Stainless steel itself is made in an electric arc furnace. Carbon electrodes blast currents through scraps of steel. The scraps of steel can be mixed with other elements than chromium, such as nickel, nitrogen, and molybdenum. All of this has to be in a high-temperature environment.
Upon reaching the critical melting point, the steel scraps and alloys start intermixing until the result is one homogeneous metal fusion. The whole mass is then transferred to an argon oxygen decarbonation (AOD) vessel where deoxygenation occurs. Afterward, casting or forging can be done. Because of its malleable and ductile abilities, the metal can be manipulated into a variety of shapes and forms, or drawn into wires.
As a finishing touch, an electrochemical process can treat the steel into different colors, some of which are gold, bronze, green, blue, and black. Another optional finishing touch is dipping the product in an acid bath, which eliminates any scaling on the stainless steel for a better polished appearance and easy cleanability after usage.
Oversimplifying it alot: Iron + Carbon --> High Carbon Steel High Carbon Steel + Chromium & other surface alloy metals --> Stainless Steel Basically Stainless Steel is ordinary Steel with a surface Chrome Steel layer protecting it from corrosion.
By adding other metals like chrome and nickel to the mix. the resulting alloy is the strongly corrosion resistant.
The improvement from iron to stainless steel is that another metal alloy had been created. This new alloy allows for improvements to life in general since it has other uses than that of ordinary iron. Surgical instruments come to mind, they would not exist as we know them without the evolution of metallurgy which made stainless steel and many other useful alloys possible.
Stainless steel is stronger and retards rust unlike iron
Chromium and nickel are metals mixed with iron. Carbon is also added.
The four main elements in stainless steel are iron, chromium, nickel, and carbon. These elements interact to provide stainless steel with its unique properties such as corrosion resistance, strength, and durability.
There's a fundamental problem with the question. Iron is not a "mineral" in the usual sense of the word. Elemental iron is too reactive to be found in nature as a mineral. Leaving that aside... Steel is not "iron". It's mostly iron, with a small admixture of other stuff. So it's not the same as elemental iron, but it's pretty close.
stainless steel
Good quality stainless steel should never rust. I have noticed that the high iron content in our water causes red particles of iron oxide to remain on stainless steel vessels - and it looks exactly like rust but its just the iron in the water drying out on the stainless steel.
Yes, stainless steel is not magnetic in the same way as materials like iron, nickel, and cobalt. A regular magnet will not stick to stainless steel, although some types of stainless steel can become weakly magnetic through processes like cold-working.
Chrome is used with iron to create stainless steel alloys.
Stainless Steel; all other choices are elements - stainless steel is a steel alloy (composite elements).