MATERIALS ACTIVITY 2 MEMORANDUM Properties of structures: 1.1 Soft √ Ductile √ Grey or white in colour (Any 2 X 1) (2) √ 1.2 Ductile √ Hard √ Strong and tough √ Resistant to deformation (Any 2 X 1) (2) √ 2. (2) Cementite √√ Classes of steel Bolts, nuts, screws and rivets (Any 1 X 1) (1) √ 3.2 Surface hardening (case hardened), hardening and tempering √ (Any 1 X 1) (1) 3.3 Brittle, poor weld ability √ (Any 1 X 1) (1) 4. Definition: 4.1 Lower critical point (AC1): This is the lowest temperature to which steel must be heated to be hardened. (2) √√ 4.2 Critical Temperature: It is the temperature where a structural change takes place. (2) √√ [13]
MATERIALS ACTIVITY 2 MEMORANDUM Properties of structures: 1.1 Soft √ Ductile √ Grey or white in colour √ (Any 2 X 1) (2) 1.2 Ductile √ Hard √ Strong and tough √ Resistant to deformation √ (Any 2 X 1) (2) 2. Cementite √√ (2) Classes of steel Bolts, nuts, screws and rivets √ (Any 1 X 1) (1) 3.2 Surface hardening (case hardened), hardening and tempering √ (Any 1 X 1) (1) 3.3 Brittle, poor weld ability √ (Any 1 X 1) (1) 4. Definition: 4.1 Lower critical point (AC1): This is the lowest temperature to which steel must be heated to be hardened. √√ (2) 4.2 Critical Temperature: It is the temperature where a structural change takes place. √√ (2) [13]