Module 6

What temperature would steel be tempered at?

• At the annealing temperature.

• Above the annealing temperature.

• Below the annealing temperature.

Chromium added to plain carbon steel.

• Increases its resistance to corrosion.

• Turns it into a non-ferrous alloy.

• Makes the metal softer

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

Tempering entails.

• Heating under the UCP and slow cooling.

• Heating over the UCP and fast cooling.

• Heating over the UCP and slow cooling.

Nitriding is.

• Tempering.

• Anodizing.

• Case hardening

A ferrous metal contains.

• Aluminium.

• Iron.

• Magnesium.

With respect to ferrous metals which of the following is true?

• Iron is not any element of ferrous metals.

• Iron is a main element and most ferrous metal are magnetic.

• Iron is a main element and ferrous metals are not magnetic.

The normalizing process on steel is required sometimes as it

• Provides a corrosion resistant layer that prevents oxidation.

• Allows the material a greater stress per unit area.

• Relieves internal stress suffered after engineering processes

The hardness of steel depends upon.

• Formation of pearlite into austenite.

• Formation of cementite. (iron carbide)

• The iron austenite grain structure

The difference between annealing and normalizing is.

• Both are heated above the UCT, cool slowly to anneal, cool in air to normalize

• Both are heated below the UCT, cool in air to anneal, cool slowly to normalize.

• Both are heated above the UCT, cool in air to anneal, cool slowly to normalize.