In low carbon steels, presence of small quantities of sulphur improves

A Weldability
B Formability
C Machinability
D Hardenability

Correct Answer: Machinability

Sulfur is normally regarded as an impurity and has an adverse effect on impact properties when a steel is high in sulphur and low in manganese.
Sulphur improves machinability but lowers transverse ductility and notched impact toughness and has little effects on the longitudinal mechanical properties.
Bissoy MCQ
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Related Questions

Presence of small quantity of sulphur in low carbon steel improves its
A Formability
B Machinability
C Weldability
D Hardenarality
In low carbon steels, ________ raises the yield point and improves the resistance to atmospheric corrosion.
A Sulphur
B Phosphorus
C Manganese
D Silicon
The addition of lead, sulphur and phosphorus to low carbon steels, help to
A Reduce built up edge
B Break up chips
C Improve machinability
D All of these
Steels with high carbon equivalent have poor weldability, because in these steels during welding
A Carbon and other alloying elements get oxidised from the weld pool
B Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld
C Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld
D Segregation of carbon and other element occurs in the weld pool leading to poor properties of the weld
Low carbon steels are those in which carbon percentage is around
A 0.1 to 0.35
B 0.4 to 0.7
C 0.8 to 1.5
D 1.5 to 2
In each of the questions 20-21 , there are two quantities : Quantity A and Quantity B. You are to compare those quantities . Quantities A 5 (a-7) Quantity B 5a - 7
A Quantity A is greater
B Quantity B is greater
C Both quantities are equal
D It is impossible to determine
The process which improves the machinability of steels, but lowers the hardness and tensile strength is
A Normalising
B Full annealing
C Process annealing
D Spheroidising
Maximum sulphur percentage in low sulphur heavy stock (LSHS) furnace oil is about
A 0.1
B 1
C 2.5
D 3.5
For hardening alloy steels and high speed steels, they are heated to
A 1100 to 1300°C
B 1300 to 1500°C
C 500 to 600°C
D 700 to 900°C
'Killed steels' are those steels
A Which are destroyed by burning
B Which after their destruction are recycled to produce fresh steel
C Which are deoxidized in the ladle with silicon and aluminium
D In which carbon is completely burnt

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