The requirement for ASTM A217 Gr. WC9 castings for valves components like Body and Bonnet were Normalising at 920+/- 20 Deg. C and Tempring 780+/- 20 Deg. C
The specification calls furnace shall be calibtated within +/-14 deg. C
The Heat Chart shows minimum temperature for normalising 900 to 920 Deg. C, but maximum temperature 960-990 Deg. C
Tempering 780+/-20 Deg. C is within limits and accepted.
Casting having integral test bars, heat trated along with castings passed in chemical znalysis and mechanical properties.
Since normalising maximum temperature is not meeting specification, where castings can be salvaged or renormalised and retempered to meet specification. Whether it will have affect on remechanical properties testing
No Answer is Posted For this Question
Be the First to Post Answer
does any one has gate solutions of 2007,08,09 metallurgical engg papers?
What is carbide?
Is brass magnetic?
What is the melting point of e70 steel, 304,308,316 stainless steels? In addition, what is the hottest part of the flame in a fire?
For the same part, it is possible to Specify the two different type of Hardness with same scall(EX-Quenching and tempering==>450 to 500HV30 & Hardening and Austempering 330- 380HV30)
What special precautions need to be employed if a powder metallurgy route is chosen?
The stress concentration is caused due to ?
Why are the superalloys sometimes subjected to secondary melting processes?
Isn't power metallurgy an expensive processing route to employ?
Why is chromium molybdenum steels used to build pressure vessels? Define what is special about the properties of chromium molybdenum steels that make them ideal for pressure vessels?
what is the hardness of ohns before heat treatment process and hardness of en series before heat treatment process
what is the different between ferrite percentage and ferrite number?