UGIALLOY® 686

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Description

UGIALLOY® 686 filler wire contains high quantities of chromium, molybdenum and tungsten, enabling it to be used for welds or claddings that are more resistant to corrosion and/or oxidation than the majority of nickel-based grades in many highly corrosive environments (chemical, waste treatment, fertilizers, etc.). For example, its general corrosion resistance in very harsh aqueous environments is considered higher than that of Alloy 59 (which is itself much higher than that of alloy 625).


UGIALLOY® 686 is used for the homogenous welding of UNS N06686 and to weld many Ni-Cr-Mo alloys with a low C content and fewer alloying elements than UNS N06686, as well as for welding superaustenitic and super-duplex stainless steels.

Finally, UGIALLOY® 686 is used for coating steels or stainless steels to improve corrosion and/or oxidation resistance in very harsh environments (for example for incinerator parts).

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

8.72 g/cm³

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Mechanical

PropertyTemperatureValue

Charpy impact energy, V-notch

-40.0 °C

80 - 90 J

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Elastic modulus

20.0 °C

207 GPa

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100.0 °C

205 GPa

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200.0 °C

197 GPa

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300.0 °C

193 GPa

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400.0 °C

185 GPa

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500.0 °C

183 GPa

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600.0 °C

173 GPa

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700.0 °C

165 GPa

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Elongation

23.0 °C

40 %

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Tensile strength

23.0 °C

798 MPa

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Yield strength

23.0 °C

507 MPa

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Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

100.0 °C

1.1E-5 1/K

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for 20 to mentioned temperature

200.0 °C

1.28E-5 1/K

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for 20 to mentioned temperature

300.0 °C

1.48E-5 1/K

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for 20 to mentioned temperature

400.0 °C

1.66E-5 1/K

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for 20 to mentioned temperature

500.0 °C

1.86E-5 1/K

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for 20 to mentioned temperature

600.0 °C

2.14E-5 1/K

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for 20 to mentioned temperature

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Specific heat capacity

20.0 °C

373 J/(kg·K)

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100.0 °C

389 J/(kg·K)

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200.0 °C

410 J/(kg·K)

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300.0 °C

431 J/(kg·K)

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400.0 °C

456 J/(kg·K)

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500.0 °C

477 J/(kg·K)

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600.0 °C

498 J/(kg·K)

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700.0 °C

519 J/(kg·K)

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Thermal conductivity

20.0 °C

9.82 W/(m·K)

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100.0 °C

11 W/(m·K)

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200.0 °C

12.8 W/(m·K)

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300.0 °C

14.8 W/(m·K)

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400.0 °C

16.6 W/(m·K)

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500.0 °C

18.6 W/(m·K)

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600.0 °C

21.4 W/(m·K)

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700.0 °C

23.5 W/(m·K)

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Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

1.24E-6 Ω·m

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100.0 °C

1.25E-6 Ω·m

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200.0 °C

1.26E-6 Ω·m

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300.0 °C

1.26E-6 Ω·m

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400.0 °C

1.27E-6 Ω·m

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500.0 °C

1.29E-6 Ω·m

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600.0 °C

1.3E-6 Ω·m

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700.0 °C

1.28E-6 Ω·m

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Magnetic

PropertyTemperatureValueComment

Relative magnetic permeability

23.0 °C

1 [-]

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at 200 Oe (15.9 kA/m)

Chemical properties

PropertyValueComment

Aluminium

0.5 %

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max.

Carbon

0.01 %

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max.

Chromium

19 - 23 %

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Copper

0.5 %

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max.

Iron

2 %

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max.

Manganese

0.1 %

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max.

Molybdenum

15 - 17 %

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Nickel

49 %

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min.

Phosphorus

0.02 %

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max.

Silicon

0.08 %

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max.

Sulfur

0.02 %

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max.

Titanium

0.25 %

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max.

Tungsten

3 - 4.4 %

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Technological properties

Property
Application areas

Coatings or weldings in highly corrosive environments such as:

  • Chemical treatments (including heat exchangers, reactors, evaporators, etc.)
  • Pollution removal (including columns, pipes, housings, etc.)
  • Paper manufacturing industry
  • Waste treatment
  • Petrochemical
  • Harsh marine environment
  • Corrosion properties

    General corrosion: The table below gives the general corrosion rates in mm/year for different assemblies made from UGIALLOY® 686 and other filler wires kept in an acid environment of 10% H₂SO₄ + 2% HCl at 80°C for 7 days.


