What is a boring tool ?

0 Answers   Essar,

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

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How do you classify shapers?

0 Answers   Essar,

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Is it possible to design heat treatment processes such that a gradient in grain size is produced?

4 Answers  

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i want to go to US for Bachlore of computer science, I didn't appeared for SAT. my ielts scores are too low only 5.5 band and I am confused if VISA OFFICERS will ask why u hadn't given SAT. what i have to answer pl suggest?

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Explain heat treatment of brass?

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any input on how to spec out(if possible) a larger grain structure(3/8" or larger) on a Al 6061 forging material.

0 Answers   Novellus,

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Does case harden steel properties detoriates over time? Especially for guns, parts like bolt carrier, the brand new parts has been kept for 10 year and properly oiled. I am worried about its surface hardness to take the blow during firing.

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I currently use 17-7 PH stainless which is hardened to condition CH after forming. raw matl is .1.75"X .12" X .008". Its main usage after hardening is silicon wafer retainer where it's contantly cycled up and down to putin and remove wafer after 40-60 sec process at 400C temp. At this high temperature this part seemed to deform after a a couple of hundred wafer which is what it was designed for in the first place. THere is a proposal to go to a different material to increase lifeline of this part. My question is..... can 321 SST be a plugin replacement. I know this has a higher temp rating but how about its forming characteristics, will it have spring properties, and wont become brittle after prolonged exposure to 400C.

0 Answers   Novellus,

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Why same casting has different hardness and machineability properties? One spot it is found hard for machining and another spot soft? It is FG 260 grade for Cast Iron.

4 Answers  

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what is special about the properties of chromium molybdenum steels that make them ideal for pressure vessels?

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Differentiate between 304 and 316 grades of steel?

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