UGI® HT286 Annealed and Aged

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Description

UGI® HT286 is an austenitic iron-base alloy containing nickel, chromium, molybdenum and titanium. The titanium and small amount of aluminium it contains enables the alloy to be strengthened by precipitation of the Ni3 (Ti,Al) gamma prime phase, providing good mechanical properties from cryogenic temperatures up to 700°C.

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.

Ashby charts

Properties

General

PropertyTemperatureValue

Density

23.0 °C

8 g/cm³

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Mechanical

PropertyTemperatureValueComment

Elongation

23.0 °C

15 %

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min.

Tensile strength

23.0 °C

900 - 1150 MPa

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Yield strength

20.0 °C

600 MPa

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min., EN 10269

50.0 °C

592 MPa

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min., EN 10269

100.0 °C

580 MPa

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min., EN 10269

150.0 °C

570 MPa

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min., EN 10269

200.0 °C

560 MPa

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min., EN 10269

250.0 °C

550 MPa

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min., EN 10269

300.0 °C

540 MPa

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min., EN 10269

350.0 °C

530 MPa

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min., EN 10269

400.0 °C

520 MPa

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min., EN 10269

450.0 °C

510 MPa

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min., EN 10269

500.0 °C

490 MPa

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min., EN 10269

550.0 °C

460 MPa

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min., EN 10269

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100.0 °C

1.65E-5 1/K

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for 20 to mentioned temperature

Melting point

1370 - 1400 °C

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Thermal conductivity

23.0 °C

14 W/(m·K)

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Electrical

PropertyTemperatureValue

Electrical resistivity

23.0 °C

9.1E-7 Ω·m

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Chemical properties

PropertyValueComment

Aluminium

0.35 %

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max.

Boron

0.03 - 0.1 %

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Carbon

0.08 %

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max.

Chromium

13.5 - 16 %

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Iron

Balance

Manganese

1 - 2 %

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Molybdenum

1 - 1.5 %

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Nickel

24 - 27 %

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Phosphorus

0.03 %

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max.

Silicon

1 %

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max.

Sulfur

0.015 %

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min.

Titanium

1.9 - 2.3 %

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Vanadium

0.1 - 0.5 %

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Technological properties

Property
Application areas

  • Fasteners (screws, bolts, studs) for high-temperature environments in the aerospace and automotive industries
  • Springs
  • Non-magnetic cryogenic parts
  • Blades

  • Corrosion properties

    UGI® HT286 has an oxidation resistance comparable to that of type AISI 310 stainless steel, up to 800°C. The corrosion resistance of this alloy is excellent up to 700°C in many atmospheres encountered in jet engine services. Its good resistance to high-temperature oxidation and intergranular corrosion, together with its absence of cobalt, non-magnetic structure and a higher yield strength than conventional stainless steel, have led to widespread use of UGI® HT286 for fasteners in the aerospace, nuclear, automotive and chemical engineering industries.


    EnvironmentBehaviour
    Sea waterModerate
    HumidityExcellent
    Sour oil/gasModerate
    Salt spray (NaCl)Good


    Test environment
    Boiling solution
    Corrosion rate in mm/year
    AISI 304UGI® HT286
    20%w acetic acid< 0.01< 0.01
    45%w formic acid1.20.2
    10%w oxalic acid1.20.4
    1%w hydrochloric acid2.72.1
    10%w sulphuric acid>120.75
    20%w phosphoric acid<0.010.35
    10%w sodium bisulfate1.60.2

    General machinability

    UGI® HT286 is more difficult to machine than standard stainless steels, mainly because of the very low sulphur content required to guarantee that this grade has a good hot workability. Without sulphide content, during machining UGI® HT286 produces long chips that are difficult to manage, especially in drilling operations.

    Because of its high mechanical characteristics in the aged condition (even at the temperatures reached in the vicinity of the cutting tool), UGI® HT286 is often machined in its annealed condition. But, in this condition, sticking and edge build-up phenomena on the tools used results in poor tool life and a very bad surface finish. It can therefore be advisable to increase the mechanical characteristics of the material in its annealed condition through cold working or through an ‘ageing’ heat treatment prior to machining. Compared to other superalloys, relatively high speeds can be used to machine UGI® HT286. During machining, this grade is subject to work hardening, inducing tough chips but also a harder machined surface than the original material. This results in notching and chipping during subsequent machining passes. Sharper, more positive cutting edges reduce this phenomenon and are therefore preferred. Generally CVD (chemical vapor deposition) coatings are preferred for improved speed capability and longer tool life.

    Heat Treatment

    UGI® HT286 is heat treated in 2 stages corresponding to solution annealing and ageing.


    Solution annealing: 1 hour at 980°C, followed by water cooling

  • This solution-annealing treatment regenerates and softens the structure after cold working (i.e. cold heading, drawing, etc.).


    Ageing: 16 h at 710/730°C, followed by air cooling for annealed condition.

  • Ageing is used to precipitate the Ni3(Ti,Al) phase essential for obtaining the required yield strength and high temperature creep properties.

  • Other

    Available products:


    ProductFormFinishToleranceDimensions
    BarsRoundAs drawn or groundh7 min1-15
    RoundTurned and polishedh10-h112-70 mm
    Drawn wireRoundDrawn (1)0.8-18 mm
    ProfileBright2-70 mm²


    (1)With or without soap coating


    Other products: contact the supplier