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

0 Answers   Leader Valves,

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Is it possible to determine the heat treatment condition in stainless steel (astm a 479 gr xm-19) by checking the microstructure?

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Why cutting fluid is used in machining?

0 Answers   NIC,

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What is the critical speed of shaft?

0 Answers   Essar,

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What is the Equivalent for 9.81 kgf= ?

0 Answers   NIC,

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You are required to calculate a heat affected zone in weld. How would you do that?

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Why is chromium molybdenum steels used to build pressure vessels?

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Why do some of the latest 'single crystal' superalloys contain concentrations of the grain boundary strengthening elements, e.g. carbon and boron?

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what is meant by hardening ability of metals?

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What are the characteristics of the thermodynamic stage of a metal?

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What do you do with the super alloys in the present working culture so as to improve the technology for general people?

2 Answers   Magnum,

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Explain the uses of iron ferrite?

0 Answers  

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