DIN 1.4828 Austenitic chromium-nickel / heat resistant stainless steel plates

Alloy 1Cr20Ni14Si2 / 309Si2 is an austenitic chromium-nickel stainless steel which has excellent

heat-resisting properties.

Alloy 1Cr20Ni14Si2 / 309Si2 has improved corrosion resistance and better creep strength than alloy 304.

Designations

GB  1Cr20Ni14Si2  / 309Si2

EN  1.4828

DIN X15CrNiSi20- 12

Chemical composition %

Applications

* Construction of high temperature components

* automotive engineering

* chains, screens and mesh

* mechanical engineering

* furance engineering

High temperature resistance

It has a low resistance to oxidising and reducing sulphur bearing gases.

In these gasses, the use of Ferrotherm 4828 is generally limited to temperatures below 650°c.

The resistance to carburising (up to 900°c) and to nitrogen bearing, oxygen depleted gases is average.

Heat treatment/mechanical properties

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.

In the solution annealed condition the following mechanical properties may be attained when testing

in the longitudinal direction at room temperature:

Property                                      Specification                       Typical -

yield strength (N/mm 2 )                 Rp0,2  : 230                        400

tensile strength (N/mm 2 )             Rm      : 550 – 750             675

tensile elongation (%)                    A5       : 30                            45

hardness                                          HB       : 223

Welding

1Cr20Ni14Si2 / 309Si2 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 1Cr20Ni14Si2 / 309Si2.

Forging

Forging is usually performed at 1150 - 800°c followed by rapid cooling in air or water.

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