Mechanical Engineering - Workshop Technology - Discussion

I think the cold chisel are made from carbon tool steel.

Cold chisels are made from carbon tool-steel, which is usually octagonal in cross-section.

For cutting operation the material should be hard and tough enough to sustain impact so high speed steel, option C is correct answer.

The correct answer is high-speed steel.

Cold chisels are typically made from high-speed steel (HSS), which is a type of tool steel that is designed to maintain its hardness and wear resistance even at high temperatures. HSS is a popular choice for cold chisels because it:

- Has high hardness and wear resistance
- Can withstand the impact and stress of repeated blows
- Retains its cutting-edge well

Here's why the other options are incorrect:

- Cast iron: Cast iron is a brittle material that is not suitable for making chisels, as it may break or shatter under impact.
- Mild steel: Mild steel is a relatively soft material that would not hold up well to the wear and tear of repeated use as a chisel.
- Cast tool steel: While cast tool steel is a type of tool steel, it is not as suitable for making cold chisels as HSS. Cast tool steel may be more prone to cracking or breaking under impact.

High-speed steel is often used for making cutting tools, such as chisels, punches, and drills, due to its unique combination of hardness, toughness, and wear resistance.