Module 6: Review Questions

When drilling stainless steel, use a.

• drill ground to 120 °, slow cutting speed.

• drill ground to 90 °, fast cutting speed.

• drill ground to 90 °, slow cutting speed.

How is a material galvanised?.

• Sprayed with nickel solution.

• Packed in a drum containing zinc dust and heated.

• Dipped in a bath of molten zinc.

What temperature would steel be tempered at?.

• At the annealing temperature.

• Above the annealing temperature.

• Below the annealing temperature.

Tempering steel gives.

• greater brittleness.

• greater hardness.

• relief of internal stress after hardening.

The addition of chromium to steel will produce.

• toughness.

• hardness.

• ductility.

Chromium added to plain carbon steel.

• increases it's resistance to corrosion.

• turns it into a non-ferrous alloy.

• makes the metal softer.

The purpose of case hardening is to.

• produce a hard case over a tough core.

• reduce the carbon in the steel.

• introduce carbon into the steel.

At normal temperatures HC steel is harder because.

• it has more austenite.

• of the % of carbon in the granules.

• it has less austenite.

Nitriding is.

• tempering.

• anodising.

• case hardening.

Medium carbon steels have a carbon content of.

• 0.3 - 0.5 %.

• 0.5 - 0.8 %.

• 0.8 - 1.05 %.