RE: [MW:23719] Impact test- minimum thk requirement

Hi DV George

The charpy requirements starts from 5 mm and above. Below 5 mm is not required as per ASTM A370  which is Standard Test Methods and Definitions for Mechanical Testing of Steel Products page 5 Note 7 2003 publication.  

On the other hand example 5 section 7 in EEMUA 153 which is SUPPLEMENT TO ASME B31.3 states as follows: 

"""""7 BS 3603, Charpy V-notch impact testing at low temperature BS 3603 : 1991 Sec. 12.2.3 states that impact testing shall not be carried out on tubes less than 6 mm thick. For the particular example in which a nominal wall thickness of 5.6 mm is specified, impact testing will not be carried out. However impact values may be assumed as those given for thicker material supplied to the same specification. """"" 

Also most of project specifications don't require charpy test below 6 mm.  Hence, in your case the impact test is not required. I think this clarifies your doubt.  

Best regards Elshan.

________________________________
> Date: Thu, 15 Oct 2015 12:11:43 +0400
> Subject: Re: [MW:23717] Impact test- minimum thk requirement
> From: harishkannepalli@gmail.com
> To: materials-welding@googlegroups.com
>
> For this diameter and thickness, it is not possible to perform impact test.
>
> 2013-05-22 14:33 GMT+04:00 victor george
> <dvgeorge@gmail.com<mailto:dvgeorge@gmail.com>>:
> Hi Experts,
>
> Please explain what is the minimum thickness requirement of impact test.
>
> Material: A790 S31803 pipe
> Size: 1/2' Sch 80 (WT- 3.73mm)
> Sour service
>
>
> Question: Is it possible to do impact test on 3.73 thk?
>
>
> Best Regards,
> DV.George
>
>
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