what is the difference beteeen Annealing and stress
releaving
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Answer Posted / arnab bakshi
Annealing is done to soften the material for Machining and
core refining. Where as Stress Releiving carried out to
remove stresses from Febrication Body, Casting Components
for Weather distortion, Heavy Maching stresses for avoiding
distortion in Hardning process without decreasing the
hardness of the material.
Annealing(full) is usually carried out at temperatures
above Ac3, whereas Stress relieving is generally a
subcritical process.
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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
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