UGI® 4828

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Description

UGI® 4828 is a heat-resistant austenitic stainless steel with a higher silicon content than type-309 stainless steel (UNS 30900). Its high chromium and nickel contents, in addition to the silicon, provide superior resistance to oxidation and good strength at both ambient and elevated temperatures, even in sulphur-containing gases. UGI® 4828 is used for parts subject to high temperatures of up to 1000°C in furnaces, turbochargers, heat exchangers, and equipment used in the chemical, oil and glass industries.

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

PropertyValue

Density

7.9 g/cm³

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Mechanical

PropertyTemperatureValueComment

Creep strength 10^3 cycles

600 °C

190 MPa

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700 °C

75 MPa

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800 °C

40 MPa

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900 °C

15 MPa

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Creep strength 10^4 cycles

600 °C

120 MPa

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10^4 cycles

700 °C

36 MPa

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10^4 cycles

800 °C

18 MPa

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10^4 cycles

900 °C

8.5 MPa

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10^4 cycles

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Creep strength 10^5 cycles

600 °C

65 MPa

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10^5 cycles

700 °C

10 MPa

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10^5 cycles

800 °C

7.5 MPa

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10^5 cycles

900 °C

3 MPa

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10^5 cycles

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Elastic modulus

20 °C

196 GPa

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200 °C

185 GPa

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400 °C

170 GPa

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600 °C

155 GPa

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800 °C

135 GPa

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1000 °C

120 GPa

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Elongation

30 %

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min., for 20-800°C

Hardness, Brinell

223.0

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Hardness, Rockwell B

95.0

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Tensile strength

20 °C

550.0 - 750.0 MPa

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100 °C

470.0 - 670.0 MPa

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200 °C

440.0 - 640.0 MPa

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400 °C

400.0 - 600.0 MPa

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600 °C

350.0 - 650.0 MPa

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800 °C

200.0 - 400.0 MPa

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Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

0.0000165 1/K

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20 to 200°C

0.0000175 1/K

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20 to 400°C

0.0000195 1/K

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20 to 100°C0

600 °C

0.000018 1/K

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800 °C

0.0000185 1/K

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Specific heat capacity

20 °C

500 J/(kg·K)

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200 °C

550 J/(kg·K)

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400 °C

590 J/(kg·K)

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600 °C

620 J/(kg·K)

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800 °C

650 J/(kg·K)

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1000 °C

670 J/(kg·K)

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Thermal conductivity

20 °C

15 W/(m·K)

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200 °C

17 W/(m·K)

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400 °C

20 W/(m·K)

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600 °C

23 W/(m·K)

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800 °C

25 W/(m·K)

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1000 °C

28 W/(m·K)

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Electrical

PropertyTemperatureValue

Electrical resistivity

20 °C

0.00000085 Ω·m

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200 °C

0.00000105 Ω·m

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400 °C

0.0000012 Ω·m

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600 °C

0.0000013 Ω·m

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800 °C

0.0000014 Ω·m

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1000 °C

0.00000145 Ω·m

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Chemical properties

PropertyValueComment

Carbon

0.15

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max.

Chromium

19.0 - 20.0 %

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Manganese

2.0

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Nickel

11.0 - 12.5 %

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Nitrogen

0.1

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max.

Phosphorus

0.04

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max.

Silicon

1.5 - 2.5 %

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Sulfur

0.015

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max.

Technological properties

Property
Application areas

  • Turbochargers: nozzle parts.
  • Furnace equipment: conveyor belts, doors and burner fixings.
  • Refinery and chemical process equipment.
  • Energy conversion plants: grid, heat recuperators.
  • Cement industry: rotary kilns, burner shields, refractory anchors.
  • Iron, steel and non-ferrous industries: extraction hoods, heat exchanger elements.

  • Cold Forming

    Bending – Forming

    Like other austenitic steels and heat-resistant steels, UGI® 4828 can be cold worked easily. Because UGI® 4828 is ductile, it is well suited to bending and forming. However, long-term high-temperature service may reduce the ductility of the steel. Initial ductility can be restored with a solution annealing heat treatment.

