In which type of casting, the outer surface is made hard while the inner surface remains relatively soft?(a) Hollow casting(b) Sand casting(c) Chilled casting(d) Die castingThis question was addressed to me during an online interview.My doubt stems from Ferrous Metals topic in chapter Air Conditioning, Thermal Insulation, Stones & Ferrous Metals of Construction & Building Materials

In which type of casting, the outer surface is made hard while the inn

1.	In which type of casting, the outer surface is made hard while the inner surface remains relatively soft?(a) Hollow casting(b) Sand casting(c) Chilled casting(d) Die castingThis question was addressed to me during an online interview.My doubt stems from Ferrous Metals topic in chapter Air Conditioning, Thermal Insulation, Stones & Ferrous Metals of Construction & Building Materials
Answer» Right option is (c) Chilled casting To EXPLAIN I WOULD say: In chilled casting, the outer surface is made hard while the inner surface remains relatively soft. SUDDEN cooling or chilling makes the outer surface hard. Chilled casting is used for PRODUCING wearing surface as in case of tyres.

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