Carbon steel, on the other hand, is much lower in chromium and is instead a carbon-iron alloy with only a small amount, if any, of other materials as part of its composition. Therefore, it can be called a "low alloy" steel. Both stainless steel and carbon steel have this basic composition, but carbon steel can be defined by its carbon content. This is usually around 2-2.5%, but this can often vary. While carbon steel is prone to rust, unlike stainless steel, carbon steel is generally cheaper and has different mechanical properties depending on the carbon content.
Mild steel is weaker and softer, but easier to machine and weld; while higher carbon steel is stronger, it is more difficult to machine.

Types of carbon steel
The defining element of any carbon steel alloy is its carbon content, so this is how the various types of carbon steel are sorted and classified.
Mild Steel: The most widely used of carbon steels, with a carbon content below 0.25% - they are generally relatively weak and soft, but are easier to weld and ductile, so are often used for machining and welding for lower cost cost
Medium carbon steels: 0.25-0.6% carbon and 0.6-1.65% manganese, these metals can be improved by heat treatment, but only in very thin sections unless additional alloying elements are added – these steels are Mild steel is stronger but less ductile
High Carbon Steel: This is the hardest, toughest carbon steel, the least ductile, very wear resistant, and almost always hardened and tempered - they tend to have 0.6-1.25% carbon and 0.3-0.9 manganese %
advantage
increased intensity
cheaper than stainless steel
Wear-resistant
durable and shock-resistant
Safe to handle and use compared to other metals
Eco-friendly and easy to recycle
shortcoming
Powerful, sometimes difficult to work with
Brittle, not easy to bend or shape
more prone to rust and corrosion
The appearance is not beautiful and cannot reach the finish of stainless steel
application
Various types of carbon steel are suitable for a wide range of industries and fields. Mild steels are used in automotive body components, pipes, construction and bridge components, and food cans. Medium carbon steel can be used for rails, train wheels, crankshafts, gears, and mechanical parts that require high strength and toughness. Similarly, high carbon steel can be used for cutting tools, springs, high-strength wires, and molds due to its high hardness.

Can stainless steel be welded to carbon steel?
Although it is technically possible to weld these different types of metals together, the general consensus is that doing so is not advisable. Welding of carbon steel and stainless steel is not usually done because they have different levels of conductivity. Carbon steel is usually preheated during resistance welding because it conducts electricity better and doesn't heat up as quickly as stainless steel. Therefore, it is often very difficult to achieve a suitable soldering temperature. Therefore, it is generally recommended that similar types of steel be welded together rather than mix and match.