Stainless steel is an iron and chromium alloy.
While stainless steel must contain at least 10.5% chromium, the exact composition and proportions will vary depending on the grade required and the steel's intended use.
Other common additives include:
nickel
carbon
manganese
molybdenum
nitrogen
sulfur
copper
silicon
The exact composition of the alloy is rigorously measured and evaluated throughout the alloying process to ensure the steel has the desired quality.
Common reasons for adding other metals and gases to stainless steel alloys include:
Improve corrosion resistance
High temperature resistance
Low temperature resistance
increase strength
Improve weldability
Improve formability
control magnetism
However, the composition in stainless steel is not the only factor that determines its unique properties…
The way it is made will further change the properties of the steel.
