Ductile cast iron is
Explanation: Ductile cast iron, also called as nodular cast iron or spheroidal cast iron consists of carbon in the form of spherical nodules in a ductile matrix.
Grey Cast iron is formed when
Explanation: Grey Cast iron is formed only when carbon is present exceeds the solving capacity.
White cast iron is formed when
Explanation :White cast iron is formed when most carbon in alloy forms iron carbide and there are no graphite flakes.
The term high alloy steels is used for alloy steels containing more than ___ of alloying elements.
Explanation: The term high alloy steels is used when alloying elements exceed 10%.Low and medium alloy steels are those when this figure is less than 10%.
Which of the following are true about low carbon steels?
Explanation: Low carbon steels contain carbon <0.3%. Because of low carbon, it is soft and ductile.
Which of the following are true for high carbon steels?
Explanation: High carbon steel have carbon % >0.5 and hence have less ductility. They are difficult to weld.
Which of the following are true?
Explanation: The number before “C” indicates measure of carbon. Hence a) is true as higher the carbon, lower the ductility.
In the designation “xCb” which of the following are true?
Explanation: X indicates 100 times carbon % and b indicates 10 times manganese %.
Which of the steel in given options is best suited for auto mobile bodies and hoods?
Explanation: For automobile application like manufacturing bodies, ductile material is preferred.
Which of the following steel given in options respond fastest and easily to heat treatment?
Explanation: Alloys with higher carbon % respond willingly to heat treatment.