what is a rate controlling step ? how is it dependent on reaction path ? explain with an example.

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what are the ores of copper?

4 Answers  

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what is the grain size of lead as an element and as an alloy such as lead tin alloy?

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Define what metal cord transfers electricity?

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

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what is meant by hardening ability of metals?

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Upto what negative temperature below zero degree we can use IS 2062 Structural material?

2 Answers  

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What is gold investment casting?

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Why duplex or super duplex stainless steels are welded with low heat input type electrode?

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Where is iron ferite used?

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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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how can make pallet

4 Answers   Qatar Steel,

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