    Base metalFiller wire Corrosion rate (in mm/year)
    GTAW across thin sheets GMAW across thin sheetsSAW across thick sheets
    UNS N06686UGIALLOY® 6860.40.50.6
    UNS N06022UGIALLOY® 6861.21.21.3
    UNS N06022UGIALLOY® 221.31.31.5
    UNS N06276UGIALLOY® 6860.7(a)0.60.8
    UNS N06276UGIALLOY® 2760.70.70.9
    (a) Slight attack in the heat affected zone


    Localized corrosion

    Pitting corrosion: The table below gives the pitting corrosion rates in terms of maximum pitting depth in mm/year for different assemblies made from UGIALLOY® 686 and other filler wires kept in an SO₂ + 26% NaCl saturated environment at 80°C for 14 days.


    Base metalFiller wireMaximum attack depth (in mm/year): base metal /weld metal zone
    GTAW across thin sheetsGTAW across thick sheetsGMAW across thin sheetsGMAW across thick sheetsSAW across thick sheets
    UNS N06686UGIALLOY® 6860/00/00/00/00/0
    UNS N06022UGIALLOY® 6860.4/0.10.3/00.2/00.4/0.10.4/0
    UNS N06022UGIALLOY® 220.3/0.50.4/0.70.2/0.30.6/0.60.4/0.8
    UNS N06276UGIALLOY® 6860.8/0.40.7/0.50.6/0.50.7/0.50.7/0.3
    UNS N06276UGIALLOY® 2760.7/0.80.6/0.90.4/0.60.6/1.00.5/1.1


    The table below gives the pitting corrosion rates in terms of maximum pitting depth in mm/year for different assemblies made from UGIALLOY® 686 and other filler wires kept in an 11.9% H₂SO₄ + 1% CuCl2 environment at 103°C for 7 days.


    Base metalFiller wireMaximum attack depth (in mm/year): base metal /weld metal zone
    GTAW across thin sheets GTAW across thick sheetsGMAW across thin sheetsGMAW across thick sheetsSAW across thick sheets
    UNS N06686UGIALLOY® 6860/00/00/00/00/0
    UNS N06022UGIALLOY® 6860.4/0.10.3/00.2/00.4/0.10.4/0
    UNS N06022UGIALLOY® 220.3/0.50.4/0.70.2/0.30.6/0.60.4/0.8
    UNS N06276UGIALLOY® 6860.8/0.40.7/0.50.6/0.50.7/0.50.7/0.3
    UNS N06276UGIALLOY® 2760.7/0.80.6/0.90.4/0.60.6/1.00.5/1.1


    Intergranular corrosion: The table on the right side of the material page gives the intergranular corrosion rates in mm/year for different assemblies made from UGIALLOY® 686 and other filler wires after 24 h under the conditions specified in ASTM G28B.

    Other

    Available products:


    ProductDimensions
    Welding rods∅ 1.0 to 4.0 mm
    Welding wire spools (BS300)∅ 0.8 to 1.6 mm


    For other dimensions or products, please the supplier.

    Welding

    The tables below give the typical welding conditions to be used for UGIALLOY® 686 during MIG and TIG welding with filler wire.


    GMA welding


    Transfer typeWire diameter (mm)Wire speed (m/min)Welding voltage (V)Welding current (A)
    Non-pulsed spray0.911.5-1526-32180-250
    1.26.0-9.026-32220-300
    1.63.5-5.727-33250-350
    Pulsed spray0.97.0-10.219-2290-140
    1.22.5-5.521-26120-190
    1.61.8-3.523-28160-240
    Shielding gas: Ar or mixture of Ar/He with a flow rate of 17 to 23 l/min


    GTA welding


    Wire / rod diameter (mm)Tungsten electrode diameter (mm)Shielding gas feed nozzle diameter (mm)Welding current (A)
    1.61.6-2.49.5-1690-160
    2.41.6-2.49.5-16100-190
    3.22.4-3.212.5-16110-210