Types of Carbon Steel

Carbon steel is the most common steel used in engineering and fabrication.Its behavior mainly depends on carbon content and how it is made.

Based on Carbon Content

-Low Carbon Steel (up to 0.25% C), also called mild steel.
Soft, easy to bend, easy to weld.

Used for: Pipes, building structures, car body panels, ships.

- Medium Carbon Steel (0.25–0.60% C)
Stronger than mild steel.
Can be heat treated for more hardness.

Used for: Gears, shafts, axles, crankshafts, pressure parts.

- High Carbon Steel (0.60–1.00% C)
Very hard and strong.
Less ductile, can break if overloaded.

Used for: Cutting tools, springs, wires, punches.

- Ultra-High Carbon Steel (1.00–2.00% C)
Extremely hard after heat treatment.
Very brittle.

Used for: Dies, special knives, heavy wear tools.

Based on Microstructure

- Ferritic Steel
Soft and ductile.

Used for: Car panels, general construction.

- Stronger than ferrite.
Better wear resistance.

Used for: Railways, wire ropes, structures.

- Martensitic Steel

Very hard but brittle.
Formed by quenching.

Used for: Knives, tools, wear parts.


Based on Deoxidation Method

- Killed Steel
Fully treated steel.
Uniform internal structure.

Used for: Boilers, pressure vessels.

- Semi-Killed Steel
Partially treated.
Lower cost.

Used for: General structural work.

- Rimmed Steel

Good surface finish.
Less uniform inside.

Used for: Automotive sheets, utensils.


Carbon steel is not one single material. The right choice depends on:
- Strength
- Weldability
- Toughness 
- Cost
- End application

Correct selection = better safety and longer life.