Mechanical Engineering - Workshop Technology - Discussion

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.

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

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

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