Chapter 4 Alloy Steels Flashcards
Alloy steels can be hardened by oil or even air quenching because the alloying elements in these steels…
decrease the critical cooling rate
** it decreases ccr + another thing
The heat resistance property of high speed steels is due to the presence of large amount of…
tungsten
Austenitic stainless steel are noted for its…
good biocompatibility
Martensitic stainless steel is most suitable for making…
surgical tools
The 1%C-Cr steel is noted for its high hardness and wear resistance. Which of the following components is best made of this steel?
- Crankshafts
- Connecting rods
- Gears
- Ball-bearings
Ball-bearings
18/8 stainless steels contain…
18% Cr and 8% Ni
How to read 18/8
The corrosion resistance of stainless steels is due to the formation on the surface a thin film of…
chromium oxide
Which of the following steels is a alloy steel containing 0.45% carbon?
- 18/4/1
- AISI1045
- AISI2135
- AISI 4345
AISI 4345
Which of the following steels has an austenitic structure at room temperature?
- 18/10 stainless steel
- 18/4/1 high speed steel
- NI-Cr-Mo alloy steel
- 1% C-Cr steel
18/10 stainless steel
Which of the following properties is not an essential requirement for a tool steel?
(a) strength
(b) ductility
(c) toughness
(d) wear resistance
(b) ductility
- why?
The chemical composition of 18-8 stainless steel is:
(a) 18% Cr, 8% Ni
(b) 18% Cr, 8% V
(c) 18% Ni, 8% Cr
(d) 18% Ni, 8% Mn
(a) 18% Cr, 8% Ni
very common stainless steel
1% C-Chromium steel is noted for its high hardness and wear resistance. It is most suitable for making…?
(a) crankshaft
(b) spanner
(c) ball bearing
(d) gear
ball bearing.
- say which one is which one
(a) crankshaft
(b) spanner
(c) ball bearing
(d) gear
Plain carbon steel suffers a loss of hardness at high temperature. The addition of this alloying element will make the steel retain its hardness at elevated temperature.
(a) Manganese
(b) Tungsten
(c) Nickel
(d) Silicon