    Corrosion properties

    UGI® 4828 has good corrosion resistance. The austenitic microstructure combined with the high silicon (≥1.5%) and chromium additions (≥ 19%) give this alloy a better high-temperature corrosion resistance than the AISI 321 or AISI 347 grades. This grade is not designed for wet corrosion resistance purposes even though, in its annealed condition, UGI® 4828 provides better corrosion resistance in a marine atmosphere than UGI® 4307 (AISI 304L).


    High-temperature oxidation resistance

    UGI® 4828 has a high destructive scaling temperature and thus exhibits good scaling resistance in both continuous and intermittent service up to 1000°C (see the chart on the right side of the material page).

    Typical working temperatures of UGI® 4828 in sulphur-containing gases are as follows:

  • Oxidizing atmospheres with maximum sulphur content of 2 g/m³: 1000°C maximum continuous service and 950°C with thermal cycles.
  • Low oxygen-containing atmosphere with sulphur content lower than 2 g/m³: 850°C maximum.
  • Low oxygen-containing atmosphere with sulphur content higher than 2 g/m³: 700°C maximum.
  • UGI® 4828 is not designed for service in reducing nitriding or carburizing atmospheres.
  • General machinability

    In the graphs on the right side og the material page is a comparison of UGI® 4828 with UGI® 4541, UGI® 4841 and UGI® 4845 in turning with a SECO TM2000 CNMG 120408-MF4 tool, in terms of:

  • Productivity at a given tool-wear rate (VB15/0.15, i.e. the cutting speed resulting in a flank wear VB of 0.15 mm in 15 min of effective cutting at f = 0.25 mm/rev and ap = 1.5 mm, without lubricant)
  • Chip breakability (amount of well broken and intermediate chips over 56 tested conditions between f = 0.1 and 0.4 mm/rev and ap = 1 and 4 mm).

    In terms of productivity, UGI® 4828 is inferior to UGI® 4541 (mainly because of the high sulphur content of UGI® 4541) and similar to UGI® 4841 and UGI® 4845 (despite its much lower Ni content compared to these two grades). In terms of chip breakability, owing to its moderate carbon content and high silicon content, UGI® 4828 is similar to UGI® 4541, despite its lower sulphur content. It is superior to UGI®4841 and far superior to UGI® 4845, which have very low sulphur contents.

  • Heat Treatment

    Solution annealing

    Optimal material properties are produced after solution annealing at between 1050°C and 1150°C. This should be followed by a rapid cooling in air or water.

    Hot forming

    Forging

    UGI® 4828 can be easily forged at between 800°C and 1150°C. Components should be cooled quickly, this can be done either in air or in water. Post-forging annealing heat treatment is not generally required since the material is designed for high-temperature applications.

    Other

    Available products:


    ProductFormFinishToleranceDimensions

    Bars
    RoundDrawnh92-28 mm
    RoundTurned and polishedh10-h1122-130 mm
    RoundDescaledh12-k1122-130 mm
    HexagonalDrawn3-55 mm
    Wire rodRoundPickled5-32 mm
    Drawn wireRoundHot0.8-16 mm
    ProfileBright2-70 m²


    Other products: contact the supplier

    Surface Treatment

    Pickling

    Mechanical methods are preferred to pickling to remove oxides, slag and incrustations. Strong pickling pastes should be avoided since the welded alloy is susceptible to intergranular corrosion.

    Welding

    UGI® 4828 has good/very good weldability. It is weldable using all the usual arc welding processes such as GMAW, GTAW, SAW and SMAW. Laser beam welding must be used with care because of its tendency to promote hot cracking in this kind of austenitic grade. No preheating is required and no post-weld heat treatment is required.

    Nickel-based filler materials containing Niobium are not recommended since intermetallic intergranular precipitations may occur at the fusion line. The interpass temperature should be limited to 150°C.

    Precautions:

  • Cleaning and degreasing of weld areas.
  • Mechanical methods are preferred to pickling to remove oxide, slag and incrustations.