There are lots of stainless steels. Steel, by definition is an alloy containing carbon. The different alloyed elements give various steels their properties -- including strength, stiffness, brittleness, corrosion resistance, among others.
Mild steel contains 0.16-0.29% carbon.
Carbon steel has a carbon content in the range of 0.30-1.70% by weight.
Stainless steel has a minimum of 11% chromium content by mass.
Only stainless steel does not corrode.
"Stainless Steels" don't corrode because one of their alloying metals (usually chromium or molybdenum) forms a passivemigrates to the surface of the solid and forms a thin, hard oxide layer that is difficult to get through. In addition, there are electrochemical reasons why chromium and some other elements are resistant to corrosion.
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M.S. = mild steel S.S. = stainless steel
Yes, higher grade stainless is achieved by cold working a lower grade stainless steel
Density of SS400 grade steel is 7860 kg/m3Refer to the related link for other properties.
in JIS (Japanese) "SS" stands for structural steel, and 400 grade which is similar to AISI 1018.
90 HRB