Alloying Elements. What’re the Effects on Stainless Steels? After chromium, aluminum and carbon, today is the last post about the effect of alloying elements on stainless steels.
The last 6 alloy elements and their effect on steel.
SILICON:
- it is an element capable of providing hot oxidation resistance (flake)
- often it is used in refractory steels
- it dissolves in the liquid matrix, without giving rise to this carbides:
– improves resistance to hardening by solid solution
– decreases the resistance to pitting corrosion (which increases when in the presence of molybdenum)
– raises the characteristics of magnetic permeability and electric resistivity
SELENIUM:
- thanks to its most globular morphology (useful for chip machining time fragmentation) can replace sulphur
- compared to sulphur, affects less on toughness and the degree of surface finishing
- annealing the manganese sulphides (but having a high cost is used only in special cases)
- has limited use (almost in disrepair) because of its high toxicity.
SULPHUR:
- improves machinability but decreases the corrosion resistance
- reduces friction between chips and seizure problems avoiding tool
TITANIUM:
- is a stabilizing element that prevents the precipitation of chrome carbides during heat treatment and welding
- useful in order to counter the intergranular corrosion.
TUNGSTEN:
- useful in order to counter the intergranular corrosion
- useful for some austenitic steels, in order to strengthen the mechanical properties in heat.
VANADIUM:
- has the same characteristic of tungsten.
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