Permodur 4828 +AT

Alternative and trade names
Permodur 4828, 1.4828, X15CrNiSi20-12
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Description

FERROTHERM® 4828 is a standard grade for furnace construction and other high temperature components. Compared to FERROTHERM® 4878 and 4713, FERROTHERM® 4828 is considerably improved in its scaling resistance. Due to its high tensile strength at higher temperatures, FERROTHERM® 4828 is ideal for applications where special emphasis is placed on the mechanical properties.

Related Standards

Equivalent Materials

This material data has been provided by Deutsche Edelstahlwerke Specialty Steel (DEW).

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

PropertyValue

Elastic modulus

200 GPa

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Hardness, Brinell

223.0

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Tensile strength

550.0 - 750.0 MPa

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Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

200 °C

0.0000165 1/K

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for 20°C to the mentioned temperature

400 °C

0.0000175 1/K

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for 20°C to the mentioned temperature

600 °C

0.000018 1/K

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for 20°C to the mentioned temperature

800 °C

0.0000185 1/K

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for 20°C to the mentioned temperature

1000 °C

0.0000195 1/K

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for 20°C to the mentioned temperature

Specific heat capacity

500.0 J/(kg·K)

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Thermal conductivity

500 °C

15.0 - 21.0 W/(m·K)

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Electrical

PropertyValue

Electrical resistivity

8.5e-07 Ω·m

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Chemical properties

PropertyValue

Carbon

0.2

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Chromium

19.0 - 21.0 %

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Nickel

11.0 - 13.0 %

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Phosphorus

0.045

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Silicon

1.5 - 2.0 %

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Sulfur

0.015

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Technological properties

Property
Application areas

Construction of high temperature components, Automotive engineering, Chains, screens and mesh, Mechanical engineering, Furnace engineering

Corrosion properties

FERROTHERM® 4828 is only slightly resistant to both oxidising and reducing sulphurous gases. In these media the use of FERROTHERM® 4828 is limited to temperatures below 650 °C. The corrosion resistance to carbonizing (up to 900 °C) as well as to nitrogenous, oxygen-poor gases is to be classified as medium.

General machinability

Good - The formation of carbides in 1.4828 will result in increased wear of cutting tools. In addition to this, rapid work hardening and poor thermal conductivity require the use of adequate cooling and good quality cutting/machining tools.

Heat Treatment

Optimal material properties are realised after solution annealing in the temperature range 1050 - 1150°C followed by rapid cooling in air or water. During operation and fabrication, the time spent in the temperature range 550 - 900°C must be minimised to avoid embrittlement, both chromium carbide precipitation and sigma phase formation. This embrittlement effect can be reversed by solution annealing the steel at a temperature in the range 1050 to 1100°C.

Processing history

Solution Annealed

Welding

Good - 1.4828 is weldable using all usual welding processes with no preheating being required. Low heat inputs should be used when welding, and post weld heat treatment is not necessary. Novonit 4829 and 4842 are suitable for use as filler materials when welding 1.4828.