A.50 Rockwell ‘C’
B.66 – 67 Rockwell ‘C’
C.100 – 150 Rockwell ‘C’
D.80-85 Rockwell ‘C’
E.There is no such limit for hardness
Related Mcqs:
- Which of the following hardness tester can be used to determine the hardness of a glass sheet?
- In plain carbon steel as the percentage of carbon increases from 0.2% to 0.8% which of the following decreases?
- The hardness of martensite in quenched plain carbon steels reaches almost a saturation value of carbon of about
- C-14 steel indicates plain carbon steel containing carbon percentage
- When piece of 0.2% carbon steel is heated above third critical point the steel is a solid solution of carbon in gamma iron and called
- A steel specimen is heated to 730?C and cooled at the slowest possible rate in the furnace. Which property will be imparted to the steel piece?
- A steel piece after hardening is heated to 300?C and then cooled in oil. The property imparted to the steel piece will be
- The fastest cooling rate is achieved when steel is quenched in
- The slowest cooling rate is achieved when steel is quenched in
- In order to observe the grain size of steel samples under microscope, the magnification should be the order of
