For ferrous alloys, the breaking of mould should be done at a temperature_____(a) 780 ⁰C(b) 850 ⁰C(c) above 700 ⁰C(d) below 700 ⁰CThis question was addressed to me in an interview.My doubt is from Casting Cleaning in section Pouring – Gating Design, Melting Furnaces, Melting and Casting Quality of Casting-Forming-Welding I

For ferrous alloys, the breaking of mould should be done at a temperat

1.	For ferrous alloys, the breaking of mould should be done at a temperature_____(a) 780 ⁰C(b) 850 ⁰C(c) above 700 ⁰C(d) below 700 ⁰CThis question was addressed to me in an interview.My doubt is from Casting Cleaning in section Pouring – Gating Design, Melting Furnaces, Melting and Casting Quality of Casting-Forming-Welding I
Answer» CORRECT ANSWER is (d) below 700 ⁰C Explanation: IDEALLY, the moulds should be broken at a temperature when no transformation occurs. For ferrous alloys, the breaking should be done at a temperature below 700 ⁰C. If the castings are fragile and THIN, they should be removed at a temperature as low as 400 ⁰C to avoid any deformation to the metal castings at the TIME of breaking of mould.

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