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Anny
Active Contributor

Join Date: Oct 2013
Posts: 17

Impact Test

11/01/2013 1:50 AM

Impact test is done for materials which fall below UCS-66 curve A,B,C or D(depending on materials). For example, for SA 516 Gr.60 (Normalized), MDMT is -48° C.If the minimum design temp. is colder/lower than -48°C then Impact test is required.

My question is: How will impact test help in this situation? Why should we perform impact test?

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IdeaSmith
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Join Date: Mar 2012
Location: Out of your mind! Not in sight!
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#1

Re: Impact Test

11/01/2013 3:38 AM

Brittleness when cold?

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Anonymous Poster #1
#2

Re: Impact Test

11/01/2013 3:58 AM

Ask cxcxcx0505.
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Anonymous Poster #2
#3

Re: Impact Test

11/01/2013 10:02 AM

Did you ask this question to Mr. Pvelite?
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bigg
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Join Date: Jun 2010
Posts: 1296
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#4

Re: Impact Test

11/01/2013 12:47 PM

The general idea is that if the material fails the impact test requirements for that MDMT, items made from that heat will not be allowed to be used at that temperature. It is an additional requirement to SA 516 Gr 60 for that special case.
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Anonymous Poster #2
#5

Re: Impact Test

11/02/2013 12:37 AM

Rudeness and cursing Not Tolerated on CR4

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Anny
Active Contributor

Join Date: Oct 2013
Posts: 17
#6
In reply to #5

Re: Impact Test

11/02/2013 3:44 AM

Sir

Please note that my question was no where your answer. The impact test is done to check the absorebed energy in the specimen are within ASME code (UG-84) limits. Table UCS-66 (Impact test Exemption Curve) listed materials in this regard. My concern was what is the basis of selecting energy limit by ASME?

And for you, MDMT is the lowest temperature permitted according to the metallurgy of the vessel fabrication materials, that is, according to the low temperature embrittlement range and the charpy impact test requirements per temperature, for each one of the vessel's components

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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
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#7
In reply to #6

Re: Impact Test

11/02/2013 3:53 AM

Don't worry about AP#2, who is not really knowledgeable, nor even humorous.

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Anonymous Poster #2
#9
In reply to #6

Re: Impact Test

11/04/2013 1:19 PM

Shory anny, after the submission only I realiced that my comment was rude and inapprocriate. Moreover, your reply was also gone in 'depth' to explain the 'embrittlamant' of materials at lower tepm. However I have attached an excellent paper and some useful links to quench your thirst.

http://www.ammonia21.com/web/assets/link/T389.pdf

http://www.eng-tips.com/viewthread.cfm?qid=65338

http://www.eng-tips.com/viewthread.cfm?qid=67956

http://www.eng-tips.com/viewthread.cfm?qid=104732

http://www.eng-tips.com/viewthread.cfm?qid=104732

http://www.eng-tips.com/viewthread.cfm?qid=128577

http://www.eng-tips.com/viewthread.cfm?qid=307456

http://pressurevesseltech.asmedigitalcollection.asme.org/article.aspx?articleid=1457033

http://materialstechnology.asmedigitalcollection.asme.org/article.aspx?articleid=1426985
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Baxter
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United States - Member - New Member Hobbies - Automotive Performance - New Member

Join Date: May 2008
Posts: 845
Good Answers: 8
#8

Re: Impact Test

11/04/2013 10:05 AM

Sorry for the rude responses you received in regards to your question Anny. Using the anonymous post feature to be rude to another user is very annoying and abuses the feature. I hope you get the answers / help you are looking for.
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Users who posted comments:

Anny (1); Anonymous Poster (4); Baxter (1); bigg (1); IdeaSmith (1); Tornado (1)

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