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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Define what is the melting point of e70 steel, 304,308,316 stainless steels? In addition, define what is the hottest part of the flame in a fire?

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Define knurling.

0 Answers   Essar,

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When might secondary melting processes be unnecessary?

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Define what kind of cleaning substance or treatments keep or help prevent cast iron from rusting?

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Define what is the strongest metal?

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Why is steel vital in the construction of an aircraft?

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Isn't power metallurgy an expensive processing route to employ?

2 Answers   JSW, TATA,

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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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What affect would increasing the charpy impact toughness on an object have on the surface of an object it strikes if all else remains the same? Would it cause moredamage to the object it strikes?

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Explain the purpose of riser?

0 Answers   NIC,

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what is the composition of grey cast iron grade 20?

2 Answers  

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