Acidur 4122 is characterised by its combination of outstanding mechanical properties, (after heat treatment) and a corrosion resistance which is comparable with that of 1.4016. This steel can also be polished to high gloss finishes.
Charpy impact energy aK,charpy
10 J at 20 °C
Elongation A5 A5
12 % at 20 °C
Tensile strength Rm
750 - 950 MPa at 20 °C
Yield strength Rp0.2 Rp0.2
550 MPa at 20 °C
Coefficient of thermal expansion α
1.041E-5 1/K at 100 °C
15.5 - 17.5 %
Automotive industry, Pump shafts, Food and Beverage industry, Mechanical engineering, Cutting Tools, Building industry
Good - As a result of its higher chromium content, 17 %, 1.4122 is more corrosion resistant than 1.4006 and other 13 % chromium stainless steels. Good corrosion resistance is displayed in moderately corrosive media/environments with low chloride ion concentrations. Although the addition of molybdenum increases the resistance of this steel to chloride containing environments, it is not suited for use in sea water applications unless it is provided with cathodic protection. Optimal corrosion resistance is attained when the surface is finely ground or polished.
With Care - The machinability of this grade of stainless steel is directly related to its hardness and as such the optimal machining parameters vary considerably. Once the hardness is known, the machining parameters can be estimated since 1.4122 machines similar to carbon steels of the same hardness. Although it must be realised that the machining parameters will vary depending on the structure/hardness of the steel.
Quenched and tempered QT 750
This material data has been provided by Deutsche Edelstahlwerke Specialty Steel (DEW).