Whether CVN test is required or not – and also the criterions – are very much dependent on the design code being applied.
Is design code Eurocode 3 (EN 1993-series standards)?
If so, you will see in the design code that CVN will normally not be required for Concequence Class (CC), CC1.
For consequence class CC2 and CC3 you can see the charpy impact test requirements for each EN 10025 steel quality in EN 1993-1-10.
It is dependent on following parameters:
a) Your minimum design temperature
b) The maximum thickness of the relevant steel quality
c) The utilization in the design
regards
Kristian
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of arvinda shan
Sent: 11. september 2011 05:28
To: materials-welding@googlegroups.com
Subject: Re: [MW:12416] Impact test requirement for JO and JR grades in structural fabrication.
Dear all,
Thanks for your valuable suggestions.
Contractor insists CVN is applicable only beyond 100mm thickness for structural as per BS EN 10025-2 table 9 option 28. I'm not satisfied with that. In company specification, nowhere specified about impact. In company document, materials shall be as per BS EN 10025.
As per BS EN 10025-1 , CVN is required more than 6mm of nominal thickness.
My question is If they don't need CVN, why they are using such materials ? Also my recommendation is also CVN required for Jo and Jr grades. Any criteria based on thickness? .
Any reference plz. clarify.
Arvinda
On Sat, Sep 10, 2011 at 7:15 PM, Harish Kannepalli <harishkannepalli@gmail.com> wrote:
Impact test is mandatory for t>6mm, if the material is going for low temperature service.
2011/9/10 arvinda shan <arvindashan@gmail.com>
Dear Experts,
For crosshead installation in jetty project, the following materials (37mm) are used.
Road way - S355JO
Crosshead - S355JR & S275JR
Pipe track - S355JR
As per European structural steel standard EN10025 , for JR grade, Longitudinal charpy V-notch impacts 27J @20 degrees and for JO grade, Longitudinal charpy V-notch impacts 27J @ 0 degrees.
We received materials mill certificates w/o impact test.
My question is whether impact is mandatory for above grades or any criteria of thickness as per EN10025? Please mention with reference codes.
Your valuable suggestions are appreciated.
Regards
arvinda
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regards,
Harish.
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