Engineering Materials
Steel contains

50% or more iron
Elements like phosphorus, sulphur and silicon in varying quantities
80% or more iron
Alloying elements like chromium, tungsten nickel and copper

ANSWER DOWNLOAD EXAMIANS APP

Engineering Materials
In a hardening process, the hypo-eutectoid steel is

Heated below or closes to the lower critical temperature and then cooled slowly
Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace

ANSWER DOWNLOAD EXAMIANS APP