Mechanical Engineering - Engineering Materials - Discussion

The correct answer is manganese.

Manganese (Mn) raises the yield point and improves the resistance to atmospheric corrosion in low carbon steels. Manganese:

1. Acts as a strengthening agent, increasing the yield point.
2. Forms a protective oxide layer on the surface, reducing corrosion.
3. Enhances the steel's ability to resist oxidation and scaling at high temperatures.
4. Improves the steel's toughness and ductility.

Silicon (Si) also has a positive effect on steel, but it is more effective in high-temperature applications.

The other options are not accurate:

- Sulphur (S) and phosphorus (P) are typically considered impurities in steel and can:
- Embrittle the steel.
- Reduce its ductility and toughness.
- Increase its susceptibility to corrosion.

So, the specific effect of manganese on low carbon steels can vary depending on the steel composition, processing history, and testing conditions. However, in general, manganese is known to improve the yield point and corrosion resistance of low carbon steels.

What about in high carbon steels?

how to improve atmospheric corrosion