C

216 GPa

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500 °C

201 GPa

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Shear modulus

20 °C

83.4 GPa

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200 °C

77.8 GPa

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500 °C

70.6 GPa

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Tensile strength

800.0 - 1000.0 MPa

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Coefficient of thermal expansion

0.0000128 1/K

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20 to 100°C

Melting point

1315.0 - 1440.0 °C

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Thermal conductivity

11.24 W/(m·K)

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Electrical resistivity

1.0300000000000001e-08 Ω·m

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Relative magnetic permeability

1.0009 [-]

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max., 500 / 1000 Oe

Chemical properties



0.01 %

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19.0 - 21.0 %

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9.0 - 10.5 %

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33.0 - 37.0 %

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Technological properties

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.

    Acetic acid
    Sulfuric acid
    Sea water
    Salt spray (NaCl)
    Nitric acid
    Phosphoric acid
    Sodium hydroxide

    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


    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.