Bissoy.com
Doctors Medicines MCQs Q&A

What is the temperature needed for preheating in cast irons?

What is the temperature needed for preheating in cast irons? Correct Answer 600°C

Cast irons, upon the removal of welding heat, get solidified very quickly. This solidification takes place due to the surrounding cold mass and the air around. Because of such quick cooling, the carbon gets retained and hard metal stays in the weld. To overcome this, cast irons have to be preheated to 600°C.

Related Questions

Which of the following statements regarding the ‘casting vote’ in the Parliament is/are correct ? 1. It is cast by the speaker or a person acting as such. 2. It is cast in addition to voting in the first instance. 3. It is cast in the case of equality of votes. 4. It is always cast to maintain the status quo. Select the correct answer using the code given below:
What is the composition of high-silicon cast iron named Durichlor that has the highest corrosion resistance among cast irons?
What is the amount of sea coal needed in cast irons for small casting moulding sands?
What is the amount of sea coal needed in cast irons for large green casting moulding sands?
Match List-I with List-II and select the correct answer using the code given below the Lists: List I (Low-Latitude Climate) List I (Characteristic) A. Wet Equatorial 1. Uniform temperatures, mean near 27°C  B. Monsoon and trade wind coastal 2. Marked temperature cycle with very high temperature before the rainy season C. Wet-dry tropical  3. Temperatures show an annual cycle with a high temperature in the high-Sun season Strong temperature cycle. with intense temperature during the high-Sun season  D. Dry tropical 4. Strong temperature cycle, with intense temperature during the high-Sun season
If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that
In an election, 10% of voters do not cast their votes. Out of the total cast votes, 450 becomes invalid. 55% of total valid votes are secured by A and the remaining votes are secured by B. A wins the election by 450 votes. Find the number of voters who did not cast their votes.
In an election between three candidates, 10% of the voters did not cast their votes and 10% of the votes cast were declared invalid. The ratio of votes polled to all the candidates is 5 : 9 : 13. If the number of votes that are not cast is 320, then what is the difference between candidate gets maximum numbers of votes to the candidate get minimum numbers of votes?
In an election between two candidates, 10% of voters did not cast their vote. Out of the cast votes, 3000 votes becomes invalid. If the winner won by 18000 votes which is 28.56% of the total cast votes, then find the number of valid votes.
Malleable cast iron is produced 1. By quick cooling of cast iron. 2. By adding magnesium to molten cast iron. 3. from white cost iron by annealing. Which of the above statements is/are correct?