Alloying Elements. What’re the Effects on Stainless Steels?
In the previous post we talked about the effect of alloying elements on stainless steels. We have already dealt with elements such as chromium, aluminum or carbon. Here’s more..
The alloying elements and their effect on stainless steel.
MOLYBDENUM:
- It’s maintains a stable austenitic structure, even at ambient temperature.
- If we adding 2-3% of this elements in AISI 304 austenitic steel, we increase the stability of the passive layer in the presence of environments that contain high concentrations of chlorides.
- In contact with sulfuric, phosphoric and hydrochloric acid are used austenitic with Mo until 5%.
- It is an element ferrite former.
- Increases the corrosion resistance (crevice) and stress corrosion.
- Together with chromium increases resistance to pitting corrosion.
NICKEL:
- High levels of nickel austenitic alloys give rise to stable at room temperature characterized by:
– good ductility
– high tenacity even at cryogenic temperatures
– good mechanical resistance to heat
– good attitude to welding
– good corrosion resistance in poorly oxidants.
- With percentages of nickel exceeding 30% buy steel excellent resistance to stress corrosion cracking. By increasing the resistance to pitting corrosion.
Other alloying elements.
NIOBIUM:
- It stable carbides form can improve:
– mechanical strength
– creep resistance.
- It is a stabilizing element that prevents the precipitation of chrome carbides during heat treatment and welding.
COPPER:
- In some cases this element increases the effectiveness of nickel.
- In the austenitic grades it improves:
– the corrosion resistance (even with sulfuric acid at 10% with a temperature of 80° C
– the cold deformability.
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