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Important Facts on
Stainless Steel
Physical properties
The physical properties of a few selected steel types are shown in the table
below for comparison purposes. Pay attention to the higher thermal expansion
and the lower thermal conductivity of Austenitic Steels. Their electrical resistance
is higher than with unalloyed steels because of the alloy contents.
One important distinguishing characteristic between the ferritic / martensitic
Chrome Steels and the Chrome-Nickel Steels is magnetisability. In contrast to
magnetisable Chrome Steels, Austenitic Steels display largely unmagnetisable
behaviour in the solution-annealed state.
With the Austenitic Steels, cold forming can cause a structure change, with
the result that limited magnetisability then exists. However, the Nickel content
significantly influences the magnetisability of the austenitic Stainless Steels,
with the result that when the Nickel content is higher, the tendency towards
magnetisability can be largely prevented even in the cold-formed state.
DIN
Type
Type VD Eh
Modulus of
Elasticity
at 20°C
kN/mm 2
Physical Properties
Thermal
Expansion
20°C and
100°C
10 -6 /K
400°C
10 -6 /K
Thermal
Conductivity
at 20°C
W/m*K
Specific
Thermal
Capacity
at 20°C
J/kg*K
Electric
Resistance
at 20°C
Ω*mm 2 /m
Magnetizable
1.4305 X8CrNiS 18-9 220 10,4 11,6 25 430 0,60 yes
1.4301 X5CrNi18-10 200 16,0 17,5 15 500 0,73 no 1 )
1.4541 X6CrNiTi18-10 200 16,0 17,5 15 500 0,73 no 1 )
1.4401 X5CrNiMo17-12-2 200 16,0 17,5 15 500 0,75 no 1 )
1.4404 X2CrNiMo17-12-2 200 16,0 17,5 15 500 0,75 no 1 )
1.4571 X6CrNiMoTi17-12-2 200 16,5 18,5 15 500 0,75 no 1 )
1.4122 X35CrMo17 200 13,0 300°C 15 500 0,80 yes
14,0
1
) Due to cold forming small parts of Ferrit and/or Martensit may be transformed, therefore increasing magnetizability
12
590