Mild Steel is not hard and brittle. Once Mild Steel is subjected to heating and then allowed to cool, it forms different compounds of steel having different properties.
This depends upon
1. The heating temperature
2. The time allowed for cooling.
When MS is heated to high temperatures so that it appears red hot and then suddenly cooled down to ambient temperature, it forms a compound called Martensite, which is hard. This is because there is more carbon in Martensite then in Mild Steel. This process of altering properties of compounds by heat is called heat treatment.
heated up to kindling temperature of the mild steel
yes of course
Mild steel is harder than copper as it has a higher hardness level on the Mohs scale. Mild steel is commonly used in construction and manufacturing due to its durability and strength, while copper is known for its excellent electrical conductivity and malleability.
heating mild steel to 200c
contracts (get smaller)
The main difference between cast iron and mild steel is the carbon content. Mild steel has a lower carbon content than cast iron. This makes cast iron brittle, while mild steel is much harder.
contracts (get smaller)
Specifics of their alloys, they'll have different proportions of carbon, iron, chrome etc. These changes will make the one known as steel a little stronger and harder to machine than the one called mild steel.
mild steel is heavier
Per the attached related link, the density (hence weight) of stainless is slightly more than the mild carbon steel. Using about 8.03/7.84 ratio of density, for the same volume of material the stainless will weigh 2.4 % more.
Mild steel
Mild steel, not copper.